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High-performance electrochemical CO2 reduction cells based on non-noble metal catalysts

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journal contribution
posted on 23.11.2018, 10:19 by Xu Lu, Yueshen Wu, Xiaolei Yuan, Ling Huang, Zishan Wu, Jin Xuan, Yifei Wang, Hailiang Wang
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.

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 Letters

Volume

3

Issue

10

Pages

2527 - 2532

Citation

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 Society

Version

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

18/09/2018

Publication date

2018-09-18

eISSN

2380-8195

Language

en

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