| Autor: |
Xiang-Ning Song, Yu-Xi Huang, Han-Qing Yu, Wen-Wei Li, Jiafang Xie, Lu Xiong |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Electrochimica Acta. 139:137-144 |
| ISSN: |
0013-4686 |
| DOI: |
10.1016/j.electacta.2014.06.034 |
| Popis: |
The existing Cu-based electrocatalysts for electrochemical reduction of CO 2 to chemical commodities suffer instability and large reaction overpotentials. Here we report a novel Cu nanoflower (NF) catalyst with a unique 3D chrysanthemum-like structure. Derived from CuO NFs, the Cu NFs were found to efficiently catalyze the CO 2 reduction with 400 mV lower overpotential than polycrystalline Cu. Besides, H 2 production was suppressed to be below 25% in terms of Faradaic efficiency in a wide potential window, implying an excellent catalytic selectivity. Prolonged electrolysis showed that the Cu NFs kept a high catalytic activity towards CO 2 reduction for over 9 h. In addition, for the first time, the deposition of amorphous carbon on the electrodes after catalysis was directly observed in this study. The reaction pathways of electrocatalytic CO 2 reduction and the involvement of the surface carbon in this process were elucidated. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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