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High-performance electrochemical CO2 reduction cells based on non-noble metal catalysts
journal contribution
posted on 2018-11-23, 10:19 authored by Xu Lu, Yueshen Wu, Xiaolei Yuan, Ling Huang, Zishan Wu, Jin Xuan, Yifei Wang, Hailiang WangThe 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.
Funding
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.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Chemical Engineering
Published in
ACS Energy LettersVolume
3Issue
10Pages
2527 - 2532Citation
LU, X. ... et al, 2018. High-performance electrochemical CO2 reduction cells based on non-noble metal catalysts. ACS Energy Letters, 3 (10), pp.2527-2532.Publisher
© American Chemical SocietyVersion
- AM (Accepted Manuscript)
Publisher statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Energy Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acsenergylett.8b01681.Acceptance date
2018-09-18Publication date
2018-09-18eISSN
2380-8195Publisher version
Language
- en