Y与-NH2协同催化CO2电还原制乙烯的性能研究
Study on the performance of Y and -NH2 synergistically catalyzing CO2 electroreduction to ethylene
开发高效电催化剂以实现二氧化碳电还原(ECO2RR)制乙烯(C2H4)是实现碳循环经济的核心。为解决Cu基催化剂C—C耦合慢与产物选择性低等问题,提出稀土钇(Y)掺杂与胺基(-NH2)修饰协同策略。最终在500 mA/cm2电流密度下,所获得的Cu3.43Y0.18-NH2催化剂展现出63.1%的C2H4法拉第效率(FE),显著优于未修饰样品(23.9%)。表征结果表明,Y掺杂调控了Cu的电子结构,优化了 *CO中间体吸附并促进C—C耦合;表面-NH2则作为CO2捕获位点,提升了界面CO2的覆盖度,为设计高性能CO2还原铜基催化剂提供了新思路。
Developing efficient electrocatalysts for electrochemical CO2 reduction (ECO2RR) to produce ethylene (C2H4) is central to achieving a carbon circular economy.To address the challenges of slow C—C coupling and low product selectivity in Cu-based catalysts,this study proposes a synergistic strategy combining rare-earth yttrium (Y) doping with amino (-NH2) functionalization.As a result,under a current density of 500 mA·cm-2,the Cu3.43Y0.18-NH2 catalyst achieved a Faradaic efficiency (FE) for C2H4 of 63.1%,significantly higher than that of the unmodified sample (23.9%).Characterization results indicate that Y doping regulates the electronic structure of Cu,optimizes *CO intermediate adsorption,and promotes C—C coupling,while surface -NH2 groups act as CO2 capture sites,enhancing the interfacial CO2 coverage.This work provides new insights for the design of high-performance Cu-based catalysts for CO2 reduction.
二氧化碳电还原 / 铜基催化剂 / 稀土掺杂 / 胺基修饰 / 协同效应
ECO2RR / Cu-based catalysts / rare-earth doping / amino group modification / synergistic effect
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云南省兴滇人才支持计划青年人才项目(XDYC-QNRC-2024-145)
云南省自然科学基金面上项目(202401CF070148)
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