Accelerated mass/electron transfer by self-supporting Ni2P@Cu3P heterostructure array to boost alkaline hydrogen evolution at high current density

A non-precious Ni2P@Cu3P heterostructure constructed by in-situ phase conversion is developed as an electrochemical HER catalyst. The strong electron interaction between the Ni2P and Cu3P causes a redistribution of the charge density and the Ni2P@Cu3P heterostructure displays a more moderate free energy, which leads to an enhanced HER activity with an overpotential of 279 mV, an excellent long-term stability and durability at 1000 mA·cm−2.