Advanced Powder Materials最新文献

{"title":"Targeted doping induces interfacial orientation for constructing surface-functionalized Schottky junctions to coordinate redox reactions in water electrolysis","authors":"Guangping Yang ,&nbsp;Tianxiang Yang ,&nbsp;Zhiguo Wang ,&nbsp;Ke Wang ,&nbsp;Mengmeng Zhang ,&nbsp;Peter D. Lund ,&nbsp;Sining Yun","doi":"10.1016/j.apmate.2024.100224","DOIUrl":"10.1016/j.apmate.2024.100224","url":null,"abstract":"<div><p>Tuning the surface properties of catalysts is an effective method for accelerating water electrolysis. Herein, we propose a directional doping and interfacial coupling strategy to design two surface-functionalized Schottky junction catalysts for coordinating the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Directional doping with B/S atoms endows amphiphilic g-C₃N₄ with significant n-/p-type semiconductor properties. Further coupling with Fe₃C modulates the energy band levels of B–C₃N₄ and S–C₃N₄, thus resulting in functionalized Schottky junction catalysts with specific surface-adsorption properties. The space-charge region generated by the dual modulation induces a local “OH⁻- and H⁺-enriched” environment, thus selectively promoting the kinetic behavior of the OER/HER. Impressively, the designed B–C₃N₄@Fe₃C||S–C₃N₄@Fe₃C pair requires only a low voltage of 1.52 ​V to achieve efficient water electrolysis at 10 ​mA ​cm⁻². This work highlights the potential of functionalized Schottky junction catalysts for coordinating redox reactions in water electrolysis, thereby resolving the trade-off between catalytic activity and stability.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"3 5","pages":"Article 100224"},"PeriodicalIF":0.0,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772834X24000551/pdfft?md5=75d62da94bdae536ceaf12b9ddcf0503&pid=1-s2.0-S2772834X24000551-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141847064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nitrogen-doping assisted local chemical heterogeneity and mechanical properties in CoCrMoW alloys manufactured via laser powder bed fusion","authors":"Wenting Jiang ,&nbsp;Ruidi Li ,&nbsp;Junyang He ,&nbsp;Song Ni ,&nbsp;Li Wang ,&nbsp;Zibin Chen ,&nbsp;Yi Huang ,&nbsp;Caiju Li ,&nbsp;Jianhong Yi ,&nbsp;Min Song","doi":"10.1016/j.apmate.2024.100217","DOIUrl":"10.1016/j.apmate.2024.100217","url":null,"abstract":"<div><p>CoCrMoW alloys with different nitrogen (N) additions (0, 0.05, 0.1, and 0.2 ​wt%) were prepared via laser powder bed fusion (LPBF). The effects of N content on the microstructure and mechanical properties were investigated. The results indicate that the LPBFed CoCrMoW alloy with 0.1 ​wt% N addition (0.1 ​N alloy) shows the best combination of mechanical properties with a yield strength of ∼983 ​MPa and an elongation of ∼19 ​%. Both the LPBF process and the N addition impose great effects on suppressing the γ to ε martensitic transformation, resulting in a decrease in the width and amount of ε laths/stacking faults. Besides, the N addition promotes the segregation of elements Mo, W, and Si along the cellular sub-grain boundaries (CBs), forming fine and discontinuous precipitates rich in Mo, W and Si along the CBs in the 0.1 ​N alloy, but dense and continuous (Mo,W)₅Si₃ precipitates along the CBs in the 0.2 ​N alloy. The (Mo,W)₅Si₃ precipitates with a tetragonal structure were observed and characterized for the first time in the Co–Cr based alloys. The negative mixing enthalpy between the non-metallic elements N, Si and the metallic elements Mo, W, Cr, and the rapid solidification induced segregation of high melting point elements such as Mo and W along CBs during LPBF process, synergistically contribute to the chemical heterogeneity in the alloys. The pure FCC matrix, the slightly increased segregation of Mo, W, Si elements and fine precipitates along the CBs contribute to the good combination of strength and elongation of the 0.1 ​N alloy. However, though pure FCC phase was present in the 0.2 ​N alloy, the dense and continuous (Mo,W)₅Si₃ precipitates along CBs acted as nucleation sites for cracks, deteriorating the elongation of the alloy. Overall, it is possible to tune the mechanical properties of the LPBFed CoCrMoW alloy by adjusting the local chemical heterogeneity.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"3 5","pages":"Article 100217"},"PeriodicalIF":0.0,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772834X24000484/pdfft?md5=dbc6179d1fb2e5c35355045e5ad1207b&pid=1-s2.0-S2772834X24000484-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141843053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unlocking the decomposition limitations of the Li2C2O4 for highly efficient cathode preliathiations","authors":"Hongqiang Zhang ,&nbsp;Tiansheng Bai ,&nbsp;Jun Cheng ,&nbsp;Fengjun Ji ,&nbsp;Zhen Zeng ,&nbsp;Yuanyuan Li ,&nbsp;Chenwu Zhang ,&nbsp;Jiaxian Wang ,&nbsp;Weihao Xia ,&nbsp;Naixuan Ci ,&nbsp;Yixuan Guo ,&nbsp;Dandan Gao ,&nbsp;Wei Zhai ,&nbsp;Jingyu Lu ,&nbsp;Lijie Ci ,&nbsp;Deping Li","doi":"10.1016/j.apmate.2024.100215","DOIUrl":"10.1016/j.apmate.2024.100215","url":null,"abstract":"<div><p>The development of high-energy-density Li-ion batteries is hindered by the irreversible capacity loss during the initial charge-discharge process. Therefore, pre-lithiation technology has emerged in the past few decades as a powerful method to supplement the undesired lithium loss, thereby maximizing the energy utilization of LIBs and extending their cycle life. Lithium oxalate (Li₂C₂O₄), with a high lithium content and excellent air stability, has been considered one of the most promising materials for lithium compensation. However, the sluggish electrochemical decomposition kinetics of the material severely hinders its further commercial application. Here, we introduce a recrystallization strategy combined with atomic Ni catalysts to modulate the mass transport and decomposition reaction kinetics. The decomposition potential of Li₂C₂O₄ is significantly decreased from ∼4.90V to ∼4.30V with a high compatibility with the current battery systems. In compared to the bare NCM//Li cell, the Ni/N-rGO and Li₂C₂O₄ composite (Ni-LCO) modified cell releases an extra capacity of ∼11.7 ​%. Moreover, this ratio can be magnified in the NCM//SiO_{<strong><em>x</em></strong>} full cell, resulting in a 30.4 ​% higher reversible capacity. Overall, this work brings the catalytic paradigm into the pre-lithiation technology, which opens another window for the development of high-energy-density battery systems.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"3 5","pages":"Article 100215"},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772834X24000460/pdfft?md5=f2d45bb40a716d7aaf4df8fc3e6f6380&pid=1-s2.0-S2772834X24000460-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141716119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magnetostrictive strain-sensitivity synergy for laser-beam powder bed fusion processed Fe81Ga19 alloys by magnetic field annealing","authors":"Xiong Yao ,&nbsp;Desheng Li ,&nbsp;Chengde Gao ,&nbsp;Youwen Deng ,&nbsp;Jing Zhang ,&nbsp;Cijun Shuai","doi":"10.1016/j.apmate.2024.100216","DOIUrl":"10.1016/j.apmate.2024.100216","url":null,"abstract":"<div><p>Magnetostrictive Fe–Ga alloys have been demonstrated potentialities for numerous applications, whereas, suffering a tradeoff between large magnetostrictive strain and high sensitivity. Herein, bulk polycrystalline Fe₈₁Ga₁₉ alloys were prepared by laser-beam powder bed fusion (LPBF) and then annealed in magnetic field for manipulating the comprehensive magnetostrictive properties. Results indicate that &lt;001&gt; oriented grains are developed in the LPBF-prepared Fe₈₁Ga₁₉ alloys due to high temperature gradient. After magnetic field annealing (MFA), the magnetic domains within the alloys gradually transformed into well-arranged stripe domains, especially, flat and smooth 90° domains were established in the alloys annealed at 2600 ​Oe. As a result, the induced &lt;001&gt; orientation grains and 90° domains contributed to an improved effective magnetic anisotropy constant (57.053 ​kJ/m³), leading to an enhanced magnetostrictive strain of 92 ​ppm. Moreover, the MFA-treated alloys also displayed enhanced magnetostrictive sensitivity (0.097 ​ppm/Oe) owing to the smooth domain structures and low dislocation densities, demonstrating a fruitful strain-sensitivity synergy. In addition, good magnetostrictive dynamic response and enhanced compressive yield strength were also observed for the prepared alloys. This work demonstrates that LPBF and MFA might be an attractive strategy to resolve the tradeoff between strain and sensitivity, providing a basis for the preparation of high-performance magnetostrictive materials.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"3 5","pages":"Article 100216"},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772834X24000472/pdfft?md5=b9a9aa370e1017a8b0febb84154c7a85&pid=1-s2.0-S2772834X24000472-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141690117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The hybrid Pt nanoclusters/Ru nanowires catalysts accelerating alkaline hydrogen evolution reaction","authors":"Jingjing Yan ,&nbsp;Rundong Wu ,&nbsp;Guoqiang Jin ,&nbsp;Litao Jia ,&nbsp;Gang Feng ,&nbsp;Xili Tong","doi":"10.1016/j.apmate.2024.100214","DOIUrl":"10.1016/j.apmate.2024.100214","url":null,"abstract":"<div><p>Water electrolysis <em>via</em> alkaline hydrogen evolution reaction (HER) is a promising approach for large-scale production of high-purity hydrogen at a low cost, utilizing renewable and clean energy. However, the sluggish kinetics derived from the high energy barrier of water dissociation impedes seriously its practical application. Herein, a series of hybrid Pt nanoclusters/Ru nanowires (Pt/Ru NWs) catalysts are demonstrated to accelerate alkaline HER. And the optimized Pt/Ru NWs (10 ​% wt Pt) exhibits exceptional performance with an ultralow overpotential (24 ​mV at 10 ​mA ​cm⁻²), a small Tafel slope (26.3 ​mV dec⁻¹), and long-term stability, outperforming the benchmark commercial Pt/C-JM-20 ​% wt catalyst. This amazing performance also occurred in the alkaline anion-exchange membrane water electrolysis devices, where it delivered a cell voltage of about 1.9 ​V at 1 ​A ​cm⁻² and an outstanding stability (more than 100 ​h). The calculations have revealed such a superior performance exhibited by Pt/Ru NWs stems from the formed heterointerfaces, which significantly reduce the energy barrier of the decisive rate step of water dissociation <em>via</em> cooperative-action between Pt cluster and Ru substance. This work provides valuable perspectives for designing advanced materials toward alkaline HER and beyond.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"3 5","pages":"Article 100214"},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772834X24000459/pdfft?md5=52691e83edca92335d2a520f9fd45770&pid=1-s2.0-S2772834X24000459-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141406616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent developments in synthesis, properties, and applications of 2D Janus MoSSe and MoSexS(1-x) alloys","authors":"Seetha Lakshmy ,&nbsp;Brinti Mondal ,&nbsp;Nandakumar Kalarikkal ,&nbsp;Chandra Sekhar Rout ,&nbsp;Brahmananda Chakraborty","doi":"10.1016/j.apmate.2024.100204","DOIUrl":"10.1016/j.apmate.2024.100204","url":null,"abstract":"<div><p>The Janus MoSSe and alloy MoS_<em>x</em>Se_{(1-<em>x</em>)}, belonging to the family of two-dimensional (2D) transition metal dichalcogenides (TMDs), have gained significant attention for their potential applications in nanotechnology. The unique asymmetric structure of Janus MoSSe provides intriguing possibilities for tailored applications. The alloy MoS_<em>x</em>Se_{(1-<em>x</em>)} offers a tunable composition, allowing for the fine-tuning of the properties to meet specific requirements. These materials exhibit remarkable mechanical, electrical, and optical properties, including a tunable band gap, high absorption coefficient, and photoconductivity. The vibrational and magnetic properties also make it a promising candidate for nanoscale sensing and magnetic storage applications. Properties of these materials can be precisely controlled through different approaches such as size-dependent properties, phase engineering, doping, alloying, defect and vacancy engineering, intercalation, morphology, and heterojunction or hybridisation. Various synthesis methods for 2D Janus MoSSe and alloy MoS_<em>x</em>Se_{(1-<em>x</em>)} are discussed, including hydro/solvothermal, chemical vapour transport, chemical vapour deposition, physical vapour depositio, and other approaches. The review also presents the latest advancements in Janus and alloy MoSSe-based applications, such as chemical and gas sensors, surface-enhanced Raman spectroscopy, field emission, and energy storage. Moreover, the review highlights the challenges and future directions in the research of these materials, including the need for improved synthesis methods, understanding of their stability, and exploration of new applications. Despite the early stages of research, both the MoSSe-based materials have shown significant potential in various fields, and this review provides valuable insights for researchers and engineers interested in exploring its potential.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"3 4","pages":"Article 100204"},"PeriodicalIF":0.0,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772834X24000356/pdfft?md5=69255623bca33cfc4aff10c014788e7f&pid=1-s2.0-S2772834X24000356-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141140111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrahigh energy density in dielectric nanocomposites by modulating nanofiller orientation and polymer crystallization behavior","authors":"Ru Guo,&nbsp;Hang Luo,&nbsp;Di Zhai,&nbsp;Zhida Xiao,&nbsp;Haoran Xie,&nbsp;Yuan Liu,&nbsp;Fan Wang,&nbsp;Xun Jiang,&nbsp;Dou Zhang","doi":"10.1016/j.apmate.2024.100212","DOIUrl":"10.1016/j.apmate.2024.100212","url":null,"abstract":"<div><p>High-energy density dielectrics for electrostatic capacitors are in urgent demand for advanced electronics and electrical power systems. Poly(vinylidene fluoride) (PVDF) based nanocomposites have attracted remarkable attention by intrinsic high polarization, flexibility, low density, and outstanding processability. However, it is still challenging to achieve significant improvement in energy density due to the common contradictions between electric polarization and breakdown strength. Here, we proposed a novel facile strategy that simultaneously achieves the construction of in-plane oriented BaTiO₃ nanowires and crystallization modulation of PVDF matrix via an <em>in-situ</em> uniaxial stretch process. The polar phase transition and enhanced Young's modulus facilitate the synergetic improvement of electric polarization and voltage endurance capability for PVDF matrix. Additionally, the aligned distribution of nanowires could reduce the contact probability of nanowire tips, thus alleviating electric field concentration and hindering the conductive path. Finally, a record high energy density of 38.3 ​J/cm³ and 40.9 ​J/cm³ are achieved for single layer and optimized sandwich-structured nanocomposite, respectively. This work provides a unique structural design and universal method for dielectric nanocomposites with ultrahigh energy density, which presents a promising prospect of practical application for modern energy storage systems.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"3 5","pages":"Article 100212"},"PeriodicalIF":0.0,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772834X24000435/pdfft?md5=d2764fc449217ba05309871b76fdad65&pid=1-s2.0-S2772834X24000435-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141143953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Theoretical design and experimental verification of high-entropy carbide ablative resistant coating","authors":"Lingxiang Guo,&nbsp;Shiwei Huang,&nbsp;Wei Li,&nbsp;Junshuai Lv,&nbsp;Jia Sun","doi":"10.1016/j.apmate.2024.100213","DOIUrl":"10.1016/j.apmate.2024.100213","url":null,"abstract":"<div><p>Composition design of high-entropy carbides is a topic of great scientific interest for the hot-end parts in the aerospace field. A novel theoretical method through an inverse composition design route, <em>i.e.</em> initially ensuring the oxide scale with excellent anti-ablation stability, is proposed to improve the ablation resistance of the high-entropy carbide coatings. In this work, the (Hf_0.36Zr_0.24Ti_0.1Sc_0.1Y_0.1La_0.1)C_1-δ (HEC) coatings were prepared by the inverse design concept and verified by the ablation resistance experiment. The linear ablation rate of the HEC coatings is −1.45 ​μm/s, only 4.78 % of the pristine HfC coatings after the oxyacetylene ablation at 4.18 ​MW/m². The HEC possesses higher toughness with a higher Pugh's ratio of 1.55 in comparison with HfC (1.30). The <em>in-situ</em> formed dense (Hf_0.36Zr_0.24Ti_0.1Sc_0.1Y_0.1La_0.1)O_2-δ oxide scale during ablation benefits to improve the anti-ablation performance attributed to its high structural adaptability with a lattice constant change not exceeding 0.19 % at 2000–2300 ​°C. The current investigation demonstrates the effectiveness of the inverse theoretical design, providing a novel optimization approach for ablation protection of high-entropy carbide coatings.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"3 5","pages":"Article 100213"},"PeriodicalIF":0.0,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772834X24000447/pdfft?md5=3f879f7b5d3ddb3bae27c7a495277ceb&pid=1-s2.0-S2772834X24000447-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141135987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing proton exchange membrane water electrolysis by building electron/proton pathways","authors":"Liyan Zhu ,&nbsp;Hao Zhang ,&nbsp;Aojie Zhang ,&nbsp;Tian Tian ,&nbsp;Yuhan Shen ,&nbsp;Mingjuan Wu ,&nbsp;Neng Li ,&nbsp;Haolin Tang","doi":"10.1016/j.apmate.2024.100203","DOIUrl":"https://doi.org/10.1016/j.apmate.2024.100203","url":null,"abstract":"<div><p>Proton exchange membrane water electrolysis (PEMWE) plays a critical role in practical hydrogen production. Except for the electrode activities, the widespread deployment of PEMWE is severely obstructed by the poor electron-proton permeability across the catalyst layer (CL) and the inefficient transport structure. In this work, the PEDOT:F (Poly(3,4-ethylenedioxythiophene):perfluorosulfonic acid) ionomers with mixed proton-electron conductor (MPEC) were fabricated, which allows for a homogeneous anodic CL structure and the construction of a highly efficient triple-phase interface. The PEDOT:F exhibits strong perfluorosulfonic acid (PFSA) side chain extensibility, enabling the formation of large hydrophilic ion clusters that form proton-electron transport channels within the CL networks, thus contributing to the surface reactant water adsorption. The PEMWE device employing membrane electrode assembly (MEA) prepared by PEDOT:F-2 demonstrates a competitive voltage of 1.713 ​V under a water-splitting current of 2 ​A ​cm⁻² (1.746 ​V at 2A cm⁻² for MEA prepared by Nafion D520), along with exceptional long-term stability. Meanwhile, the MEA prepared by PEDOT:F-2 also exhibits lower ohmic resistance, which is reduced by 23.4 ​% and 17.6 ​% at 0.1 ​A ​cm⁻² and 1.5 ​A ​cm⁻², respectively, as compared to the MEA prepared by D520. The augmentation can be ascribed to the superior proton and electron conductivity inherent in PEDOT:F, coupled with its remarkable structural stability. This characteristic enables expeditious mass transfer during electrolytic reactions, thereby enhancing the performance of PEMWE devices.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"3 4","pages":"Article 100203"},"PeriodicalIF":0.0,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772834X24000344/pdfft?md5=36f1d7765a8be5d8d664a3f896a74748&pid=1-s2.0-S2772834X24000344-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140948365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bound-state electrons synergy over photochromic high-crystalline C3N5 nanosheets in enhancing charge separation for photocatalytic H2 production","authors":"Yu Shen ,&nbsp;Xin Du ,&nbsp;Yuxing Shi ,&nbsp;Loic Jiresse Nguetsa Kuate ,&nbsp;Zhouze Chen ,&nbsp;Cheng Zhu ,&nbsp;Lei Tan ,&nbsp;Feng Guo ,&nbsp;Shijie Li ,&nbsp;Weilong Shi","doi":"10.1016/j.apmate.2024.100202","DOIUrl":"10.1016/j.apmate.2024.100202","url":null,"abstract":"<div><p>Solar-driven water splitting for photocatalytic hydrogen evolution is considered a highly promising and cost-effective solution to achieve a stable renewable energy supply. However, the sluggish kinetics of electron-hole pairs’ separation poses challenges in attaining satisfactory hydrogen production efficiency. Herein, we synthesized the exceptional performance of highly crystalline C₃N₅ (HC–C₃N₅) nanosheet as a photocatalyst, demonstrating a remarkable hydrogen evolution rate of 3.01 ​mmol ​h⁻¹ ​g⁻¹, which surpasses that of bulk C₃N₅ (B–C₃N₅) by a factor of 3.27. Experimental and theoretical analyses reveal that HC-C₃N₅ nanosheets exhibit intriguing macroscopic photoinduced color changes, effectively broadening the absorption spectrum and significantly enhancing the generation of excitons. Besides, the cyano groups in HC-C₃N₅ efficiently captures and converts photoexcited electrons into bound states, thereby prolonging their lifetimes and effectively separating electrons and holes into catalytically active regions. This research provides valuable insights into the establishment of bound electronic states for developing efficient photocatalysts.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"3 4","pages":"Article 100202"},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772834X24000332/pdfft?md5=f8a2554db749073890ffdbae68512abf&pid=1-s2.0-S2772834X24000332-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140755872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}