%0 Journal Article
%T Formation of Enriched Vacancies for Enhanced CO2 Electrocatalytic Reduction over AuCu Alloys
%J -
%D 2018
%R https://doi.org/10.1021/acsenergylett.8b01286
%X Electroreduction (ER) of carbon dioxide (CO2) is a promising way to curb excessive CO2 emission and produce value-added products. Gold¨Ccopper (AuCu) alloys are known to exhibit eminent CO production performance toward CO2ER. However, it still remains a grand challenge to balance *COOH and *CO bonding and to further decrease CO onset potential. This Letter describes the construction of Cu vacancies at an abrupt surface over a dealloyed AuCu catalyst to effectively decrease the overpotential and increase CO faradaic efficiency. Dealloyed Au3Cu exhibited a 90.2% CO faradaic efficiency at £¿0.38 V vs RHE and a 418.60 A/g CO mass current density at £¿0.8 V. vs RHE, achieving the record for CO production among AuCu catalysts. Combining the experimental and theoretical results, we concluded that the improved performance primarily results from the enhanced *COOH absorption
%U https://pubs.acs.org/doi/10.1021/acsenergylett.8b01286