The Dual-Function of GSH for Enhancing the CdS PEC Performance via Constructing Inorganic-Organic Hybrid Heterojunction and Organic Cocatalyst

Finding a restful method to ameliorate the shortcoming of slow charge separation and narrow light absorption range in CdS photoanodes is a significant challenge in photoelectrochemical (PEC) water splitting. Thus, we firstly prepared the CdS/GSH film via hydrothermal method and solution adhesion method for revealing the dual-function of GSH adhesion for advancing the PEC performance of CdS via constructing inorganic-organic hybrid heterojunction and organic cocatalyst. The construction of CdS/GSH inorganic-organic hybrid heterojunction could suppress the carrier separation because the built-in electric field between heterojunction. Moreover, the adhesion of GSH effectively widens the visible light response ability of CdS. Furthermore, the abundant -OH in GSH play a role of cocatalyst because it is easy oxidized by photo-generated holes so as to lifting surface reaction kinetics. As except, the photocurrent density of 0.4 g GSH in solution for CdS/GSH heterojunction (CdS/GSH-4) is 1.48 mA/cm(2) at 1.23 V vs. RHE, which is 4.3 times that of CdS. Moreover, the carriers separation efficiency in surface and bulk is 1.71 and 1.68 times as much as CdS. Our detail research may create a bright tactics for designing and manufacturing a promising photoanode for PEC water splitting. [GRAPHICS] .

Automated summary

In this study, a CdS/GSH film was prepared using hydrothermal and solution adhesion methods, and it was found that GSH adhesion can improve the photoelectrochemical performance of CdS by enhancing carrier separation efficiency and expanding visible light response ability.