Recent Trends and Developments in Transition Metal Dichalcogenide Photoelectrodes for Solar-to-Hydrogen Conversion

[+] Author and Article Information
Prabhakar Vattikuti S.V.

School of Mechanical Engineering, Yeungnam University, Gyeongsan 712-749, South Korea

1Corresponding author.

ASME doi:10.1115/1.4039458 History: Received November 30, 2017; Revised February 18, 2018


The design of efficient devices for the photoelectrochemical (PEC) water splitting for solar-to-hydrogen processes has gained much attention because of the fossil fuels crisis. In PEC water splitting, solar energy is converted to a chemical fuel for storage. From the viewpoint of economics and large-scale application, semiconductor photoelectrodes with high stability and efficiency are required. However, although numerous materials have been discovered, challenges remain for their commercialization. Among the enormous number of investigated materials, layered transition metal dichalcogenide (TMD)-based photoelectrodes show attractive performance in PEC devices owing to their suitable narrow bandgaps, high absorption capacity, and fast carrier transport properties. A comprehensive review of transition metal dichalcogenide (TMDs) photoelectrodes for solar-to-hydrogen processes would help advance research in this expanding research area. This review covers the physicochemical features and latest progress in various layered-structure TMD-based photoelectrodes, especially MoS2, as well as various approaches to improve the PEC performance and stability by coupling with active carbon materials, including graphene, CNTs, and conductive carbon. Finally, we discuss the prospects and potential applications for solar-to-hydrogen processes. This review article gives insights into the fundamental concepts and the role of active chemical species during the solar-to-hydrogen conversion processes and their influence in enhancing PEC water splitting performance.

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