Tuning the Product Selectivity of the Cu Hollow Fiber Gas Diffusion Electrode for Efficient CO2 Reduction to Formate by Controlled Surface Sn Electrodeposition

Rabiee, Hesamoddin and Zhang, Xueqin and Ge, Lei ORCID: https://orcid.org/0000-0003-2989-0329 and Hu, Shihu and Li, Mengran and Smart, Simon and Zhu, Zhonghua and Yuan, Zhiguo (2020) Tuning the Product Selectivity of the Cu Hollow Fiber Gas Diffusion Electrode for Efficient CO2 Reduction to Formate by Controlled Surface Sn Electrodeposition. ACS Applied Materials & Interfaces, 12 (19). pp. 21670-21681. ISSN 1944-8244


Abstract

The efficient CO2 electrochemical reduction reaction (CO2RR) relies not only on the development of selective/active catalysts but also on the advanced electrode configuration to solve the critical issue of poor CO2 mass transport and derived sluggish cathodic reaction kinetics. In this work, to achieve a favorable reaction rate and product selectivity, we designed and synthesized an asymmetric porous Cu hollow fiber gas diffusion electrode (HFGDE) with controlled Sn surface electrodeposition. The HFGDE derived from the optimal Sn electrodeposition condition exhibited a formate Faradaic efficiency (FE) of 78% and a current density of 88 mA cm–2 at −1.2 V versus reversible hydrogen electrode, which are more than 2 times higher than those from the pristine Cu HFGDE. The achieved performance outperformed most of the other Sn-based GDEs, indicating the creation of sufficient contact among CO2, electrolyte, and electrode catalyst through the design of the hollow fiber pore structure and catalytic active sites. The enhancement of formate production selectivity and the suppression of the hydrogen by-product were attributed to the optimized ratio of SnOx species on the electrode surface. The best performance was seen in the HFGDE with the highest Sn2+/Sn4+ (120 s deposition), likely due to the modulating effect of the Cu substrate via electron donation with Sn species. The selectivity control strategy developed in the asymmetric HFGDE provides an efficient and facile method to stimulate selective electrochemical reactions in which the gas-phase reactant with low solubility is involved.


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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: 05 Jan 2021 03:43
Last Modified: 19 Jan 2021 04:03
Uncontrolled Keywords: CO2 electrochemical reduction; hollow fiber gas diffusion electrode; composite electrocatalyst; formate formation; Sn electrocatalyst
Fields of Research (2008): 03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030604 Electrochemistry
Fields of Research (2020): 34 CHEMICAL SCIENCES > 3406 Physical chemistry > 340604 Electrochemistry
40 ENGINEERING > 4004 Chemical engineering > 400404 Electrochemical energy storage and conversion
Socio-Economic Objectives (2008): B Economic Development > 85 Energy > 8506 Energy Storage, Distribution and Supply > 850602 Energy Storage (excl. Hydrogen)
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280110 Expanding knowledge in engineering
17 ENERGY > 1703 Energy storage, distribution and supply > 170304 Energy storage (excl. hydrogen and batteries)
Identification Number or DOI: https://doi.org/10.1021/acsami.0c03681
URI: http://eprints.usq.edu.au/id/eprint/38712

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