In situcoupling of CoP with MoO2for enhanced hydrogen evolution

The development of highly active and stable catalysts based on low-cost materials for the hydrogen evolution reaction (HER) is crucial to catalytic water splitting. In this work, we report on using molybdenum trioxide as an intermediary toin situsynthesize strongly coupled porous CoP/MoO(2)hybrid thin films for the HER. By virtue of modulating the H2O adsorption energy on the surface of CoP, together with the abundant and accessible active sites derived from thein situformation of a porous structure, the as-prepared CoP/MoO(2)hybrid thin films exhibit an excellent HER catalytic performance, only requiring a small overpotential of 41 mV to support a current density of 20 mA cm(-2), which is comparable to the catalytic performance of the Pt/C benchmark.