Real‐time Monitoring Reveals Dissolution/Redeposition Mechanism in Copper Nanocatalysts during the Initial Stages of the CO 2 Reduction Reaction
| Autor: | Vasiliki Tileli, Jan Vavra, Dragos Stoian, Tzu-Hsien Shen, Raffaella Buonsanti |
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| Rok vydání: | 2020 |
| Předmět: |
Coalescence (physics)
Materials science 010405 organic chemistry chemistry.chemical_element General Chemistry General Medicine Electrochemistry Electrocatalyst 010402 general chemistry Redox Copper 01 natural sciences Catalysis Nanomaterial-based catalyst 0104 chemical sciences chemistry Chemical engineering Dissolution |
| Zdroj: | Angewandte Chemie. 133:1367-1374 |
| ISSN: | 1521-3757 0044-8249 |
| Popis: | Size, morphology, and surface sites of electrocatalysts have a major impact on their performance. Understanding how, when, and why these parameters change under operating conditions is of importance for designing stable, active, and selective catalysts. Herein, we study the reconstruction of a Cu-based nanocatalysts during the startup phase of the electrochemical CO2 reduction reaction by combining results from electrochemical in situ transmission electron microscopy with operando X-ray absorption spectroscopy. We reveal that dissolution followed by redeposition, rather than coalescence, is the mechanism responsible for the size increase and morphology change of the electrocatalyst. Furthermore, we point out the key role played by the formation of copper oxides in the process. Understanding of the underlying processes opens a pathway to rational design of Cu electro (re)deposited catalysts and to stability improvement for catalysts fabricated by other methods. |
| Databáze: | OpenAIRE |
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