The Heterostructure of Ru P/WO /NPC Synergistically Promotes H O Dissociation for Improved Hydrogen Evolution.

Facilitating the dissociation of water and desorption of hydrogen are both crucial challenges for improving the hydrogen evolution reaction (HER) in alkaline media. Herein, we report the synthesis of heterostructure of Ru P/WO @NPC (N, P co-doped carbon) by a simple hydrothermal reaction using ruthenium and tungsten salts as precursors, followed by pyrolyzing under an Ar atmosphere. The Ru P/WO @NPC electrocatalyst exhibits an outstanding HER activity with an overpotential of 15 mV at a current density of 10 mA cm and excellent durability in a 1.0 M KOH solution, outperforming state-of-the-art Pt/C and most reported electrocatalysts. Experimental results combined with density functional calculations reveal that the electron density redistribution in Ru P/WO @NPC is achieved by electron transfer from NPC to Ru P/WO and from Ru P to WO , which directly promotes the dissociation of water on W sites in WO and desorption of hydrogen on Ru sites in Ru P.