High-performance electrochemical CO2 reduction cells based on non-noble metal catalysts
journal contributionposted on 23.11.2018 by Xu Lu, Yueshen Wu, Xiaolei Yuan, Ling Huang, Zishan Wu, Jin Xuan, Yifei Wang, Hailiang Wang
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The promise and challenge of electrochemical mitigation of CO2 calls for innovations on both catalyst and reactor levels. In this work, enabled by our high-performance and earth-abundant CO2 electroreduction catalyst materials, we developed alkaline microflow electrolytic cells for energy-efficient, selective, fast, and durable CO2 conversion to CO and HCOO-. With a cobalt phthalocyanine-based cathode catalyst, the CO-selective cell starts to operate at a 0.26 V overpotential and reaches a Faradaic efficiency of 94% and a partial current density of 31 mA/cm2 at a 0.56 V overpotential. With a SnO2-based cathode catalyst, the HCOO--selective cell starts to operate at a 0.76 V overpotential and reaches a Faradaic efficiency of 82% and a partial current density of 113 mA/cm2 at a 1.36 V overpotential. In contrast to previous studies, we found that the overpotential reduction from using the alkaline electrolyte is mostly contributed by a pH gradient near the cathode surface.
This research is supported by the National Science Foundation (Grant CHE-1651717) and the Croucher Fellowship for Postdoctoral Research. X.Y. and L.H. acknowledge the visiting graduate student scholarships from China scholarships Council.
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