ACS Applied Materials & Interfaces · 2016 · 53 citations · 22 references
An efficient H<sub>2</sub> evolution catalyst is developed by grafting CoSe<sub>2</sub> nanorods into C<sub>3</sub>N<sub>4</sub> nanosheets. The as-obtained C<sub>3</sub>N<sub>4</sub>-CoSe<sub>2</sub> heterostructure can show excellent performance in H<sub>2</sub> evolution with outstanding durability. To generate phatocathode for photoelectrochemical water splitting CoSe<sub>2</sub> grafted in C<sub>3</sub>N<sub>4</sub> was decorated on the top of p-Si microwires (MWs). p-Si/C<sub>3</sub>N<sub>4</sub>-CoSe<sub>2</sub> heterostructure can work as an efficient photocathode material for solar H<sub>2</sub> production in PEC water splitting. In 0.5 M H<sub>2</sub>SO<sub>4</sub>, p-Si/C<sub>3</sub>N<sub>4</sub>-CoSe<sub>2</sub> can afford photocurrent density -4.89 mA/cm<sup>2</sup> at "0" V vs RHE and it can efficiently work for 3.5 h under visible light. Superior activity of C<sub>3</sub>N<sub>4</sub>-CoSe<sub>2</sub> compared to CoSe<sub>2</sub> toward H<sub>2</sub> evolution is explained with the help of impedance spectroscopy.
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