A cold plasma-activatedin situAgCo surface alloy for enhancing the electroreduction of CO2to ethanol

Qiang Zhang, Shuihui Tao, Jun Du*, Anbang He, Yong Yang, Changyuan Tao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

With regard to using the electric energy generated by renewable sources, the CO2electroreduction reaction (CO2RR) for the production of fuels is helpful for creating an artificial carbon cycle. Herein, for the first time, we preparedin situAgCo surface alloy electrocatalysts at room temperature by the cold H2-plasma activation method; these electrocatalysts showed high activity for the CO2RR to ethanol with an excellent faradaic efficiency of ethanol (72.3%) and current density (7.4 mA cm-2at -0.80 V). Based on experiments and DFT calculations, this high intrinsic activity was attributed to the selective suppression of hydrogen evolution and C1 production due to the distortion of the Ag lattice induced by the formation of a {111}Ag + Co surface alloy to reduce the energy barrier for *CO2d-formation; this increased the coverage of CO* and resulted in a C-C coupling reaction to form *OC-CO* on Ag atoms (CO* pool sites), which was further converted to CH3CH2OH. Thus, this result showed that promoting the Ag surface with small amounts of Co is a promising way to improve ethanol selectivity during the CO2RR.

Original languageEnglish
Pages (from-to)8410-8420
Number of pages11
JournalJournal of Materials Chemistry A
Volume8
Issue number17
DOIs
Publication statusPublished - 7 May 2020
Externally publishedYes

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