Synthesis of Axially Coordinated Cobalt Porphyrin/graphene Oxide Nanocomposite for Enhanced Electrocatalytic CO2 Reduction to CO

• 作者: YOU Wei-Feng XU Xiao CAO Ai-Hui TAO Zhi-Jie KANG Long-Tian
• 来源期刊: 结构化学
• 年，卷（期）: 2022,（3）
• 页码范围: 1-11
• 页数: 11页
• 语种: 英文
• DOI: 10.14102/j.cnki.0254-5861.2011-3247

摘要

The electrocatalysts containing cobalt-pyrrolic nitrogen-carbon(Co-N4-C)moiety for CO2 reduction reaction(CO2RR)have caught much attention.However,the effects of Co valence state and its synergy with gra-phene substrate are not clear yet.In this work,cobalt porphyrin(CoTPP)molecule with the intrinsic Co-N4-C moiety is successfully combined with graphene oxide(GO)via three kinds of liquid-phase methods.The ratio of CoTPP to GO and the valence state of Co atom are studied to explore their catalysis for CO2RR to CO.It is found that axial-ly-coordinated Co(Ⅲ)TPPCl/GO nanocomposites synthesized via a chemical method exhibit better ability for CO2RR,as compared with Co(Ⅱ)TPP+GO and/or Co(Ⅲ)TPPCl+GO nanocomposites obtained via a physically mixing way.After optimizing the ratio of CoTPP to GO,the Faradaic efficiency(FE)is more than 90％for CO2RR to CO between-0.7 and-0.8 V vs.reversible hydrogen electrode(RHE)in Co(Ⅲ)TPPCl/GO75.The synergy be-tween CoTPP and GO and the effect of Co valence state are systematically investigated,indicating that their strong interaction plays the key role in electrocatalytic CO2RR.