Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 10, Issue 3, Pages 1309-1319Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta07119j
Keywords
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Funding
- National Key R&D Program of China [2018YFC0309800, 2017YFC0506004]
- National Natural Science Foundation of China [21978170]
- Natural Science Foundation of Shanghai [19ZR1424800]
- Oceanic Interdisciplinary Program of Shanghai Jiao Tong University [SL2020MS022]
- Start-up Fund for Youngman Research at SJTU
- Center of Hydrogen Science, Shanghai Jiao Tong University, China
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This study proposes a method of substituting the sluggish oxygen evolution reaction with glycerol oxidation reaction for efficient CO2 electroreduction, which achieves the coproduction of formate at both the cathode and anode. A highly efficient CO2ER system is successfully established with a specific catalyst, demonstrating the potential of non-noble metal catalysts for organic oxidation reactions.
The sluggish oxygen evolution reaction (OER) is one of the main bottlenecks for efficient CO2 electroreduction (CO2ER). Seeking a suitable organic oxidation reaction with a lower redox potential to replace the OER is a promising method to boost the overall efficiency of the CO2ER. Here, we propose a method of substituting the OER with a glycerol oxidation reaction (GOR) for the CO2ER to achieve the coproduction of formate at both the cathode and anode. A two-electrode GOR-assisted CO2ER system is successfully established with a Ni foam-supported surface-sulfurized nickel-cobalt hydroxide nanoneedle catalytic anode (Ni0.33Co0.67(OH)(2)@HOS/NF) and a BiOI cathode. The simultaneous formation of formate from the anodic GOR and cathodic CO2ER with faradaic efficiencies (FEs) of 90% and 92%, respectively, is obtained at a cell voltage of 1.9 V (22.4 mA cm(-2)). More significantly, an overall electricity-to-formate energy conversion efficiency of 110% is obtained in our GOR-assisted CO2ER system. This work not only proposes an energy- and atom-efficient method for the CO2ER but also provides new insights for developing highly active non-noble metal catalysts for the GOR.
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