首页|Understanding the Roles of Hydroxide in CO2 Electroreduction on a Cu Electrode for Achieving Variable Selectivity

Understanding the Roles of Hydroxide in CO2 Electroreduction on a Cu Electrode for Achieving Variable Selectivity

扫码查看
原文链接
  • NSTL
Hydroxide-derived copper (OH/Cu) electrodes exhibit excellent performance for the electrocatalytic CO2 reduction reaction (CO2RR). However, the role of hydroxide (OH) in CO2RR remains controversial; therefore, the origin of the selectivity enhancement emerging on OH/Cu has not been fully understood. In the present work, we quantitatively evaluated surface OH by electroadsorption and established a direct correlation between the OH amount and selectivity for the production of CH4 and C_(2+) on OH/Cu with the help of computational investigations concerning work functions of the surface. Based on these findings, we demonstrated variable selectivity using OH/Cu electrodes having a controlled OH amount; three OH/Cu electrodes realized their distinct selectivity such as Faradic efficiency (FE) for the production of CH4 (CH4 FE) of 78%, C_(2+) FE of 71%, and the ratio of C_(2+)-to-CH4 >355. The proposed simple strategy for selectivity control would contribute to further quantity synthesis of value-added chemicals using CO2RR.

CO2 reduction reactionhydroxidework functionelectroadsorptionvariable selectivity

Mingxu Sun、Aleksandar Staykov、Miho Yamauchi

展开 >

Department of Chemistry, Graduate School of Science, Kyushu University, Fukuoka 819-0395, Japan

International Institute for Carbon-Neutral Energy Research (WPI-I CNER) and Research Center for Negative Emissions Technologies (K-Nets), Kyushu University, Fukuoka 819-0395, Japan

2022

10.1021/acscatal.2c03650

ACS catalysis

ACS catalysis

EI
ISSN：2155-5435
年,卷(期)：2022.12(24)
  • 9
  • 39