Synergistic Effect of Nitrogen-doped CdIn₂S₄(Vs) and Andersontype Polyoxometalate on Enhanced Photocatalytic Hydrogen Production

Abstract

The development of clean and sustainable energy technologies represents a critical focus in contemporary scientific research. In this study, we construct an efficient photocatalytic hydrogen evolution system using nitrogendoped, sulfur vacancy CdIn₂S₄ as the catalyst and (NH 4 ) 4 [NiMo 6 O 24 H 6 ]•5H 2 O (NiMo₆) as co-catalyst. Among all synthesized catalysts, the NiMo₆/10N-CdIn₂S₄(Vs) composite exhibits superior photocatalytic hydrogen evolution activity, achieving an exceptional production rate of 30.88 mmol•g⁻¹•h⁻¹, which is the highest activity among CdIn₂S₄-based systems. Ndoping and S-vacancies boost the light absorption and charge separation of CdIn₂S₄, while the polyoxometalate (POM) further enhances performance by facilitating electron transfer in the system, minimizing recombination of charge carriers and increasing stability of the photocatalytic system.