Stand-alone asymmetric hollow fiber gas-diffusion electrodes with distinguished bronze phases for high-efficiency CO2 electrochemical reduction

Rabiee, Hesamoddin and Ge, Lei ORCID: https://orcid.org/0000-0003-2989-0329 and Zhang, Xueqin and Hu, Shihu and Li, Mengran and Smart, Simon and Zhu, Zhonghua and Wang, Hao and Yuan, Zhiguo (2021) Stand-alone asymmetric hollow fiber gas-diffusion electrodes with distinguished bronze phases for high-efficiency CO2 electrochemical reduction. Applied Catalysis B: Environmental, 298:120538. pp. 1-11. ISSN 0926-3373


Abstract

The development of advanced electrodes is of great importance to improve gas mass transfer for efficient gas-phase CO2 reduction reaction (CO2RR). Gas-diffusion electrodes (GDEs) can maximize CO2 concentration in the close proximity of electrocatalysts, and achieve high-performance catalytic conversion provided that their surface wettability and electrocatalyst nanostructure are finely tuned. Recently, hollow fiber GDEs (HFGDEs) have shown promising CO2RR efficiency, owing to their high surface area and porosity to effectively solve mass transfer issues. Unlike GDE fabrication with alloy catalysts in powder form which require a further deposition step, herein stand-alone bronze HFGDEs with distinguished alloy phases are made via a facile strategy through a two-step electrodeposition-aging process. A uniform covering layer of Cu3Sn or Cu5Sn6 phases on the surface of HFGDE was effectively obtained by controlling Sn electrodeposition thickness and aging duration. Compared to non-selective Cu HFGDE, both alloys showed less formation of H2 and hydrocarbons. Growth of Cu3Sn phase improved CO selectivity compared to Cu HFGDE at lower potentials. Cu5Sn6 HFGDE exhibited formate-selective performance with FE > 80 % over a potential window of 400 mV, reaching 89 ± 3% at -1.1 V vs. RHE. In addition, alloy-coated HFGDEs showed improved wettability and microenvironment for catalyst-electrolyte interface due to the formation of a highly rough surface. This led to more catalytically active areas and higher formate partial current density (136 mA cm−2), outperforming other bronze-based GDEs. This study contributes a facile strategy for the fabrication of bimetallic electrodes with desired alloy phases to be utilized in gas-fed electrolysis in aqueous media.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 02 Aug 2021 01:17
Last Modified: 29 Oct 2021 01:29
Uncontrolled Keywords: CO2 electrochemical reduction reaction; Hollow fiber; Gas diffusion electrodes; Bronze alloy; Formate production
Fields of Research (2008): 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030301 Chemical Characterisation of Materials
09 Engineering > 0904 Chemical Engineering > 090404 Membrane and Separation Technologies
Fields of Research (2020): 40 ENGINEERING > 4004 Chemical engineering > 400404 Electrochemical energy storage and conversion
Identification Number or DOI: https://doi.org/10.1016/j.apcatb.2021.120538
URI: http://eprints.usq.edu.au/id/eprint/42987

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