Shape-tuned electrodeposition of bismuth-based nanosheets on flow-through hollow fiber gas diffusion electrode for high-efficiency CO2 reduction to formate

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 Yuan, Zhiguo (2021) Shape-tuned electrodeposition of bismuth-based nanosheets on flow-through hollow fiber gas diffusion electrode for high-efficiency CO2 reduction to formate. Applied Catalysis B: Environmental, 286:119945. pp. 1-12. ISSN 0926-3373

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Abstract

Gas-phase CO2 electrochemical reduction reaction (CO2RR) requires advanced gas diffusion electrodes (GDEs) for efficient mass transport. Meantime, engineering catalyst nanostructure and tuning surface wettability are decisive to enhance three-phase interfaces formation. Herein, Bi-based nanosheets are uniformly grown on flow-through Cu hollow fiber GDE (HFGDE) to benefit from the unique shape of HFGDEs, and abundant active surface area of nanosheets. Pulse electrodeposition is used to replenish Bi3+ ions in the vicinity of HFGDEs for uniform growth of Bi nanosheets. Further, thermal oxidation of nanosheets not only maximized the active sites and improved surface wettability but also induced Bi/Bi2O3 junctions in nanosheets, enhancing formate production via switching the rate-limiting step from the initial electron transfer to hydrogenation. Consequently, a current density of 141 mA cm−2 at -1 V vs. RHE with formate faradaic efficiency of 85 % and over six times greater catalyst mass activity compared to bulk particle shaped Bi, were achieved, outperforming other reported Bi-based GDEs used for formate production in bicarbonate electrolytes. This comes from less charge-transfer resistance, higher surface roughness, and improved wettability of Bi nanosheets after oxidation. This work represents a facile strategy to engineer efficient HFGDEs as advanced electrode materials for similar electrochemical reactions with low aqueous solubility gas-phase feeds.


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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: 03 Feb 2021 01:26
Last Modified: 09 Mar 2021 01:22
Uncontrolled Keywords: CO2 electrochemical reduction reaction; 2D materials; Hollow fiber gas diffusion; electrodes; Electrocatalysis; Formate production; Bismuth electrocatalyst
Fields of Research (2008): 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030304 Physical Chemistry of Materials
09 Engineering > 0904 Chemical Engineering > 090404 Membrane and Separation Technologies
03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030306 Synthesis of Materials
09 Engineering > 0904 Chemical Engineering > 090402 Catalytic Process Engineering
Fields of Research (2020): 40 ENGINEERING > 4004 Chemical engineering > 400404 Electrochemical energy storage and conversion
34 CHEMICAL SCIENCES > 3403 Macromolecular and materials chemistry > 340305 Physical properties of materials
Socio-Economic Objectives (2020): 17 ENERGY > 1703 Energy storage, distribution and supply > 170302 Carbon capture and storage
Identification Number or DOI: https://doi.org/10.1016/j.apcatb.2021.119945
URI: http://eprints.usq.edu.au/id/eprint/41086

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