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3D core-shell porous-structured Cu@Sn hybrid electrodes with unprecedented selective CO2-into-formate achieving 100%

Abstract

Cu-based catalysts are exceptionally advantageous for the electrochemical CO2 reduction reaction (CO2RR) to fuels and chemical products utilizing clean and renewable energy. However, most of which tend to yield a diversity of hydrocarbon products along with the H2 evolution side reaction. We reveal how a 3D core-shell porous-structured Cu@Sn hybrid electrode can lead to an unprecedented selective CO2 electroreduction to HCOO-. Such an advantageous architecture is assembled via an in situ electrodeposition protocol using a dynamic hydrogen bubble template, rendering an enlarged electrode surface area when evaluated as an electrode material for CO2RR. Notably, the best performing electrode, i.e., Cu@Sn(1), achieved a reduction current density of 55 mA cm-2 at -2.0 V vs. SCE, and an extremely encouraging Faradaic efficiency of 100% at applied potential −1.6 V vs. SCE, accompanied by a partial current density of 16.52 mA cm-2. Moreover, it manifested a remarkable stable operation over 15 hours of continuous electrolysis in aqueous KHCO3 solution. Numerically solving mass transfer equations and the Butler-Volmer equation show how the optimized presence of granular structured Sn on the surface of Cu was found to be the key for enhancing the HCOO- selectivity and the mass activity.

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Publication details

The article was received on 15 Nov 2018, accepted on 09 Jan 2019 and first published on 10 Jan 2019


Article type: Paper
DOI: 10.1039/C8TA10650A
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript
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    3D core-shell porous-structured Cu@Sn hybrid electrodes with unprecedented selective CO2-into-formate achieving 100%

    J. Qiao, X. Hou, L. Lv, Y. Cai, X. Zhang, Y. Liu, D. Zhang, Z. Zhu and L. Peng, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C8TA10650A

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