Enhancing the photoelectrochemical performance of p-silicon through TiO_(2)coating decorated with mesoporous MoS_(2)  

作　　者：Hongmei WU Feng LI Yanqi YUAN Jing LIU Liping ZHAO Peng ZHANG Lian GAO 

机构地区：[1]School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Frontiers in Energy》2021年第3期772-780,共9页能源前沿（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant Nos.51672174,51779139,51772190,and 51972210);the Advanced Energy Material and Technology Center of Shanghai Jiao Tong University,China.

摘　　要：MoS_(2)is a promising electrocatalyst for hydrogen evolution reaction and a good candidate for cocatalyst to enhance the photoelectrochemical(PEC)performance of Si-based photoelectrode in aqueous electrolytes.The main challenge lies in the optimization of the microstructure of MoS_(2),to improve its catalytic activity and to construct a mechanically and chemically stable cocatalyst/Si photocathode.In this paper,a highly-ordered mesoporous MoS_(2)was synthesized and decorated onto a TiO_(2)protected p-silicon substrate.An additional TiO_(2)necking was introduced to strengthen the bonding between the MoS_(2)particles and the TiO_(2)layer.This meso-MoS_(2)/TiO_(2)/p-Si hybrid photocathode exhibited significantly enhanced PEC performance,where an onset potential of+0.06 V(versus RHE)and a current density of-1.8 mA/cm^(2)at 0 V(versus RHE)with a Faradaic efficiency close to 100%was achieved in 0.5 mol/L H_(2)SO_(4).Additionally,this meso-MoS_(2)/TiO_(2)/p-Si photocathode showed an excellent PEC ability and durability in alkaline media.This paper provides a promising strategy to enhance and protect the photocathode through high-performance surface cocatalysts.

关 键 词：PHOTOELECTROCATALYSIS hydrogen evolution Si photocathode mesoporous MoS_(2) 

分 类 号：O643.36[理学—物理化学]