Optimizing Hydrogen Adsorption of Ni B Cocatalyst by Integrating P Atom for Enhanced Photocatalytic H2-production Activity of CdS

Developing low-cost and long-lasting nickel boride (NixB) for hydrogen evolution reaction is desirable to favor the present renewable energy system. However, H atom adsorption on Ni active site is weakened by the electron transfer from B to Ni atom in NixB, causing the inhibited hydrogen-evolution process. Herein, the metalloid P is introduced into NixB to regulate the electron density of Ni active site, with the aim of enhancing its H atom adsorption to boost the photocatalytic H-2-production activity of CdS. In this regard, the NixPB cocatalysts with a size of 8-10 nm are loaded on reduced graphene oxide (rGO) to produce NixPB-rGO cocatalyst, which was well coupled with CdS to prepare the NixPB-rGO/CdS photocatalyst. Photocatalytic hydrogen-evolution tests suggested that the NixPB-rGO/CdS photocatalyst displayed the highest H-2-evolution rate of 5.79 mmol h(-1) g(-1), which is 1.8 and 9.9 times over the NixB-rGO/CdS and rGO/CdS photocatalysts, respectively. The above improved activity of NixPB-rGO/CdS photocatalyst can be attributed to the promoting hydrogen adsorption of Ni atom for efficient interfacial H-2 production via the facile introduction of P heteroatom. This work provides a feasible strategy to optimize the transition metal borides cocatalysts for the photocatalytic H-2 evolution.