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Photocatalytic hydrogen evolution from water offers an attractive avenue to address the increasing demand for energy and associated environmental concerns.Red phosphorus(red P)is recently reported as a visible-light-driven photocatalyst for hydrogen formation.1 However,the low efficiency limits its practical application.An effective way to enhance the photocatalytic activity is to load a cocatalyst on red phosphorus to reduce the recombination of photogenerated electrons and holes.Recently,nickel phosphide(Ni2P)was found to be an excellent noble-metal-free electrocatalyst for hydrogen evolution reaction.2 We are thus interested to integrate Ni2P into photocatalytic systems to explore whether this material could facilitate photocatalytic hydrogen evolution.Herein,we use a simple hydrothermal method to prepare P-Ni2P composite.In this method,nickel sulfate was added into a red P suspension.Ni2P was in situ synthesized under hydrothermal conditions and deposited on the surface of unreacted red P.The formation of Ni2P crystals was confirmed by XRD,HRTEM.The obtained P-Ni2P composite showed a significant enhancement of hydrogen production activity,which is about 2 times higher than that of 1wt%Pt loaded red P.In this composite,Ni2P was proposed to act as a cocatalyst to facilitate the separation of photogenerated electrons and holes from red P.