Understanding the Roles of Hydroxide in CO2Electroreduction on a Cu Electrode for Achieving Variable Selectivity

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Abstract

Hydroxide-derived copper (OH/Cu) electrodes exhibit excellent performance for the electrocatalytic CO2reduction 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 CH4and C2+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(CH4FE) of 78%, C2+FE of 71%, and the ratio of C2+-To-CH4>355. The proposed simple strategy for selectivity control would contribute to further quantity synthesis of value-Added chemicals using CO2RR.

Original languageEnglish
Pages (from-to)14856-14863
Number of pages8
JournalACS Catalysis
Volume12
Issue number24
DOIs
Publication statusPublished - Dec 16 2022

All Science Journal Classification (ASJC) codes

  • Catalysis
  • General Chemistry

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