CO2 Electroreduction Performance of Transition Metal Dimers Supported on Graphene: A Theoretical Study

详细信息    查看全文

• 作者：Yawei Li ; Haibin Su ; Siew Hwa Chan ; Qiang Sun
• 刊名：ACS Catalysis
• 出版年：2015
• 出版时间：November 6, 2015
• 年：2015
• 卷：5
• 期：11
• 页码：6658-6664
• 全文大小：524K
• ISSN：2155-5435

文摘

Graphene-based materials are being hotly pursued for energy and environment applications. Inspired by the recent experimental synthesis of Fe₂ dimer supported on graphene (He, Z.; He, K.; Robertson, A. W.; Kirkland, A. I.; Kim, D.; Ihm, J.; Yoon, E.; Lee, G.-D.; Warner, J. H. Nano Lett. 2014, 14, 3766鈥?772), here using large-scale screening-based density functional theory and microkinetics modeling, we have identified that some transition metal dimers (Cu₂, CuMn, and CuNi), when supported on graphene with adjacent single vacancies (labeled as XY@2SV), perform better in CO₂ electroreduction with reduced overpotental and enhanced current density. Specifically, Cu₂@2SV is catalytically active toward CO production, similar to Au electrodes but distinct from bulk Cu; MnCu@2SV is selective toward CH₄ generation, while NiCu@2SV promotes CH₃OH production because of the difference in oxophilicity between incorporated Mn and Ni. The advantages of the outstanding selectivity of products, the high dispersity of spatial distribution, and the reduced overpotentials allow these new systems to be promising catalysts, which will motivate more experimental research in this direction to further explore graphene-based materials for CO₂ conversion.