物理化学学报最新文献

{"title":"High-precision and reliable thermal conductivity measurement for graphene films based on an improved steady-state electric heating method","authors":"Jiahao Lu ,&nbsp;Xin Ming ,&nbsp;Yingjun Liu ,&nbsp;Yuanyuan Hao ,&nbsp;Peijuan Zhang ,&nbsp;Songhan Shi ,&nbsp;Yi Mao ,&nbsp;Yue Yu ,&nbsp;Shengying Cai ,&nbsp;Zhen Xu ,&nbsp;Chao Gao","doi":"10.1016/j.actphy.2025.100045","DOIUrl":"10.1016/j.actphy.2025.100045","url":null,"abstract":"<div><div>The graphene film with high thermal conductivity has garnered considerable attention in recent years as an ideal material for dissipating heat in high-power electronic devices. Thermal conductivity is a crucial parameter for evaluating its fundamental performance. High-precision measurement holds significant importance for understanding its basic properties, fabrication optimization, and industrial applications. However, it is difficult to simultaneously achieve efficient, accurate, and reliable measurements with existing commercial thermal conductivity testing methods. The development of a convenient, high-precision, and reliable measurement approach remains a great challenge. Here, we introduce a thermal conductivity testing methodology with superior accuracy and excellent efficiency based on an improved steady-state electric heating method, refined through the optimization of heat transfer principles, experimental operation, and data analysis, supported by finite element simulation. The accuracy of measurements is affected by four factors: heat loss calibration, sample size, device design, and data treatment. The experimental results show that the heat loss caused by heat radiation and heat convection affects the temperature distribution and the measurements of the sample, which should be strictly controlled by sample size and temperature rise. Reasonable screening and preprocessing of data are also necessary to improve measurement accuracy. Through the comparative analysis of the temperature distribution and thermal conductivity measurements of samples under different conditions, we propose feasible operational guidance and a standardized testing protocol to minimize measurement error. The measurement error is less than 3.0%, and uncertainty is reduced to 0.5%. Simulation results confirm that the response time of this method is down to milliseconds, correlating well with the experiment, which can effectively improve test efficiency. Considering the combined merits of high accuracy, repeatability, and fast response, the improved steady-state electric heating method offers useful guidance for the accurate evaluation of the thermal conductivity of materials and crucial technical support for research and application in thermal management.</div></div>","PeriodicalId":6964,"journal":{"name":"物理化学学报","volume":"41 5","pages":"Article 100045"},"PeriodicalIF":10.8,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “Mechanistic insights into water-mediated CO2 electrochemical reduction reactions on Cu@C2N catalysts: A Theoretical study” [Acta Physico-Chimica Sinica (2024) 40, 2303040]","authors":"Hanyu Xu ,&nbsp;Xuedan Song ,&nbsp;Qing Zhang ,&nbsp;Chang Yu ,&nbsp;Jieshan Qiu","doi":"10.1016/j.actphy.2024.100043","DOIUrl":"10.1016/j.actphy.2024.100043","url":null,"abstract":"","PeriodicalId":6964,"journal":{"name":"物理化学学报","volume":"41 5","pages":"Article 100043"},"PeriodicalIF":10.8,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance and electrochemical asymmetry optimization of hydrogen electrode supported reversible solid oxide cell","authors":"Qianwen Han,&nbsp;Tenglong Zhu,&nbsp;Qiuqiu Lyu,&nbsp;Mahong Yu,&nbsp;Qin Zhong","doi":"10.3866/PKU.WHXB202309037","DOIUrl":"10.3866/PKU.WHXB202309037","url":null,"abstract":"<div><div>Solid oxide cell (SOC) is a typical multi-layer thin film ceramic device consisting of oxygen electrodes, electrolytes, and hydrogen electrodes. The currently widely used structure is a single cell supported by a Ni-YSZ (Nickel-Yttria Stabilized Zirconia) hydrogen electrode, with YSZ (Yttria Stabilized Zirconia) serving as the electrolyte. This configuration achieves electrolyte filmization, while also reducing the operating temperature of the cell. However, it introduces significant diffusion resistance within the hydrogen electrode, which is considered the main reason for the electrochemical asymmetry in reversible solid oxide cell (R–SOC). This study prepared hydrogen electrodes with varying porosity and investigated the impact of diffusion resistance of hydrogen electrodes on R–SOC asymmetry. On this basis, <em>in-situ</em> hydrothermal growth technology was employed to prepare ultra-thin and dense GDC (Gd₂O₃ doped CeO₂) barrier layers, compared with conventional screen-printed barrier layers to explore the effect of electrolyte ohmic resistance on electrochemical asymmetry. Experimental findings revealed that the electrolyte ohmic resistance is also a significant factor affecting the electrochemical asymmetry of reversible SOC, and the synergistic mechanism of the diffusion resistance of hydrogen electrodes and the ohmic resistance of thin film electrolytes on this asymmetry was elucidated. The experimental results show that increasing the hydrogen electrode porosity and reducing the electrolyte ohmic resistance can both enhance the R–SOC performance, particularly improving SOEC electrolysis performance, and both have the effect of reducing asymmetry. At 750 °C, 50 % H₂O, and ±0.3 V bias conditions, the single cell with a large-pore hydrogen electrode and a thin film barrier layer exhibited a discharge current density of 0.752 A cm⁻² and an electrolysis current density of 0.635 A cm⁻². Compared to the single cell with a small pore hydrogen electrode and an ordinary screen-printed barrier layer, the discharge and electrolysis performance of the cell have been improved by ∼37 % and ∼140 %, respectively. At the same time, the current density asymmetry of the cell (Δ<em>j</em>) under these conditions was only 0.117 A cm⁻², reduced by 58 % compared to a small porosity hydrogen electrode single cell and 24 % compared to a large ohmic resistance single cell. In addition, the study noted that R–SOC asymmetry increases with operating temperature and decreases with higher steam content in the fuel on the hydrogen electrode side. These findings hold significant reference value the design, preparation, and reversible operation of high-performance hydrogen electrode supported thin film electrolyte SOC single cell structures.</div></div>","PeriodicalId":6964,"journal":{"name":"物理化学学报","volume":"41 1","pages":"Article 100005"},"PeriodicalIF":10.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Catalytic effect of H3PW12O40 on hydrogen storage of MgH2","authors":"Ran Yu ,&nbsp;Chen Hu ,&nbsp;Ruili Guo ,&nbsp;Ruonan Liu ,&nbsp;Lixing Xia ,&nbsp;Cenyu Yang ,&nbsp;Jianglan Shui","doi":"10.3866/PKU.WHXB202308032","DOIUrl":"10.3866/PKU.WHXB202308032","url":null,"abstract":"<div><div>Developing hydrogen energy to replace carbon-rich fossil fuels is the future direction of energy technology, but there is still a lack of safe and efficient hydrogen storage technology. Hydrogen storage in solid medium is a relatively safe way to store hydrogen, among which magnesium hydride (MgH₂) is one of the most promising solid hydrogen storage materials. MgH₂ has the advantages of high hydrogen storage density, low cost and good reversibility of hydrogen absorption and release. However, improving its poor thermodynamic and slow kinetic characteristics are still challenging. Catalysts derived from polyoxometalates have been successfully used for catalyzing hydrogen evolution reaction, oxidation of organic compounds, desulfurization reaction, and so on. However, these catalysts have not been applied to the hydrogen storage materials yet. In this paper, H₃PW₁₂O₄₀ is selected as a representative of polyoxometalates and its catalytic effect on hydrogen storage is studied. MgH₂-<em>x</em>H₃PW₁₂O₄₀ (<em>x</em> ​= ​7 ​%, 10 ​%, 13 ​%, mass percentage) and pure MgH₂ samples are prepared by mechanical ball milling method. Among them, MgH₂-10H₃PW₁₂O₄₀ exhibits the optimal performance in both kinetic characteristic and hydrogen storage capacity. It can rapidly absorb 6.25 ​% hydrogen within 1 ​min at 250 ​°C and release 6.54 ​% hydrogen within 15 ​min at 300 ​°C, while ball-milled MgH₂ only releases 1.2 ​% hydrogen within 30 ​min at 300 ​°C. At the same time, the activation energy of the composite decreases to 106.08 ​kJ ​mol⁻¹, which is 46.23 ​kJ ​mol⁻¹ lower than MgH₂. The catalytic effect of H₃PW₁₂O₄₀ on the hydrogen storage properties of MgH₂ mainly comes from three aspects. Firstly, the addition of H₃PW₁₂O₄₀ helps to avoid the agglomeration of MgH₂ during the ball milling process, which makes the MgH₂ particles become smaller after ball milling, thus increasing the specific surface area of the interaction with hydrogen. Secondly, the addition of H₃PW₁₂O₄₀ makes MgH₂ produce a large number of defects and lattice distortion during ball milling, which provides more channels for hydrogen diffusion. Thirdly, the catalytic components of WO₃ and W are <em>in situ</em> formed during the ball milling process. They can be used as active components to accelerate the electron migration process, which promotes the cleavage of the Mg―H bond and the adsorption and dissociation of hydrogen.</div></div>","PeriodicalId":6964,"journal":{"name":"物理化学学报","volume":"41 1","pages":"Article 100001"},"PeriodicalIF":10.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-stable aqueous zinc metal anodes enabled by an oriented ZnQ zeolite protective layer with facile ion migration kinetics","authors":"Shanghua Li ,&nbsp;Malin Li ,&nbsp;Xiwen Chi ,&nbsp;Xin Yin ,&nbsp;Zhaodi Luo ,&nbsp;Jihong Yu","doi":"10.3866/PKU.WHXB202309003","DOIUrl":"10.3866/PKU.WHXB202309003","url":null,"abstract":"<div><div>Aqueous zinc ion batteries (ZIBs) are regarded as one of the most promising energy storage systems due to their reliable safety, low cost, high volumetric capacity, and environmental friendliness. However, the utilization of Zn metal anode in aqueous electrolyte commonly encounters complex water-induced side reactions and uncontrollable dendrite growth issues. Constructing a protective layer on the surface of Zn anode is an effective strategy to alleviate side reactions and dendrite growth, achieving the stable operation of ZIBs with prolonged cycling life. However, the utilization of protective layers will increase interfacial resistance and result in high polarization in most cases. Thus, developing a desirable artificial protective layer with high ion migration kinetics is a significant task, enabling a fast Zn²⁺ ion flux for homogeneous deposition with low polarization. Considering that porous aluminosilicate zeolite with a low Si/Al ratio can accommodate abundant framework-associated cations as charge carriers for conduction, herein, we prepared an oriented protective layer on the Zn anode using Zn-ion-exchanged Q zeolite with <strong>BPH</strong> topology (ZnQ@Zn), achieving a stable Zn anode with high ion migration kinetics. The ZnQ zeolite plates parallelly lay on the surface of Zn foil with the <em>c</em> axis normal to the substrate plane. The three-dimensional ordered channels and the oriented arrangement of ZnQ zeolite plates provide facile ion migration pathways for Zn²⁺ ions, and the coordination of framework-associated Zn²⁺ ions with water in zeolite channels also enables fast ion conduction kinetics and high corrosion resistance. Therefore, ZnQ@Zn exhibits enhanced ion conduction kinetics with reduced energy barriers for desolvation, charge transfer, and diffusion processes, resulting in a uniform ion flux to suppress dendrite growth. Consequently, the ZnQ@Zn symmetric cell displays an ultra-low voltage hysteresis of 27 ​mV with a long lifespan of over 1100 ​h at 1 ​mA ​cm⁻² and 1 ​mAh ​cm⁻². Moreover, the ZnQ@Zn//NaV₃O₈·1.5H₂O full cell delivers a superior long-term cycling performance with a high capacity retention of 96% after 1800 cycles at 8 ​A ​g⁻¹. This work provides a new sight for constructing protective layers with fast ion migration kinetics to achieve high-stable Zn anodes, and extends the application of zeolite-based ion-conductive materials in energy storage devices.</div></div>","PeriodicalId":6964,"journal":{"name":"物理化学学报","volume":"41 1","pages":"Article 100003"},"PeriodicalIF":10.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Atomically precise (AgPd)27 nanoclusters for nitrate electroreduction to NH3: Modulating the metal core by a ligand induced strategy","authors":"Lubing Qin ,&nbsp;Fang Sun ,&nbsp;Meiyin Li ,&nbsp;Hao Fan ,&nbsp;Likai Wang ,&nbsp;Qing Tang ,&nbsp;Chundong Wang ,&nbsp;Zhenghua Tang","doi":"10.3866/PKU.WHXB202403008","DOIUrl":"10.3866/PKU.WHXB202403008","url":null,"abstract":"<div><div>Electrochemical nitrate reduction reaction (eNO₃^–RR) to synthesize NH₃ is a sustainable method to convert environmental contaminants into valuables. Pd based bimetallic nanocatalysts have demonstrated great promise as efficient catalysts, yet modulating the composition and configuration to improve the catalytic performance and achieve comprehensive mechanistic understanding remains challenging. Herein, by employing two ligands with different electron functional groups, we successfully prepared two atomically precise (AgPd)₂₇ bimetallic clusters of Ag₁₈Pd₉(C₈H₄F)₂₄ (Ag₁₈Pd₉) and Ag₂₂Pd₅(C₉H₁₀O₂)₂₆ (Ag₂₂Pd₅). The two clusters possess markedly different metal core composition and configuration, where Ag₁₈Pd₉ has a sandwich metal core structure with 9 Pd atoms located in the middle layer and Ag₂₂Pd₅ has a rod-shaped metal core structure composed of the M₁₃ configuration with 5 Pd atoms located at the center and vertices of the M₁₃ configuration. Unexpectedly, Ag₂₂Pd₅ exhibited remarkably superior eNO⁻₃RR performance than Ag₁₈Pd₉. Specifically, the highest Faradaic efficiency of NH₃ (FE_NH3) and its yield rate can reach 94.42 % and 1.41 mmol h⁻¹ mg⁻¹ at −0.6 V <em>vs</em>. RHE for Ag₂₂Pd₅, but the largest FE_NH3 and NH₃ yield rate is only 43.86 % and 0.41 mmol h⁻¹ mg⁻¹ at −0.5 V <em>vs</em>. RHE for Ag₁₈Pd₉. The <em>in situ</em> attenuated total reflection surface enhanced infrared absorption spectroscopy (ATR-SEIRAS) test provides the experimental evidence of the reaction intermediates hence revealing the reaction pathway, also shows that Ag₂₂Pd₅ has stronger capability for NO⁻₃ adsorption and NH₃ desorption than that of Ag₁₈Pd₉. Theoretical calculations indicate that the de-ligated clusters can expose the available AgPd bimetallic sites, synergistically serving as effective active sites and the different configurations result in significantly different catalytic activities, where the active sites in Ag₂₂Pd₅ are more favorable for NO⁻₃ adsorption and NH₃ desorption to accelerate the catalytic process.</div></div>","PeriodicalId":6964,"journal":{"name":"物理化学学报","volume":"41 1","pages":"Article 100008"},"PeriodicalIF":10.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sulfide solid electrolyte synthesized by liquid phase approach and application in all-solid-state lithium batteries","authors":"Mingyang Men ,&nbsp;Jinghua Wu ,&nbsp;Gaozhan Liu ,&nbsp;Jing Zhang ,&nbsp;Nini Zhang ,&nbsp;Xiayin Yao","doi":"10.3866/PKU.WHXB202309019","DOIUrl":"10.3866/PKU.WHXB202309019","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Current commercialized lithium-ion batteries generally suffer from safety issues due to using flammable organic liquid electrolytes. All-solid-state lithium batteries employing solid electrolytes instead of organic liquid electrolytes and separators possess the advantages of both good safety and high energy density, which are expected to be the most promising energy storage devices for the next generation electric vehicles and smart grid. Sulfide solid electrolytes are regarded as crucial components for all-solid-state rechargeable batteries for the merits of their high room temperature ionic conductivities that approach or exceed liquid organic electrolytes and excellent mechanical ductility. The preparation methods of sulfide solid electrolytes are mainly divided into three categories, &lt;em&gt;i.e.&lt;/em&gt; solid-state sintering, ball milling and liquid-phase method. However, solid-state sintering and ball milling are time-consuming accompanied by high energy consumption. At the same time, the synthesized electrolyte particles are large in size, which seriously limits the practical application of sulfide solid electrolytes. In contrast, the liquid-phase method, using organic solvents as the medium, can synthesize sulfide solid electrolytes with controlled particle sizes, which is a simple and time-saving process and more suitable for large-scale production. In this review, we begin by introducing the crystal structures and ion transport mechanisms of major sulfide solid electrolytes including Li&lt;sub&gt;2&lt;/sub&gt;S–P&lt;sub&gt;2&lt;/sub&gt;S&lt;sub&gt;5&lt;/sub&gt; binary sulfide solid electrolytes, Li&lt;sub&gt;10&lt;/sub&gt;GeP&lt;sub&gt;2&lt;/sub&gt;S&lt;sub&gt;12&lt;/sub&gt; and Li&lt;sub&gt;6&lt;/sub&gt;PS&lt;sub&gt;5&lt;/sub&gt;X (X ​= ​Cl, Br, I) ternary systems, and summarize the progress of sulfide solid electrolytes prepared by liquid phase method in recent years. Based on the solubility state of the reagents in the solvent, the liquid-phase synthesis of sulfide solid electrolytes can be categorized into suspension type, solution type and mixed type, and their reaction mechanisms are discussed separately. Subsequently, we summarize the effect of solvents on the properties of liquid-phase synthesized sulfide solid electrolytes, such as purity, morphology, crystallinity and ionic conductivity. In addition, the application of liquid-phase synthesized sulfide solid electrolytes for all-solid-state lithium batteries is presented from six aspects: sulfide solid electrolytes coated on active materials, electrolyte-active material composites, electrolyte injection into porous electrodes, interfacial modification at solid-solid contact triple-interfaces within electrode layers, electrolyte elemental doping and electrolyte film preparation, which demonstrates the superior scalability of the liquid-phase method and the diverse application prospects. Finally, according to the current research status of the sulfide solid electrolytes synthesized by liquid phase method, the advantages and limitations of the liquid phase synthesis of su","PeriodicalId":6964,"journal":{"name":"物理化学学报","volume":"41 1","pages":"Article 100004"},"PeriodicalIF":10.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nucleation regulation and mechanism of precursors for nickel cobalt manganese-based cathode materials in lithium-ion batteries","authors":"Jiaxuan Zuo ,&nbsp;Kun Zhang ,&nbsp;Jing Wang ,&nbsp;Xifei Li","doi":"10.3866/PKU.WHXB202404042","DOIUrl":"10.3866/PKU.WHXB202404042","url":null,"abstract":"<div><div>Nickel cobalt manganese-based cathode materials (NCMs) have emerged as key representatives in lithium-ion power batteries due to their high energy and power densities. The layered crystal structure of NCMs undergoes topological transformation from hydroxide precursor materials crystals. Therefore, the electrochemical performance of NCMs is directly influenced by factors such as particle size distribution, sphericity, and morphology of primary and secondary particles of precursor materials. The co-precipitation method is widely employed in laboratory and industry to produce batch precursor materials with uniform composition, adjustable structure, and high tap density. However, the co-precipitation process involves numerous adjustable parameters, and there exist significant variations in the growth parameters of precursors with different compositions and even different particle sizes within the same composition, resulting in poor characteristics such as bad sphericity, poor crystallinity, and low tap density. Addressing the need for controlled co-precipitation of nickel cobalt manganese-based precursors, this review began with an exposition on the basic theory of co-precipitation, elaborating on the principle of regulating precipitation rate and uniformity of Ni–Co–Mn elements through complexation. The heterogeneous nucleation (growth), homogeneous nucleation (independent nucleation), and the coexistence of two nucleation modes induced by different supersaturation of precipitates were explained according to different nucleation dominant modes. The growth theory of hexagonal nanosheet and rod-shaped primary particles was introduced from the perspective of preferential growth, while analyzing the growth pattern of secondary particle aggregates in terms of minimizing surface energy and following dissolving-recrystallization. From the viewpoint of practical production and application, this study comprehensively investigated adjustable parameters of the co-precipitation reaction process, including pH value, total ammonia concentration, solid content, reaction time, reaction temperature, base solution volume, stirring rate, tank reactor structure, aging time, reaction atmosphere, and drying atmosphere. The impact of varying each parameter from low to high on the nucleation of the co-precipitation reaction process and the physicochemical properties of precursors was extensively discussed. This systematic review contributes to a deeper understanding of the precursor nucleation process, facilitating the further development of relevant theories towards the advancement of products such as lithium-rich manganese-based precursors, single crystal precursors, and radially arranged texture precursors.</div></div>","PeriodicalId":6964,"journal":{"name":"物理化学学报","volume":"41 1","pages":"Article 100009"},"PeriodicalIF":10.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of interlayer anions in layered double hydroxides on the photothermocatalytic CO2 methanation of derived Ni–Al2O3 catalysts","authors":"Lina Guo ,&nbsp;Ruizhe Li ,&nbsp;Chuang Sun ,&nbsp;Xiaoli Luo ,&nbsp;Yiqiu Shi ,&nbsp;Hong Yuan ,&nbsp;Shuxin Ouyang ,&nbsp;Tierui Zhang","doi":"10.3866/PKU.WHXB202309002","DOIUrl":"10.3866/PKU.WHXB202309002","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The concentration of carbon dioxide (CO&lt;sub&gt;2&lt;/sub&gt;) in the atmosphere is progressively increasing due to industrial development, leading to environmental concerns such as the greenhouse effect. Consequently, it is crucial to decrease dependence on the fossil fuels and mitigate the CO&lt;sub&gt;2&lt;/sub&gt; emissions. Photothermocatalysis technology facilitates the conversion of light energy into heat energy on the surface of catalysts, thereby driving chemical reactions. This catalytic approach effectively harnesses ample solar energy, consequently reducing non-renewable energy consumption. Solar-driven CO&lt;sub&gt;2&lt;/sub&gt; methanation is an important route to simultaneously mitigate excessive carbon emissions and produce fuels. Layered double hydroxides (LDH) can be reduced at high temperature in a reductive atmosphere of a hydrogen/argon (H&lt;sub&gt;2&lt;/sub&gt;/Ar) mixture to prepare metal-loaded oxide (MO) catalysts, which are widely used in CO&lt;sub&gt;2&lt;/sub&gt; hydrogenation reactions as excellent photothermal catalysts. However, there is limited study on how the interlayer anion type of LDH affects the activity of CO&lt;sub&gt;2&lt;/sub&gt; methanation. Herein, a series of LDH precursors, intercalated with various anions, were synthesized using a co-precipitation method. The LDH precursors were reduced in a H&lt;sub&gt;2&lt;/sub&gt;/Ar atmosphere to acquire a group of nickel (Ni) loaded on alumina (Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;) catalysts, referred to as NiAl-x-MO (x = CO&lt;sub&gt;3&lt;/sub&gt;, NO&lt;sub&gt;3&lt;/sub&gt;, Cl, and SO&lt;sub&gt;4&lt;/sub&gt;, which represents carbonate, nitrate, chloride, and sulfate anions, respectively). Energy dispersive spectrometer (EDS) elemental mapping and X-ray photoelectron spectroscopy (XPS) results revealed the presence of nitrogen (N), chlorine (Cl), and sulfur (S) species on the surfaces of NiAl–NO&lt;sub&gt;3&lt;/sub&gt;-MO, NiAl–Cl-MO, and NiAl–SO&lt;sub&gt;4&lt;/sub&gt;-MO catalysts, respectively. Photothermocatalytic tests were conducted on the catalysts to assess the potential influence of the residual species on CO&lt;sub&gt;2&lt;/sub&gt; methanation. Among them, the NiAl–CO&lt;sub&gt;3&lt;/sub&gt;-MO catalyst demonstrated a CO&lt;sub&gt;2&lt;/sub&gt; conversion of 50.1 %, methane (CH&lt;sub&gt;4&lt;/sub&gt;) selectivity of 99.9 %, along with a CH&lt;sub&gt;4&lt;/sub&gt; production rate of 94.4 mmol g&lt;sup&gt;−1&lt;/sup&gt; h&lt;sup&gt;−1&lt;/sup&gt;. The performance of the NiAl–NO&lt;sub&gt;3&lt;/sub&gt;-MO catalyst was found to be comparable to that of the NiAl–CO&lt;sub&gt;3&lt;/sub&gt;-MO catalyst. In contrast, the CO&lt;sub&gt;2&lt;/sub&gt; methanation activity of the NiAl–Cl-MO and NiAl–SO&lt;sub&gt;4&lt;/sub&gt;-MO catalysts were negligible. CO&lt;sub&gt;2&lt;/sub&gt; temperature programmed desorption (CO&lt;sub&gt;2&lt;/sub&gt;-TPD) analysis demonstrated that the presence of N, Cl, and S species had a negligible effect on the adsorption of CO&lt;sub&gt;2&lt;/sub&gt;. H&lt;sub&gt;2&lt;/sub&gt; temperature programmed desorption (H&lt;sub&gt;2&lt;/sub&gt;-TPD) and density functional theory (DFT) results suggested that the strong coordination bond between residual Cl or S species and metallic Ni impeded the absorption and activation of H&lt;sub&gt;2&lt;/sub&gt;, which was responsible for","PeriodicalId":6964,"journal":{"name":"物理化学学报","volume":"41 1","pages":"Article 100002"},"PeriodicalIF":10.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design strategy for thermally activated delayed fluorescence materials with multiple resonance effect","authors":"Zehua Zhang,&nbsp;Haitao Yu,&nbsp;Yanyu Qi","doi":"10.3866/PKU.WHXB202309042","DOIUrl":"10.3866/PKU.WHXB202309042","url":null,"abstract":"<div><div>Since the initial report on multiple resonance thermally activated delayed fluorescence (MR-TADF) molecules, their narrow band emissions, high quantum yields and other characteristics have consistently fueled research interest in the realm of organic electronics, particularly organic light emitting diodes (OLED). These molecules swiftly ascended to the forefront of research, serving as a pivotal focus, giving rise to numerous high-performance devices and meticulously crafted molecules. Devices featuring MR-TADF molecules as the luminescent core continually redefine our comprehension of OLED, with some employing hyperfluorescence technology attaining peak performance in specific photochromic domains today. Presently, with the escalating demand for ultra-high-resolution displays, the international telecommunication union (ITU) has unveiled the next generation color gamut standard, BT.2020. This standard delineates the broadest display color gamut, mandating monochromatic primary color wavelengths of 467, 532, and 630 nm, constituting an exceptionally extensive color gamut. Simultaneously, achieving high-resolution displays with such an expansive color gamut imposes unprecedentedly stringent requirements on the color purity of device elements. Consequently, it imposes a formidable color purity target for display technology. In the past, traditional fluorescent materials struggled to meet these demands. The advent of BT.2020, however, has presented new opportunities for the advancement of MR-TADF molecules, leading to a surge in popularity in this field. In recent years, with copious research and practical applications, the MR-TADF molecular family has undergone rapid evolution. Nevertheless, discussions and summaries primarily centered on the field's development, with limited focus on molecular design strategies. This deficiency hinders adequate reference for researchers entering the field. Consequently, this article expounds upon the design principles of select MR-TADF molecules reported in the past three years. It delves into aspects such as the X-<em>π</em>-X principle, fast reverse intersystem crossing processes, narrow-band emission, and high oscillator strength. Additionally, it posits future design directions, including the incorporation of non-traditional structures into the MR-TADF domain. Finally, the article offers suggestions for the prospective development and industrialization of the MR-TADF field.</div></div>","PeriodicalId":6964,"journal":{"name":"物理化学学报","volume":"41 1","pages":"Article 100006"},"PeriodicalIF":10.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}