Yajie Zhou, Qinghua Fan, Youzhong Dong, Quan Kuang, Yanming Zhao
{"title":"Delaying-volume-change CaCo2O4/rGO as anode for high performance lithium-ion and sodium-ion batteries","authors":"Yajie Zhou, Qinghua Fan, Youzhong Dong, Quan Kuang, Yanming Zhao","doi":"10.1039/d4dt03061c","DOIUrl":"https://doi.org/10.1039/d4dt03061c","url":null,"abstract":"CaCo2O4/rGO was prepared by sol-gel strategy and mechanical ball milling method. The Rietveld refinement results demonstrate that a single-phase structure with a monoclinic symmetry can be obtained. When utilized as the anode for lithium-ion batteries, it exhibits excellent rate performance and electrochemical stability due to the significantly decreasing the particle size as well as the forming a conductive rGO network in the composite after ball milling. A reversible stable specific capacity of 778 mA h g−l is attained at a current density of 200 mA h g−l after 100 cycles between 0.01-3 V (vs. Li/Li+). The long cycling capacity of 608.5 mA h g−l can still be remained following 300 cycles at 1 A g−l. The evolution of CaCo2O4 structural and phases during electrochemical cycling processes was thoroughly investigated for the first time using in-situ analytical techniques to elucidate the Li+ storage mechanism. Here, the electrochemical performance of CaCo2O4/rGO as the anode material for sodium-ion batteries is also reported on the first occasion, and a reversible specific capacity of 400 mA h g−l can be achieved at a current density of 20 mA h g−l between 0.01-3 V (vs. Na/Na+) with the good electrochemical performance.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"212 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142880077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Construction of ternary TiO2/CdS/IrO2 heterostructure photoanodes for efficient glycerol oxidation coupled with hydrogen evolution","authors":"Chenfeng Jiang, Yibo Ding, Jiayu Lin, Yi Sun, Wei Zhou, Xiaoyan Zhang, Hongbin Zhao, Weimin Cao, Danhong Cheng","doi":"10.1039/d4dt03048f","DOIUrl":"https://doi.org/10.1039/d4dt03048f","url":null,"abstract":"TiO2/CdS heterostructure has been widely investigated as a potential photoanode for photoelectrochemical (PEC) water splitting for hydrogen evolution. However, the efficiency and stability still remains challenging due to the sluggish reaction dynamics for water oxidation and easy photocorrosion of CdS. Here we report a ternary TiO2/CdS/IrO2heterosturcture with IrO2 as a hole transport layer for PEC glycerol oxidation coupled with hydrogen evolution. The photocurrent density of the optimized TiO2/CdS photoanode is 18.8 mA cm-2 (1.23 V vs. RHE), which is about 10.6 times higher than that of the pristine TiO2. It is found that most of the glycerol was converted to formic acid (FA) on the TiO2/CdS surface with the production rate ~603.0 mmol m-2 h-1.The average H2 production rate reaches 1574.5 mmol m-2 h-1. After loading IrO2 nanoparticles, the products for glycerol oxidation remain unchanged with the production rate of FA reaching 863.4 mmol m-2 h-1, while the hydrogen production rate is increased to 2345.2 mmol m-2 h-1 due to the improved stability. The results show that the obtained TiO2/CdS/IrO2 heterostructure can effectively oxidize glycerol to value-added chemicals. The enhanced PEC performance and stability of the TiO2/CdS/IrO2 photoanode can be ascribed to the greatly enhanced electrode/electrolyte interfacial carrier injection efficiency, caused by the fast glycerol oxidation dynamics and intimate contact. This work provides novel ideas to construct high-efficient PEC systems for both clean energy production and high-value chemicals.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"27 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142880078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yong-Ju Bai, Jun-Chao Qi, Ya-Ru Hou, Zhang-Tian Xia, Xin Shen, Hang Peng, Yan-Zi Lu, Yan Qin, Hui-Peng Lv, Wei-Qiang Liao
{"title":"An organic–inorganic hybrid ferroelastic with a near-room-temperature phase transition","authors":"Yong-Ju Bai, Jun-Chao Qi, Ya-Ru Hou, Zhang-Tian Xia, Xin Shen, Hang Peng, Yan-Zi Lu, Yan Qin, Hui-Peng Lv, Wei-Qiang Liao","doi":"10.1039/d4dt03193h","DOIUrl":"https://doi.org/10.1039/d4dt03193h","url":null,"abstract":"Organic–inorganic hybrid metal halides (OIMHs) with ferroelastic phase transition properties have recently attracted great attention due to their widespread application prospects in the fields of energy storage, sensors, switches, <em>etc</em>. However, most of the hybrid ferroelastics exhibit phase transition points (<em>T</em><small><sub>c</sub></small>) far beyond room temperature, which may limit their applications in mechanical switches and energy storage for daily working requirements. Herein, we synthesized a new zinc halide OIMH ferroelastic (<em>E</em>,<em>E</em>)-[BPHD]ZnBr<small><sub>4</sub></small> (BPHD = <em>N</em>1,<em>N</em>6-bis(piperidine-1-yl) hexa-2,4-diene diamide), which experiences a 2/<em>mF</em><img alt=\"[1 with combining macron]\" border=\"0\" src=\"https://www.rsc.org/images/entities/char_0031_0304.gif\"/> type paraelastic–ferroelastic phase transition at a near-room-temperature <em>T</em><small><sub>c</sub></small> of 285 K. It crystallizes in the monoclinic <em>P</em>2<small><sub>1</sub></small>/<em>c</em> space group at 298 K, undergoing a change to the triclinic <em>P</em><img alt=\"[1 with combining macron]\" border=\"0\" src=\"https://www.rsc.org/images/entities/char_0031_0304.gif\"/> space group in the low-temperature phase, with the number of molecules in asymmetric units doubling. Differential scanning calorimetry, variable-temperature electrical resistivity (<em>ρ</em>) and Raman spectrum tests confirm the occurrence of the phase transition, accompanied by a change in <em>ρ</em> of nearly two orders of magnitude, and reversible evolution of ferroelastic domains has been observed. In addition, (<em>E</em>,<em>E</em>)-[BPHD]ZnBr<small><sub>4</sub></small> also exhibits remarkable compliance and softness within the category of hybrid crystals. This work will inspire further exploration of new hybrid ferroelastic materials with near-room-temperature phase transitions.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"85 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Beina Yang, Bei Cheng, Huijuan Li, Tielin Wang, Mingjiang Xie
{"title":"MgxCo1-x(OH)2@C as electrode for supercapacitor: Effect of doping level on energy storage capability","authors":"Beina Yang, Bei Cheng, Huijuan Li, Tielin Wang, Mingjiang Xie","doi":"10.1039/d4dt02949f","DOIUrl":"https://doi.org/10.1039/d4dt02949f","url":null,"abstract":"Incorporating non-electrochemically-active elements (such as Zn, Mg, etc.) into the framework of active components can enhance structural stability, leading to improved cycling performance. However, limited research has been conducted on the impact of varying doping concentrations. In this study, we conducted a comprehensive analysis of how different levels of Mg doping in Co(OH)2 affect supercapacitor performance. We synthesized a range of cobalt hydroxides with precisely controlled Mg content using a cation ion-exchange reaction method. Our findings suggest that the Mg component can be evenly distributed in the composite material, and when the Co/Mg ratio exceeds 1:1, the formation of Mg-O-Co bonds can be observed. When used as an electrode for a supercapacitor, the doped cobalt hydroxides exhibit superior performance compared to the un-doped version and some recently reported cobalt hydroxide based devices, including a high specific capacitance of 700.2 C/g@ 1.0 A/g versus 448.2 F/g@ 1.0 A/g, a large energy density of 48 Wh/kg@800 W/kg versus 39 Wh/kg@775 W/kg, and excellent cycling stability with only slight fluctuations around 100% capacitance retention after 30,000 cycles of continuous charge and discharge. This research not only offers guidance on the optimal doping level of redox-active metal hydroxides for improving supercapacitor performance, but also presents a novel method for preparing various metal hydroxides/oxides and their composite forms.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"9 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A Cooperative Model for Metallocene Catalyst Activation by Methylaluminoxane","authors":"Scott Collins, Mikko Linnolahti","doi":"10.1039/d4dt03124e","DOIUrl":"https://doi.org/10.1039/d4dt03124e","url":null,"abstract":"Activation of rac-Me2Si(η5-Ind)2ZrMe2 (SBIZrMe2) and sheet models for MAO, (MeAlO)6(Me3Al)4 (6,4), (MeAlO)7(Me3Al)5 (7,5), and (MeAlO)26(Me3Al)9 (26,9) has been studied by DFT. These activators can reversibly form an outer-sphere ion-pair (OSIP) [SBIZrMe2AlMe2] [(MeAlO)n(Me3Al)mMe] 3 ([n,m]− = [7,4]−and [26,8]−) or a contact ion-pair (CIP) SBIZrMe-μ-Me-6,4 (2b)from SBIZrMe2. Dissociation of Me3Al from 3 to form CIP SBIZrMe-μ-Me-n,m (2) is generally unfavourable but reversible in toluene continuum. Propene insertion involving CIP 2 features uniformly high barriers of 90-100 kJ mol-1 which is much higher than experiment for MAO-activated catalysts, though the calculated barriers do track with the coordinating ability of the MAO-based anion, as also suggested from the position of the Me3Al-binding equilibria. Binding of neutral sheet 6,4 to anion [7,4]− leads to a hybrid anion [13,8]−. The barrier to propene insertion involving CIP SBIZrMe-μ-Me-13,8 (2e) is lower than 60 kJ mol-1. Formation of [SBIZrMe2AlMe2][13,8] (3e) from SBIZrMe2, 7,5 and 6,4 is favorable though dissociation into 2e and ½ Al2Me6 is not. Simulations of catalyst speciation vs. [Al] at constant [Zr] indicate that formation of species like 2e or 3e from two components of MAO explains the high activity seen for MAO-activated metallocene complexes at sufficiently high Al:Zr ratios.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"125 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Two-dimensional porous porphyrin materials composed of robust tin(IV)-porphyrin linkages for photocatalytic wastewater remediation","authors":"Nirmal Shee, Hee-Joon Kim","doi":"10.1039/d4dt03277b","DOIUrl":"https://doi.org/10.1039/d4dt03277b","url":null,"abstract":"Porphyrin-based two-dimensional porous materials (SnP-H<small><sub>2</sub></small>TCPP (<strong>1</strong>), SnP-ZnTCPP (<strong>2</strong>)) composed of robust Sn(IV)-porphyrin linkages have been synthesized by reacting trans-dihydroxo[5,10,15,20-tetraphenylporphyrinato]tin(IV) (SnP) with [5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin] (H<small><sub>2</sub></small>TCPP) and [5,10,15,20-tetrakis(4-carboxyphenyl)porphyrinato]zinc(II) (ZnTCPP), respectively. The strength of the interaction between the carboxylic acid group of the monomeric porphyrins (H<small><sub>2</sub></small>TCPP and ZnTCPP) and the axial hydroxyl moiety of SnP enables the construction of highly stable framework materials, which were characterized by FT-IR, UV-vis, and emmission spectroscopy, powder XRD, elemental analysis, and thermogravimetric analysis (TGA). <strong>1</strong> and <strong>2</strong> absorb visible light strongly over a wide range, demonstrating weak perturbation in the electronic ground state structures of the π-conjugated aromatic moieties compared to the starting monomeric units. TGA indicated that <strong>1</strong> and <strong>2</strong> exhibited greater thermal stability than SnP. The permanent porosity of <strong>1</strong> and <strong>2</strong> resulted in large specific surface areas (BET) of 210.0 m<small><sup>2</sup></small>g<small><sup>−1</sup></small> and 185.0 m<small><sup>2</sup></small>g<small><sup>−1</sup></small>, respectively. Uniform spherical nanoplates with an average diameter in the range of 900−1000 nm were observed for <strong>1</strong>, whereas a nanocomposite morphology was observed for <strong>2</strong>, whose shape and size could not be specifically defined. Finally, the photodegradation performance of <strong>1</strong> and <strong>2</strong> was found to be 89% (K = 0.0179 min<small><sup>−1</sup></small>) and 97% (K = 0.0246 min<small><sup>−1</sup></small>) within 120 min, respectively, for the degradation of methylene blue (MB), and 50% (K = 0.0091 min<small><sup>−1</sup></small>) and 60% (K = 0.0120 min<small><sup>−1</sup></small>) within 75 min, respectively, for the tetracycline (TC) antibiotic. The enhanced catalytic photodegradation activity of <strong>1</strong> or <strong>2</strong> is attributed to the cooperation between the carboxylate-bearing porphyrin units and SnP.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"14 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chunxue Li, Guixiang Ding, Peng Wang, Kun Liu, Bin Yang, Guangfu Liao
{"title":"Emerging frontiers of nickel-aluminium layered double hydroxide heterojunction for photocatalysis","authors":"Chunxue Li, Guixiang Ding, Peng Wang, Kun Liu, Bin Yang, Guangfu Liao","doi":"10.1039/d4dt03141e","DOIUrl":"https://doi.org/10.1039/d4dt03141e","url":null,"abstract":"The unique superiorities of nickel-aluminium layered double hydroxide (Ni-Al LDH)-based heterojunction, i.e., large special area, tunable bandgap and morphology, abundant reaction sites, high activity, selectivity, and photostability, etc, render them extremely promising for photocatalytic applications. Given the importance and benefits of Ni-Al LDH-based heterojunction in photocatalysis, now is a good moment to give a summary of Ni-Al LDH-based heterojunction for photocatalytic applications. In this frontier, we thoroughly described the material design for Ni-Al LDH-based heterojunction, along with their recent developments in various photocatalytic applications, i.e., H2 evolution, CO2 reduction, and pollution removal. Moreover, the most recent advancements, difficulties, and future prospects of Ni-Al LDH-based heterojunction for photocatalytic applications were emphasized and thoroughly examined. Undoubtedly, in the near future, scientific researchers will put their relentless efforts to exploit the new Ni-Al LDH-based heterojunction for high-performance photocatalytic applications.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"1 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Hydrogen Isotope Separation at Exceptional High Temperature Using Unsaturated Organometallic Complex","authors":"Taku Kitayama, Tamon Yamauchi, Kaiji Uchida, Shunya Tanaka, Ryojun Toyoda, Hiroaki Iguchi, Ryota Sakamoto, Hao Xue, Naoki Kishimoto, Takefumi Yoshida, Tomoya Uruga, Shin-ichiro Noro, Shinya Takaishi","doi":"10.1039/d4dt03018d","DOIUrl":"https://doi.org/10.1039/d4dt03018d","url":null,"abstract":"A new approach for hydrogen isotope separation using an unsaturated organometallic complex was proposed. Adsorption measurements of [Mn(dppe)2(CO)(N2)](BArF24) (Mn-dppe) (dppe = 1,2-bis(diphenylphosphino)ethane, BArF24 = B[C6H3(3,5-CF3)2]4) using H2 and D2 revealed a significant difference in the adsorption enthalpy of H2/D2 at much higher room temperatures than in previous studies, with D2 molecules being more strongly adsorbed on unsaturated metal sites. Mixed gas adsorption isotherms were calculated at each temperature using IAST theory, and it was predicted that D2 uptake was much larger than H2 uptake. Column chromatographic separation using the difference in adsorption enthalpy indicated that deuterium could be concentrated, and DFT calculations suggest that this difference in adsorption force is due to the difference in vibrational potentials involved in metal-dihydrogen bonding. This study introduces a new separation approach that could enable hydrogen isotope separation in the ambient temperature range.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"24 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Investigating the differences of active oxygen species and carbonate species on the surface of Ce0.95M (M = Mn and Zr)0.05O2−δ catalysts prepared by the aerosol method during CO oxidation using operando TPR-DRIFTS-MS","authors":"Jiacheng Xu, Yan Sun, Shuiliang Yao","doi":"10.1039/d4dt02920h","DOIUrl":"https://doi.org/10.1039/d4dt02920h","url":null,"abstract":"Surface oxygen species and carbonate species play an important role in CO oxidation. However, their essential relationsh with CO oxidation activity remains unclear. In this paper, Ce<small><sub>0.95</sub></small>M (M = Mn and Zr)<small><sub>0.05</sub></small>O<small><sub>2−<em>δ</em></sub></small> catalysts are selected as the research target and <em>operando</em> TPR-DRIFTS-MS is used to investigate the changes of oxygen species and carbonate species on the catalyst surface. The Ce<small><sub>0.95</sub></small>Mn<small><sub>0.05</sub></small>O<small><sub>2−<em>δ</em></sub></small> catalyst has the best CO conversion (145 °C) and CO<small><sub>2</sub></small> selectivity (99%). <em>Operando</em> DRIFTS-MS results show that M<img alt=\"[double bond, length as m-dash]\" border=\"0\" src=\"https://www.rsc.org/images/entities/char_e001.gif\"/>O plays a key role on the catalyst surface and can react with CO at low temperatures. Importantly, the high content of M<img alt=\"[double bond, length as m-dash]\" border=\"0\" src=\"https://www.rsc.org/images/entities/char_e001.gif\"/>O is conducive to the formation of monodentate carbonate (M–O–CO<small><sub>2</sub></small>) (M–O–CO<small><sub>2</sub></small> decomposes at 50 °C). As the temperature increases, Ce<img alt=\"[double bond, length as m-dash]\" border=\"0\" src=\"https://www.rsc.org/images/entities/char_e001.gif\"/>O and M–O–Ce also react with CO and produce M–O<small><sub>v</sub></small>–Ce (oxygen vacancies). CO can combine with O<small><sub>2</sub></small> adsorbed on the M–O<small><sub>v</sub></small>–Ce (M<small><sup>2+</sup></small>–O<small><sub>2</sub></small><small><sup>2−</sup></small>) to form bidentate carbonate (M–O<small><sub>2</sub></small>–CO). The decomposition temperature of M–O<small><sub>2</sub></small>–CO is much higher than that of M–O–CO<small><sub>2</sub></small>, and its existence is the decisive step of CO oxidation. The above results provide a new way to regulate the surface oxygen species and carbonate species of Ce based catalysts in the later stages.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"71 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142858018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Solvents and their hydrogen bonding properties as general considerations in carbon dioxide reduction by molecular catalysts","authors":"Xiaohan Li, Jeffrey J. Warren","doi":"10.1039/d4dt02682a","DOIUrl":"https://doi.org/10.1039/d4dt02682a","url":null,"abstract":"Improvements to the understanding of how reaction conditions influence the performance of molecular electrocatalysts are important. There exists a wide range of solution conditions that are used in the investigation of the properties and performance of electrocatalysts, from the choice of solvent or electrolyte to the identity and nature of other additives, like Brønsted acids. Herein, we demonstrate how the choice of solvent can have a significant impact on the observed rate constants for CO<small><sub>2</sub></small>-to-CO conversion by a series of rhenium(<small>I</small>) diimine complexes. In comparison with the observed rate constants in acetonitrile solvent, the use of a strong hydrogen bond-accepting solvent (<em>N</em>,<em>N</em>-dimethylformamide, DMFf) dramatically decreases the observed rate constants in the presence of added phenol (as a proton donor). Based on previous work from our lab and from others, we conclude that such solvent effects are a general phenomenon and are a crucial consideration for investigation of molecular catalysts. Finally, a simple H-bonding model is presented to account for solvent effects in these rhenium(<small>I</small>) CO<small><sub>2</sub></small> reduction systems. The model is general for H-bonding solvents and Brønsted acids and provides a first principles means to estimate the magnitude of solvent effects on CO<small><sub>2</sub></small> reduction kinetics.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"48 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142858019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}