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

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• 作者：Qi Ding ; Fei Meng ; Caroline R. English ; Miguel Cab谩n-Acevedo ; Melinda J. Shearer ; Dong Liang ; Andrew S. Daniel ; Robert J. Hamers ; Song Jin
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：June 18, 2014
• 年：2014
• 卷：136
• 期：24
• 页码：8504-8507
• 全文大小：277K
• 年卷期：v.136,no.24(June 18, 2014)
• ISSN：1520-5126

文摘

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/cm² 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.