Boosting electrochemical reduction of CO_(2)to CO using molecule-regulated Ag nanoparticle in ionic liquids  

作　　者：Fangfang Li Kuilin Peng Chongyang Jiang Shaojuan Zeng Xiangping Zhang Xiaoyan Ji 

机构地区：[1]Energy Engineering,Division of Energy Science,LuleåUniversity of Technology,Luleå,97187,Sweden [2]Beijing Key Laboratory of Ionic Liquids Clean Process,State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing,100190,China [3]College of Chemical Engineering and Environment,China University of Petroleum,Beijing,102249,China

出　　处：《Green Energy & Environment》2025年第4期813-820,共8页绿色能源与环境(英文版)

基　　金：supported by the Swedish Energy Agency(P47500-1);the National Key R&D Program of China(2020YFA0710200);the National Natural Science Foundation of China(22378401 and U22A20416);the financial support from STINT(CH2019-8287);support from the European Union and Swedish Energy Agency(P2020-90066).

摘　　要：Electrochemical reduction of CO_(2)is a promising approach to convert CO_(2)to high-valued chemicals and fuels.However,developing efficient electrocatalysts featuring desirable activity and selectivity is still a big challenge.In this work,a strategy of introducing functionalized molecules with desirable CO_(2)affinity to regulate Ag catalyst for promoting electrochemical reduction of CO_(2)was proposed.Specifically,3-mercapto-1,2,4-triazole was introduced onto the Ag nanoparticle(Ag-m-Triz)for the first time to achieve selectively converting CO_(2)to carbon monoxide(CO).This Ag-m-Triz exhibits excellent performance for CO_(2)reduction with a high CO Faradaic efficiency(FECO)of 99.2%and CO partial current density of 85.0 mA cm^(-2)at-2.3 V vs.Ag/Agt in H-cell when combined with the ionic liquid-based electrolyte,30 wt%1-butyl-3-methylimidazolium hexafluorophosphate([Bmim][PF6])-65 wt%acetonitrile(AcN)-5 wt%H2O,which is 2.5-fold higher than the current density in Ag-powder under the same condition.Mechanism studies confirm that the significantly improved performance of Ag-m-Triz originates from(i)the stronger adsorption ability of CO_(2)molecule and(ii)the weaker binding energy to form the COOH*intermediate on the surface of Ag-m-Triz compared with the Ag-powder catalyst,which boosts the conversion of CO_(2)to CO.This research provides a facile way to regulate electrocatalysts for efficient CO_(2)reduction by introducing functionalized molecules.

关 键 词：CO_(2)reduction CO ELECTROCHEMICAL Molecule-regulated Silver Ionic liquid 

分 类 号：O643.36[理学—物理化学]