Hydrophobicity graded gas diffusion electrode with enhanced CO intermediate coverage for high-performance electroreduction of CO2 to ethylene

Linbo Li, Xiaolong Zhang, Chuangwei Liu, Venkata Sai Sriram Mosali, Jun Chen, Alan M. Bond, Qinfen Gu, Jie Zhang

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4 Citations (Scopus)

Abstract

Electroreduction using a gas diffusion electrode (GDE) provides an efficient method for high rate conversion of CO2 to value-added chemicals. However, long term production with high yields remains challenging due to rapid electrolyte flooding through the hydrophobic gas diffusion layer (GDL). Here, we report a universal strategy to convert a commercial GDL into a hydrophobicity graded GDL (HGGDL) that resists electrolyte flooding. The CO2 electroreduction performance of a family of tandem catalysts consisting of a nickel-single-atom catalyst and Cu nanoparticles immobilized on GDLs and HGGDLs is compared with respect to ethylene production. In situ Raman studies reveal that the HGGDL increases the CO intermediate coverage as a result of the higher differential pressure across the electrodes. Lower carbonate formation also is observed. Enhanced ethylene production efficiency and an order of magnitude improvement in long term stability is achieved in a membrane electrode assembly electrolyzer.

Original languageEnglish
Article number122597
Number of pages10
JournalApplied Catalysis B: Environmental
Volume331
DOIs
Publication statusPublished - 15 Aug 2023

Keywords

  • Electrochemical CO reduction
  • Enhanced CO intermediate coverage
  • Hydrophobicity graded gas diffusion layer
  • Polytetrafluoroethylene
  • Stable ethylene production

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