|
ИСТИНА |
Войти в систему Регистрация |
ИПМех РАН |
||
Improving the lifetime of hybrid CoPc@MWCNT catalysts for selective electrochemical CO2-to-CO conversionстатья Исследовательская статья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Changzhe Sun, Hou Yuhui, Lüdi Nicola, Hu Huifang, de Jesús Gálvez-Vázquez María, Liechti Mike, Kong Ying, Liu Menglong, Erni Rolf, Rudnev Alexander V., Broekmann Peter
- Журнал: Journal of Catalysis
- Том: 407
- Год издания: 2022
- Издательство: Academic Press
- Местоположение издательства: United States
- Первая страница: 198
- Последняя страница: 205
- DOI: 10.1016/j.jcat.2022.02.001
- Аннотация: Molecular hybrid catalysts, such as cobalt(II) phthalocyanine (CoPc) complexes anchored to multi-walled carbon nanotubes (MWCNTs), provide selective CO2 conversion toward CO with high current densities, exceeding 0.1 A cm−2 in microfluidic or zero-gap (membrane) electrolyzers. However, the practicality of CO2 electroreduction is essentially determined by the catalyst stability against mechanical and (electro)chemical degradation. Here, we report a new mechanism for the observable degradation of the CoPc@MWCNT hybrid catalyst. Even at moderate CO2 reduction potentials, the demetalation of CoPc complexes is induced by a reduction of iron (Fe) species, which can contaminate commercially available MWCNTs or solvents used for catalyst preparation. Minimization of Fe contamination leads to a substantial improvement in the CoPc@MWCNT catalyst lifetime, with the faradaic efficiency of CO formation decreasing from 98% to 96% (by only 2%) after 95 h of electrolysis. Thus, careful purification of hybrid catalyst materials is required to maintain initial levels of catalyst performance during long-term operation.
- Добавил в систему: Руднев Александр Викторович