Developing a suitable and low-cost co-catalyst is highly desired for promoting photocatalytic water splitting of H₂ production. Herein, we adopted a simple in situ photodeposition strategy by coupling Mn_0.5Cd_0.5S with non-noble co-catalyst Ni₂P to construct Ni₂P/Mn_0.5Cd_0.5S composites and achieved obviously improved H₂ amount (31.83 mmol/h/g) in visible-light region, which is nearly 2.8 times than that of pure Mn_0.5Cd_0.5S. Such photocatalytic performance is in a relatively superior position among Mn_xCd_1−xS-based photocatalysts. The apparent quantum efficiency of Ni₂P/Mn_0.5Cd_0.5S-7 composites reaches 32% at 420 nm. Through optical and photoelectrochemical measurements, a possible mechanism was proposed, it was found that the interface between metalloid Ni₂P and Mn_0.5Cd_0.5S contacts closely, which facilitates transfer and separation of charge carriers, thus promotes the reduction of H⁺ to H₂. This study provides a new design of cut-price, high-efficiency photocatalyst for H₂ evolution.

为了促进H ₂产生的光催化水分解，迫切需要开发合适且低成本的助催化剂。在本文中，我们采用了一种简单的原位光沉积策略，即将Mn _0.5 Cd _0.5 S与非贵金属助催化剂Ni ₂ P偶联以构建Ni ₂ P / Mn _0.5 Cd _0.5 S复合材料，并显着提高了H ₂含量（31.83 mmol / h / g），是纯Mn _0.5 Cd _0.5 S的近2.8倍。这种光催化性能在Mn _x Cd _1-x中处于相对优越的位置S型光催化剂。Ni ₂ P / Mn _0.5 Cd _0.5 S-7复合材料的表观量子效率在420 nm时达到32％。通过光学和光电化学测量，提出了一种可能的机理，发现准金属Ni ₂ P与Mn _0.5 Cd _0.5 S之间的界面紧密接触，从而促进了电荷载流子的转移和分离，从而促进了H ⁺向H的还原。₂。这项研究为H _2的放出提供了一种新的廉价，高效的光催化剂设计。