Electrohydrogenation of Carbon Dioxide using a Ternary Pd/Cu2O–Cu Catalyst

Jing Li, Si Xuan Guo, Feng Li, Fengwang Li, Xiaolong Zhang, Jiantai Ma, Douglas R. MacFarlane, Alan M. Bond, Jie Zhang

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Abstract

A simple one-pot method has been developed to synthesize a palladium/cuprous oxide-copper (Pd/Cu2O–Cu) material with a well-defined structure, by modification of Cu2O–Cu with Pd through a galvanic replacement reaction. Compared with the well-known copper/cuprous oxide (Cu/Cu2O) catalysts, the Pd/Cu2O–Cu material can catalyze the electroreduction of CO2 into C1 products with much higher faradaic efficiencies at lower overpotentials in a CO2-saturated 0.5 m NaHCO3 solution. In particular, the highest faradaic efficiencies of 92 % for formate and 30 % for methane were achieved at −0.25 and −0.65 V (vs. the reversible hydrogen electrode), respectively. The improvement is suggested to be the result of a synergistic effect between PdH and the catalytically active copper sites during electrochemical CO2 reduction.

Original languageEnglish
Pages (from-to)4471-4479
Number of pages9
JournalChemSusChem
Volume12
Issue number19
DOIs
Publication statusPublished - 8 Oct 2019

Keywords

  • carbon dioxide
  • copper
  • electrocatalysis
  • hydrocarbons
  • palladium

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