期刊
CHEMSUSCHEM
卷 9, 期 4, 页码 409-415出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201500872
关键词
catalysis; cobalt oxide; endotemplating; exotemplating; water oxidation
资金
- MAXNET Energy consortium of the Max Planck Society
- Cluster of Excellence RESOLV - Deutsche Forschungsgemeinschaft (DFG) [EXC 1069]
- Fonds der Chemischen Industrie (FCI)
Mesoporous Co3O4 was prepared using a dual templating approach whereby mesopores inside SiO2 nanospheres, as well as the void spaces between the nanospheres, were used as templates. The effect of calcination temperature on the crystallinity, morphology, and textural parameters of the Co3O4 replica was investigated. The catalytic activity of Co3O4 for photochemical water oxidation in a [Ru(bpy)(3)](2+)[S2O8](2-) system was evaluated. The Co3O4 replica calcined at the lowest temperature (150 degrees C) exhibited the best performance as a result of the unique nanostructure and high surface area arising from the dual templating. The performance of Co3O4 with highest surface area was further examined in electrochemical water oxidation. Superior activity over high temperature counterpart and decent stability was observed. Furthermore, CoO with identical morphology was prepared from Co3O4 using an ethanol reduction method and a higher turnover-frequency number for photochemical water oxidation was obtained.
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