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Formation of Enriched Vacancies for Enhanced CO2 Electrocatalytic Reduction over AuCu Alloys

Authors :
Piaoping Yang
Lei Zhang
Wenjin Zhu
Rentao Mu
Zhi-Jian Zhao
Congling Hu
Jinlong Gong
Hao Dong
Source :
ACS Energy Letters. 3:2144-2149
Publication Year :
2018
Publisher :
American Chemical Society (ACS), 2018.

Abstract

Electroreduction (ER) of carbon dioxide (CO2) is a promising way to curb excessive CO2 emission and produce value-added products. Gold–copper (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.

Details

ISSN :
23808195
Volume :
3
Database :
OpenAIRE
Journal :
ACS Energy Letters
Accession number :
edsair.doi...........fbccf836140e3eb9a73da630a77b6039