Modulated Sn Oxidation States over a Cu2O-Derived Substrate for Selective Electrochemical CO2 Reduction
Article
Article Title | Modulated Sn Oxidation States over a Cu2O-Derived Substrate for Selective Electrochemical CO2 Reduction |
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ERA Journal ID | 40638 |
Article Category | Article |
Authors | Li, Mengran (Author), Tian, Xiaohe (Author), Garg, Sahil (Author), Rufford, Thomas E. (Author), Zhao, Peiyao (Author), Wu, Yuming (Author), Yago, Anya Josefa (Author), Ge, Lei (Author), Rudolph, Victor (Author) and Wang, Geoff (Guoxiong) (Author) |
Journal Title | ACS Applied Materials and Interfaces |
Journal Citation | 12 (20), pp. 22760-22770 |
Number of Pages | 11 |
Year | 2020 |
Publisher | American Chemical Society |
Place of Publication | United States |
ISSN | 1944-8244 |
1944-8252 | |
Digital Object Identifier (DOI) | https://doi.org/10.1021/acsami.0c00412 |
Web Address (URL) | https://pubs.acs.org/doi/10.1021/acsami.0c00412 |
Abstract | Pursuing high catalytic selectivity is challenging but paramount for an efficient and low-cost CO2 electrochemical reduction (CO2R). In this work, we demonstrate a significant correlation between the selectivity of CO2R to formate and the duration of tin (Sn) electrodeposition over a cuprous oxide (Cu2O)-derived substrate. A Sn electrodeposition time of 120 s led to a cathode with a formate Faradaic efficiency of around 81% at −1.1 V vs reversible hydrogen electrode (RHE), which was more than 37% higher than those of the Sn foil and the sample treated for 684 s. This result highlights the significant role of the interface between deposited Sn and the cuprous-derived substrate in determining the selectivity of CO2R. High-resolution X-ray photoelectron spectra revealed that the residual cuprous species at the Cu/Sn interfaces could stabilize Sn species in oxidation states of 2+ and 4+, a mixture of which is essential for a selective formate conversion. Such modulation effects likely arise from the moderate electronegativity of the cuprous species that is lower than that of Sn2+ but higher than that of Sn4+. Our work highlights the significant role of the substrate in the selectivity of the deposited catalyst and provides a new avenue to advance selective electrodes for CO2 electrochemical reduction. |
Keywords | CO2 electrochemical reduction; formate production; electronegativity; tin electrocatalyst catalyst; substrate |
ANZSRC Field of Research 2020 | 340604. Electrochemistry |
400404. Electrochemical energy storage and conversion | |
Byline Affiliations | University of Queensland |
University of Massachusetts, United States | |
Centre for Future Materials | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5v84/modulated-sn-oxidation-states-over-a-cu2o-derived-substrate-for-selective-electrochemical-co2-reduction
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