Semimetallic MoP2: an active and stable hydrogen evolution electrocatalyst over the whole pH range

Abstract

Developing efficient non-precious metal hydrogen evolution reaction (HER) electrocatalysts is a great challenge for sustainable hydrogen production from water. In this communication, for the first time, semimetallic MoP₂ nanoparticle films on a metal Mo plate (MoP₂ NPs/Mo) are fabricated through a facile two-step strategy. When used as a binder-free hydrogen evolution cathode, the as-prepared MoP₂ NPs/Mo electrode exhibits superior HER catalytic activity at all pH values. At a current density of 10 mA cm⁻², the catalyst displays overpotentials of 143, 211 and 194 mV in 0.5 M H₂SO₄, 1.0 M phosphate buffer solution and 1.0 M KOH, respectively. Furthermore, it exhibits excellent stability over a wide pH range. Thus, this in situ route opens up a new avenue for the fabrication of highly efficient, cost-effective and binder-free non-precious catalysts for water splitting and other electrochemical devices.