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“Hot Edges” in Inverse Opal Structure Enable Efficient CO2 Electrochemical Reduction and Sensitive in-situ Raman Characterization

Abstract

Conversion of CO2 into fuels and chemicals via electroreduction has attracted significant interest. Via mesostructure design to tune the electric field distribution in the electrode, it is demonstrated that Cu-In alloy with inverse opal (CI-1-IO) structure provides efficient electrochemical CO2 reduction and allows for sensitive detection of the CO2 reduction intermediates via surface-enhanced Raman scattering. The significant enhancement of Raman signal of the intermediates on CI-1-IO surface can be attributed to electric field enhancement on the “hot edges” of the inverse opal structure. Additionally, a CO2 reduction Faradaic efficiency (FE) of 92% is achieved at -0.6 V vs. RHE on CI-1-IO electrode. The DRIFTS results show that the Cu-In alloy with inverse opal have a faster adsorption kinetic and higher adsorption capacity of CO2. The “hot edges” of the bowl-like structure concentrate electric fields, due to the high curvature and also concentrate K+ on the active sites, which can lower the energy barrier of the CO2 reduction reaction. This research provides new insight into the design of materials for efficient CO2 conversion and the intermediates detection during CO2 reduction processes.

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Publication details

The article was received on 01 Mar 2019, accepted on 09 Apr 2019 and first published on 09 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA02288K
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    “Hot Edges” in Inverse Opal Structure Enable Efficient CO2 Electrochemical Reduction and Sensitive in-situ Raman Characterization

    Y. Yang, L. Ohnoutek, S. Ajmal, X. Zheng, Y. Feng, K. Li, T. Wang, Y. Deng, Y. Liu, D. Xu, V. K. Valev and L. Zhang, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA02288K

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