Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 26, Issue 18, Pages 4013-4018Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201903158
Keywords
bismuth oxide; CO2 reduction; electrocatalysis; formic acid; integrated foam electrode
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Funding
- Ministry of Science and Technology of the People's Republic of China [2016YFB0100103]
- National Program on Key Basic Research Project of China [2014CB932300]
- National Natural Science Foundation of China [21422108, 51472232]
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Electroreduction of CO2 into formic acid (HCOOH) is of particular interest as a hydrogen carrier and chemical feedstock. However, its conversion is limited by a high overpotential and low stability due to undesirable catalysts and electrode design. Herein, an integrated 3D bismuth oxide ultrathin nanosheets/carbon foam electrode is designed by a sponge effect and N-atom anchor for energy-efficient and selective electrocatalytic conversion of CO2 to HCOOH for the first time. Benefitting from the unique 3D array foam architecture for highly efficient mass transfer, and optimized exposed active sites, as confirmed by density functional theory calculations, the integrated electrode achieves high electrocatalytic performance, including superior partial current density and faradaic efficiency (up to 94.1 %) at a moderate overpotential as well as a high energy conversion efficiency of 60.3 % and long-term durability.
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