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- Title
Bioanode‐driven CO<sub>2</sub> electroreduction in a redox‐medium‐assisted system with high energy efficiency.
- Authors
Ye, Zipeng; Li, Youzhi; Zhao, Nannan; Yang, Bin; Hou, Yang; Lei, Lecheng; Li, Zhongjian
- Abstract
CO2 electrocatalytic reduction (CO2ER) is usually energy‐intensive, due to a high overpotential of the coupled anodic oxygen evolution reaction. Combining exoelectrogens catalyzed organic matters oxidation on a bioanode with cathodic CO2ER has a high energy efficiency. However, direct coupling the two half reactions in one electrolysis cell resulted in mismatch problems. Here, a Fe(CN)63−/Fe(CN)64− redox‐medium‐assisted bioanode‐driven CO2ER system was developed. Specifically, electrons and energy in organic matters were recovered by exoelectrogens, and then stored in the redox‐medium, which was further controllably discharged to drive CO2 reduction to CO on a ZnO/Zn alloy electrocatalyst. Benefiting from the redox‐medium, a high energy efficiency of 135% and a CO2 to CO Faradic efficiency of 82% were achieved. The developed system can potentially recover energy from wastewater to valorize CO2 emitted from wastewater treatment and thus evolve traditional wastewater treatment to be a sustainable, carbon neutral, and chemicals producing process.
- Subjects
ENERGY consumption; ELECTROLYTIC reduction; OXYGEN evolution reactions; CHEMICAL processes; CARBON offsetting; CATALYSTS; OXYGEN reduction
- Publication
AIChE Journal, 2021, Vol 67, Issue 8, p1
- ISSN
0001-1541
- Publication type
Article
- DOI
10.1002/aic.17283