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Recently, two-dimensional phosphorene (2D BP) has become an ideal material for electrocatalysts due to its short charge transport distance, high carrier mobility and fully exposed surface active sites. However, the inadequate adsorption energy of oxygen-containing intermediates results in the sluggish reaction kinetics, and thus limits its practical application. In this paper, granular amorphous Ni2P on the surface of BP to construct Ni2P@ BP heterostructure were introduced, in order to improve its electrochemical stability and reaction activity. The results show that, compared with the pure BP and Ni2P catalysts, the Ni2P@ BP catalyst exhibits excellent hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) catalytic activities with an overpotential of 167 and 186 mV at a current density of 10 mA/cm², respectively. As a bifunctional electrocatalyst, Ni2P@ BP requires only 1. 54 V applied bias (Vapp) to achieve a current density of 10 mA/cm². Finally, over 7% solar to hydrogen (STH) coversion efficiency is achieved assisting with a-Si:H/a-SiGe:H/ a-SiGe:H triple-junction solar cell, which is 95% higher than that of pure BP as a bifunctional electrocatalyst. [ABSTRACT FROM AUTHOR]

Cd0.5Zn0.5 S nanoparticles and Ni2P nano-lamellar were prepared by precipitation-hydrothermal and low temperature thermal phosphating method,respectively. Low-cost, well-dispersed,efficient non-noble metal phosphide-assisted Ni2 P/Cd0.5Zn0.5 S composites were synthesized by using ultrasonic cavitation effect. The samples were characterized via XRD,SEM, UV-vis, PL, and electrochemical testing. Using Na2S-Na2SO3 as sacrificial agent, the photocatalytic activity of the samples was evaluated under visible light(λ ≥420 nm) irradiation. The results showed that Ni2P significantly improved the photocatalytic hydrogen evolution of Cd0.5Zn0.5 S. For 10% Ni2P/Cd0.5Zn0.5 S, the photocatalytic hydrogen generation rates is 19. 133 mmol/(g • h), which is 2. 4 times higher than that of Cd0.5Zn0.5 S[7. 865 mmol/(g • h)]. Additionally, the hydrogen generation rate keeps 91 % of the initial value after seven photocatalytic cycles, which can be attributed to the fact that the composite material has better light absorption ability and lower band gap, while the active center and interface effect provided by Ni2P effectively promote the rapid migration and effective separation of photo-generated carriers. [ABSTRACT FROM AUTHOR]

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