报告人: Liu Bin
报告题目：Atomically Dispersed Ni(I) as the Active Site for Electrochemical CO2 Reduction
Bin Liu received his B.Eng. (1st Class Honors) and M.Eng. degrees in Chemical Engineering from the National University of Singapore, and obtained his Ph.D. degree in Chemical Engineering from University of Minnesota in 2011. Thereafter, he moved to University of California, Berkeley and worked as a postdoctoral researcher in Department of Chemistry during 2011 – 2012 before joining School of Chemical and Biomedical Engineering at Nanyang Technological University as an Assistant Professor in 2012. He is now an Associate Professor at NTU. His main research interests are electrocatalysis, photovoltaics and photoelectrochemistry. More information can be found at http://www.ntu.edu.sg/home/liubin/home.html.
Electrochemical reduction of CO2 to chemical fuel offers a promising strategy for managing the global carbon balance, but presents challenges for chemistry due to the lack of effective electrocatalyst. Here in this talk, I am going to present atomically dispersed nickel on nitrogenated graphene as an efficient and durable electrocatalyst for CO2 reduction. Based on operando X-ray absorption and photoelectron spectroscopy measurements, the monovalent Ni(I) atomic center with a d9 electronic configuration was identified as the catalytically active site. The single-Ni-atom catalyst exhibits high intrinsic CO2reduction activity, reaching a specific current of 350?A?gcatalyst?1 and turnover frequency of 14,800?h?1 at a mild overpotential of 0.61?V for CO conversion with 97% Faradaic efficiency. The catalyst maintained 98% of its initial activity after 100?h of continuous reaction at CO formation current densities as high as 22?mA?cm?2.