A Non-Noble Metal Catalyst-Based Electrolyzer for Efficient CO₂-to-Formate Conversion
Date
2021
Authors
Zou, J.
Lee, C.-Y.
Wallace, G.G.
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Journal article
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ACS Sustainable Chemistry and Engineering, 2021; 9(48):16394-16402
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Jinshuo Zou, Chong-Yong Lee, and Gordon G. Wallace
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Abstract
Electrochemical CO₂ reduction offers a promising approach to alleviate environmental and climate impacts attributed to increasing atmospheric CO₂. Intensive research work has been performed over the years on catalysts, membranes, and other associated components related to the development of CO₂ electrolyzers. Herein, we assembled a full cell comprising a Bi nanoparticle (NP)-based cathode for reducing CO₂ to formate and the earth-abundant NiFe layered double hydroxide (LDH)-based anode for oxygen evolution. The electrolyte used was 1 M KOH, and an anion exchange membrane separator was employed. A formate conversion Faradaic efficiency (FEformate) of 90 ± 2% was obtained at the cell voltage of 2.12 V. This full cell system operating at 2.12 V was found to perform well over 10 h, as the FEformate remained above 85% with ∼82% retention of current. This is among the best performing CO₂-to-formate conversion systems based on all non-precious metal catalysts. The low water oxidation overpotential of NiFe LDH, coupled with the highly efficient Bi NPs CO₂ reduction catalyst, and the use of KOH electrolyte operated under flow cell configuration that maximizes the reactant/product mass transfer all contribute to this high-performance electrolyzer.
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© 2021 American Chemical Society