Hierarchical Copper with Inherent Hydrophobicity Mitigates Electrode Flooding for High-Rate CO2 Electroreduction to Multicarbon Products
| Autor: | Li-Ping Chi, Zhuang-Zhuang Niu, Min-Rui Gao, Fei-Yue Gao, Ren Liu, Shuai Qin, Peng-Peng Yang, Xingxing Yu, Xiao-Long Zhang, Zhi-Zheng Wu |
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| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_element
General Chemistry Electrolyte 010402 general chemistry 01 natural sciences Biochemistry Copper Catalysis 0104 chemical sciences chemistry.chemical_compound Colloid and Surface Chemistry chemistry Resist Chemical engineering Electrode Carbon dioxide Carbon Faraday efficiency |
| Zdroj: | Journal of the American Chemical Society. 143:8011-8021 |
| ISSN: | 1520-5126 0002-7863 |
| Popis: | Copper is currently the material with the most promise as catalyst to drive carbon dioxide (CO₂) electroreduction to produce value-added multicarbon (C₂₊) compounds. However, a copper catalyst on a carbon-based gas diffusion layer electrode often has poor stability—especially when performing at high current densities—owing to electrolyte flooding caused by the hydrophobicity decrease of the gas diffusion layer during operation. Here, we report a bioinspired copper catalyst on a gas diffusion layer that mimics the unique hierarchical structuring of Setaria’s hydrophobic leaves. This hierarchical copper structure endows the CO₂ reduction electrode with sufficient hydrophobicity to build a robust gas–liquid–solid triple-phase boundary, which can not only trap more CO₂ close to the active copper surface but also effectively resist electrolyte flooding even under high-rate operation. We consequently achieved a high C₂₊ production rate of 255 ± 5.7 mA cm–² with a 64 ± 1.4% faradaic efficiency, as well as outstanding operational stability at 300 mA cm–² over 45 h in a flow reactor, largely outperforming its wettable copper counterparts. |
| Databáze: | OpenAIRE |
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