MgInS is a photocatalyst with a suitable band gap for renewable energy production, but its effectiveness is hindered by pronounced photocorrosion, insufficient surface active sites and rapid charge recombination. Herein, we report the synthesis of CoS/MgInS Ohmic junction with a robust internal electric field. The optimized CoS/MgInS photocatalyst with a CoS loading of 20.5 wt%, depicts a maximum H evolution rate of 290 μmol g h, which is 3.1 times higher than the value of MgInS. The improved photocatalytic activity of CoS/MgInS can be attributed to the intimate Ohmic junction at the CoS/MgInS interface, which promotes effective photoelectron transfer from MgInS to CoS. Simultaneously, CoS can act as an efficient surface cocatalyst, with an optimal hydrogen-adsorption Gibbs free energy, enabling highly efficient proton reduction at the catalyst/HO interface. The present work introduces a novel approach to modulate interfaces, creating transition metal sulfide cocatalysts for photocatalysts, resulting in high photocatalytic performance.

中文翻译：

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了解独特的欧姆结以增强 CoS2/MgIn2S4 产氢的光催化活性

MgInS是一种具有适合可再生能源生产的带隙的光催化剂，但其有效性受到明显的光腐蚀、表面活性位点不足和快速电荷复合的阻碍。在此，我们报告了具有强大内部电场的 CoS/MgInS 欧姆结的合成。优化后的 CoS/MgInS 光催化剂的 CoS 负载量为 20.5 wt%，最大析氢速率为 290 μmol·gh，是 MgInS 值的 3.1 倍。 CoS/MgInS光催化活性的提高可归因于CoS/MgInS界面处的紧密欧姆结，这促进了从MgInS到CoS的有效光电子转移。同时，CoS可以作为一种高效的表面助催化剂，具有最佳的氢吸附吉布斯自由能，从而能够在催化剂/H2O界面上实现高效的质子还原。目前的工作介绍了一种调节界面的新方法，创建用于光催化剂的过渡金属硫化物助催化剂，从而产生高光催化性能。