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Research Article

Enhanced electroreduction of CO2 to C2+ fuels by the synergetic effect of polyaniline/CuO nanosheets hybrids

Lian Ma1, Qinghong Geng1, Longlong Fan1, Jun-Xuan Li1, Dawei Du2, Junli Bai2,3, Cuiling Li1,2,4( )
Key Laboratory of Cluster Science, Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, China
Binzhou Institute of Technology, Binzhou 256600, China
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Graphical Abstract

Polyaniline (PANI)/CuO nanosheets (NSs) hybrid electrocatalysts are developed in order to achieve superior C2+ selectivity by imparting polyimide functional component to the CuO NSs. PANI/CuO NSs-25 sample exhibits outperforming electrochemical CO2 reduction reaction (CO2RR) performance with Faradaic efficiency (FE) for C2+ product up to 66.4% at −1.6 V vs. reversible hydrogen electrode (RHE) and no decay of C2+ selectivity during a time period of 92 h.

Abstract

Electrochemically converting CO2 to value-added multi-carbon (C2+) fuels and chemicals is a favorable way to achieve carbon neutrality. Herein, polyaniline/CuO nanosheets (PANI/CuO NSs) hybrid electrocatalysts are developed in order to achieve superior C2+ selectivity by imparting PANI functional component to the CuO NSs. The decorated PANI nanoparticles (NPs) can effectively stabilize the *CO intermediates and increase their coverage on the active Cu sites, which facilitates the C–C coupling to form multi-carbon products. Benefiting from the synergetic effect of PANI and CuO NSs, best Faradaic efficiency (FE) for C2+ product up to 66.4% at −1.6 V vs. reversible hydrogen electrode (RHE) in a H-cell measurement and 60.0% at 400 mA·cm−2 in a flow cell measurement are demonstrated by PANI/CuO NSs-25 sample. More importantly, the C2+ selectivity keeps stable even in a continuous measurement time period of 92 h in H-cell measurement. The present study may provide more insights for designing efficient hybrid materials toward superior C2+ production from electrocatalytic CO2 reduction.

Keywords

electrochemical CO2 reductionCuO nanosheets (NSs)electrocatalysispolyaniline (PANI)C2+ selectivity

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Nano Research
Volume 16 Issue 7,
July 2023
Pages 9065-9072
DOI: 10.1007/s12274-023-5703-1
Cite this article:
Ma L, Geng Q, Fan L, et al. Enhanced electroreduction of CO2 to C2+ fuels by the synergetic effect of polyaniline/CuO nanosheets hybrids. Nano Research, 2023, 16(7): 9065-9072. https://doi.org/10.1007/s12274-023-5703-1
Topics:
Electrocatalysis

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Received: 15 February 2023
Revised: 27 March 2023
Accepted: 30 March 2023
Published: 25 May 2023
© Tsinghua University Press 2023
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