High-Performance Electrochemical CO2 Reduction Cells Based on Non-noble Metal Catalysts

Xu Lu, Yueshen Wu, Xiaolei Yuan, Ling Huang, Zishan Wu, Jin Xuan, Yifei Wang, Hailiang Wang

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

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.
Original languageEnglish (US)
Pages (from-to)2527-2532
Number of pages6
JournalACS Energy Letters
Volume3
Issue number10
DOIs
StatePublished - Oct 12 2018
Externally publishedYes

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