کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6455382 | 1419757 | 2017 | 10 صفحه PDF | دانلود رایگان |
- Hollow polyhedral nanocages Cu-ZIF-400, CuO/Co3O4 and Co3O4 catalysts are synthesized.
- Three catalysts are obtained by modifying cobalt oxides with Cu using different methods.
- All catalysts perform effective activities in electro/photocatalytic water oxidation.
- Cu-ZIF-400 acts as the best electro/photocatalytic catalyst for oxygen evolution reaction.
Cobalt oxides have been modified with Cu using different methods to obtain the catalysts of Cu-ZIF-400 (copper-doped cobalt oxide), CuO/Co3O4 and Co3O4 with identical morphology of hollow polyhedral nanocages. These catalysts were investigated simultaneously for electrocatalytic and photocatalytic water oxidation for the first time. Among them, Cu-ZIF-400 can act as the best electrochemical water oxidation catalyst with a low oxygen evolution reaction (OER) overpotential of 342Â mV at 10.0Â mAÂ cmâ2 in alkaline electrolyte. At the same time, a high turnover frequency (TOF) of 2.1Â ÃÂ 10â3Â sâ1 per metal atom was obtained over Cu-ZIF-400 at neutral conditions, which is comparable to those documented cobalt based catalysts. The different performances of catalysts can be attributed to the different doping methods. We hypothesize that the electrophilic Cu2+ makes the Co more electron-drawing and facilitates the nucleophilic addition of water, which enhanced OER activity of Cu-ZIF-400 catalyst.
89
Journal: Journal of Catalysis - Volume 352, August 2017, Pages 246-255