期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 22, 期 39, 页码 14029-14035出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201602618
关键词
carbon dioxide valorization; copper; electrocatalysis; nanoparticles; surface chemistry
资金
- French National Research Agency (ANR) [Carbiored ANR-12-BS07-0024-03]
- French National Research Agency (Labex program ARCANE) [ANR-11-LABX-0003-01]
- French National Research Agency (DYNAMO) [ANR-11-LABX-0011]
- Fondation de l'Orangerie for Individual Philanthropy
Copper/copper oxide (Cu/Cu2O) electrodes are known to display interesting electrocatalytic performances for the reduction of CO2, and thus, deserve further investigation for optimization. Here, we show that the addition of nitrogen-based organic additives greatly improves the activity of these electrodes (higher current densities, greater selectivity, and higher faradaic yields). The best effector is found to be tetramethyl cyclam. For example, electrolysis at -2.0 V versus Fc(+)/Fc in CO2-saturated DMF/H2O (99: 1, v/v) in the presence of this effector results in formic acid with almost 90% faradaic yield. SEM and XPS analysis of the electrode surface reveals that the organic additive promotes the formation of active Cu-0 nanoparticles from Cu2O during electrolysis. This simple approach provides a straightforward strategy toward the optimization of Cu/Cu2O electrodes.
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