摘要
Optimizing the hydrogen adsorption on electrodes is one of the most effective strategies to promote the hydrogen evolution reaction (HER). In recent years, cobalt phosphides (CoP) have been identified as a promising catalyst for HER in acid. However, the hydrogen adsorption on CoP is strong and a considerable overpotential has to be applied to enable HER. Here, we report a strategy to weaken the hydrogen adsorption on CoP through an electron deficiency in CoP induced by Au@CoP core/shell structure. A weakened hydrogen adsorption is confirmed by the density functional theory (DFT) calculation. Au@ CoP gave an overpotential (eta) of 160 mV at the current density of 1 mA cm(CoP)(-2), which is about 50 mV less than pure CoP. It also exhibited a turn-over frequency (TOF) value of 0.68 s(-1) per active site at eta= 150 mV, which is more than 4 times higher than CoP. The strategy reported here holds potential to be extended to other electrodes for optimizing their hydrogen adsorption for HER.
- 出版日期2018-8
- 单位北京大学