Efficient Photoelectrochemical Hydrogen Generation Using Heterostructures of Si and Chemically Exfoliated Metallic MoS2

TitleEfficient Photoelectrochemical Hydrogen Generation Using Heterostructures of Si and Chemically Exfoliated Metallic MoS2
Publication TypeJournal Article
Year of Publication2014
AuthorsDing, Q, Meng, F, English, CR, Caban-Acevedo, M, Shearer, MJ, Liang, D, Daniel, AS, Hamers, RJ, Jin, S
JournalJournal of the American Chemical Society
Volume136
Pagination8504-8507
Date PublishedJun
ISBN Number0002-7863
KeywordsARRAY PHOTOCATHODES, CATALYSTS, CONVERSION, ELECTROCATALYSTS, ELECTRODES, EVOLUTION REACTION, GRAPHENE, NANOSHEETS, PHOTOVOLTAGE, SILICON PHOTOCATHODE
Abstract

We report the preparation and characterization of highly efficient and robust photocathodes based on heterostructures of chemically exfoliated metallic 1T-MoS2 and planar p-type Si for solar-driven hydrogen production. Photocurrents up to 17.6 mA/cm(2) at 0 V vs reversible hydrogen electrode were achieved under simulated 1 sun irradiation, and excellent stability was demonstrated over long-term operation. Electrochemical impedance spectroscopy revealed low charge-transfer resistances at the semiconductor/catalyst and catalyst/electrolyte interfaces, and surface photoresponse measurements also demonstrated slow carrier recombination dynamics and consequently efficient charge carrier separation, providing further evidence for the superior performance. Our results suggest that chemically exfoliated 1T-MoS2/Si heterostructures are promising earth-abundant alternatives to photocathodes based on noble metal catalysts for solar-driven hydrogen production.

URL<Go to ISI>://WOS:000337720200005
Short TitleJ. Am. Chem. Soc.