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Copper–Indium Binary Catalyst on a Gas Diffusion Electrode for High-Performance CO2 Electrochemical Reduction with Record CO Production Efficiency

Lookup NU author(s): Hang Xiang, Dr Shahid Rasul, Dr Jose Portoles, Professor Peter Cumpson, Professor Eileen Yu

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by American Chemical Society, 2020.

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Abstract

© 2019 American Chemical Society.Cu-In metallic hybrid is a promising non-noble catalyst for selective electrochemical CO2 reduction (eCO2R) to CO, but the lack of direct assembly with a gas diffusion electrode (GDE) limits the further development of eCO2R to CO with both high Faradaic efficiency (FE) and high current density. In this study, an in situ electrochemical spontaneous precipitation (ESP) method was applied for the first time to prepare GDE-combined Cu-In electrocatalysts. The optimum Cu-In catalyst consists of a nanoscale "core-shell" structure of polycrystalline CuxO covered by the amorphous In(OH)3 interface. Higher than 90% FE of CO production has been achieved. With the synergy of a GDE flow cell and 1 M KOH catholyte, a current density of ∼200 mA cm-2 was reached at -1.17 V (reversible hydrogen electrode), which enabled a CO yield efficiency record of 3.05 mg min-1(CO2/15 mL min-1 with a 2 cm2 electrode). The ratios between CO and H2 produced can be effectively modulated via fine-tuning ESP conditions demonstrating possibility of generating CO or syngas with tuneable ratios. The present study provides a simple approach for constructing novel catalytic interfaces with dual active centers for eCO2R and other emerging electrochemical catalysis research.


Publication metadata

Author(s): Xiang H, Rasul S, Hou B, Portoles J, Cumpson P, Yu EH

Publication type: Article

Publication status: Published

Journal: ACS Applied Materials and Interfaces

Year: 2020

Volume: 12

Issue: 1

Pages: 601-608

Online publication date: 09/12/2019

Acceptance date: 09/12/2019

Date deposited: 21/02/2020

ISSN (print): 1944-8244

ISSN (electronic): 1944-8252

Publisher: American Chemical Society

URL: https://doi.org/10.1021/acsami.9b16862

DOI: 10.1021/acsami.9b16862

Data Source Location: https://doi.org/10.25405/data.ncl.11343974.


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