文献类型：期刊文献

英文题名：Sn-Ag Synergistic Effect Enhances High-Rate Electrocatalytic CO2-to-Formate Conversion on Porous Poly(Ionic Liquid) Support

作者：Duan, Xiu-Qiang[1,2];Duan, Guo-Yi[2,3];Wang, Yao-Feng[2];Li, Xiao-Qiang[2];Wang, Rui[2];Zhang, Rui[1,4];Xu, Bao-Hua[2,3]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Inst Proc Engn, Beijing Key Lab Ion Liquids Clean Proc, CAS Key Lab Green Proc & Engn,State Key Lab Multip, Beijing 100190, Peoples R China;[3]Beijing Inst Technol, Sch Chem & Chem Engn, Beijing Key Lab Chem Power Source & Green Catalysi, Beijing 100081, Peoples R China;[4]East China Normal Univ, Sch Chem & Mol Engn, Shanghai Key Lab Green Chem & Chem Proc, Shanghai 200062, Peoples R China

年份：2023

卷号：19

期号：18

外文期刊名：SMALL

收录：;EI(收录号：20230613553001);WOS:【SCI-EXPANDED(收录号:WOS:000922212400001)】；

基金：X.-Q.D. and G.-Y.D. contributed equally to this work. Financial support from Key Research Program of Frontier Sciences of CAS (ZDBS-LY-JSC022), Excellent Young Scientists Fund (22022815), National Natural Science Foundation of China (22178346), and Open Research Fund of Shanghai Key Laboratory of Green Chemistry and Chemical Processes of East China Normal University are gratefully acknowledged. The authors sincerely appreciate Prof. S. Zhang form IPE for his great support.

语种：英文

外文关键词：CO2 transformation; electrolysis; electronic structure tuning; ionic liquids; synergistic effect

摘要：The electrocatalytic transformation of carbon dioxide (CO2) to formate is a promising route for highly efficient conversion and utilization of CO2 gas, due to the low production cost and the ease of storage of formate. In this work, porous poly(ionic liquid) (PPIL)-based tin-silver (Sn-Ag) bimetallic hybrids (PPILm-SnxAg10-x) are prepared for high-performance formate electrolytic generation. Under optimal conditions, an excellent formate Faradaic efficiency of 95.5% with a high partial current density of 214.9 mA cm(-2) is obtained at -1.03 V (vs reversible hydrogen electrode). Meanwhile, the high selectivity of formate (>approximate to 83%) is maintained in a wide potential range (>630 mV). Mechanistic studies demonstrate that the presence of Ag-species is vital for the formation, maintenance, and high dispersion of tetravalent Sn(IV)-species, which accounts for the active sites for CO2-to-formate conversion. Further, the introduction of Ag-species significantly enhances the activity by increasing the electron density near the Fermi energy level.