Ni doping to improve the cocatalytic activity of MoS2 cocatalyst for ZnIn2S4 photocatalytic H2 production and toxic Cr(Ⅵ)reduction
The Gibbs free energy of H+adsorption on transition metal sulfide MoS2 is close to zero,considered to be a promising cocatalyst for hydrogen production.However,the limited exposure of the active sites of MoS2 cocatalyst limits the activity.In this work,Ni-BDC microspheres was chosen as Ni sources and templates to synthesize nickel doped MoS2 cocatalyst via a hydrothermal method.The cocatalyst can significantly improve the photocatalytic hydrogen evolution activity of ZnIn2S4.The optimized photocatalyst(labelled as NMS/ZIS-10)exhibits the highest hydrogen evolution rate of 4.17 mmol/(g·h),which is 12.26 times and 2.72 times of pure ZnIn2S4 and MoS2/ZnIn2S4 photocatalysts,respectively.In addition,NMS/ZIS-10 also exhibits significantly en-hanced toxic Cr(Ⅵ)reduction activity due to the promoted charge separation.The excellent photocatalytic per-formance of Ni-MoS2/ZnIn2S4 is mainly due to the increase of active sites caused by Ni doping,the enhancement of light absorption ability,the improvement of charge carrier separation,and the extension of electronic life-time.The results of this study provide valuable references for optimizing the design of high-performance Mo based co catalysts.
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