Unveiling the effects of dimensionality of tin oxide-derived catalysts on CO2 reduction by using gas-diffusion electrodes

Li, Mengran and Idros, Mohamed Nazmi and Wu, Yuming and Garg, Sahil and Gao, Shuai and Lin, Rijia and Rabiee, Hesamoddin and Li, Zhiheng and Ge, Lei ORCID: https://orcid.org/0000-0003-2989-0329 and Rufford, Thomas Edward and Zhu, Zhonghua and Li, Liye and Wang, Geoff (2021) Unveiling the effects of dimensionality of tin oxide-derived catalysts on CO2 reduction by using gas-diffusion electrodes. Reaction Chemistry & Engineering, 6 (2). pp. 345-352. ISSN 2058-9883


Abstract

We report the effects of catalyst dimensionality on electrochemical CO2 conversion to formate by comparing the performance of tin oxide-derived 3D nanoparticles and tin oxide-derived 2D nanosheets deposited on gas-diffusion electrodes. Our results indicated that an extensive interface between the catalyst and the electrode substrate could lower the surface tin oxidation states and the hydrophobicity of the catalyst layer during CO2 electrolysis at a current density over 100 mA cm−2. This catalyst–substrate interfacial effect provides the nanosheets with a large interface area to become more selective for CO2 electrochemical reduction but with a higher overpotential requirement as compared to the 3D nanoparticle catalysts with limited interfacial area. Consequently, the electrode with nanosheets as the catalyst achieved a partial current density of formate at 116 mA cm−2 at a cathode potential of −1.03 V versus reversible hydrogen electrode, which is equivalent to a formate production rate of 36 μmol min−1 cm−2. Our work here demonstrates the importance of the catalyst–substrate interface in determining the oxidation states and wettability at the catalyst surface and the ultimate performance of the gas-diffusion electrode. These findings also have potential to guide the design of a catalyst–substrate to advance other important electrochemical processes such as fuel cells and water splitting.


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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: 10 Feb 2021 01:29
Last Modified: 10 Feb 2021 01:29
Uncontrolled Keywords: catalyst dimensionality; electrochemical CO2 conversion; tin oxide-derived 3D nanoparticles; tin oxide-derived 2D nanosheets; gas-diffusion electrodes
Fields of Research (2008): 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030304 Physical Chemistry 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 > 340303 Nanochemistry
Identification Number or DOI: https://doi.org/10.1039/D0RE00396D
URI: http://eprints.usq.edu.au/id/eprint/41187

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