Journal
CHEMICAL ENGINEERING JOURNAL
Volume 423, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130231
Keywords
Charge separation; Electronic properties; Hetero-interface site; Hydrogen evolution reaction; Photoelectrocatalysis
Categories
Funding
- Fundamental Research Funds for the Central Universities [2020XZZX002-07]
- Zhejiang Provincial Natural Science Foundation of China [LR17B060003]
- Natural Science Foundation of China [21776248, 21676246]
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In this study, a Ru-MoS2 heterostructured catalyst was designed to address the challenges of low charge-separation efficiency and catalytic hydrogen evolution activity in photoelectrochemical water splitting for hydrogen evolution reaction. The engineered electronic structure of Ru-MoS2 significantly decreased charge transfer resistance and optimized electron transportation and Gibbs free energy of hydrogen adsorption, leading to enhanced catalytic HER efficiency. The n+p-Si/Ti/Ru-MoS2 photocathode demonstrated the largest reported photocurrent density for Si-based photocathodes and achieved a high solar-to-hydrogen conversion efficiency.
Photoelectrochemical water splitting for hydrogen evolution reaction (PEC-HER) is always challenged by the low charge-separation efficiency and catalytic hydrogen evolution activity. Herein, we designed a Ru-MoS2 heterostructured catalyst on a titanium (Ti) protecting p-type silicon (n+p-Si) to address these obstacles. The n+p-Si/Ti/ Ru-MoS2 delivers the largest reported photocurrent density for the Si-based photocathode (-43 mA cm-2 at 0 V versus a reversible hydrogen electrode (VRHE)). A considerably high half-cell solar-to-hydrogen conversion efficiency (HC-STH) of 7.28% is achieved at 0.2 VRHE. The excellent performance of n+p-Si/Ti/Ru-MoS2 is benefited from the electronic properties of Ru-MoS2 that dramatically decrease charge transfer resistance, and enhance the built-in electric field at the photoelectrode/electrolyte interface for the charge separation. Significantly, the density functional theory (DFT) calculation further reveals that the engineered electronic structure of the Ru-MoS2 contributes to the improvements in catalytic HER efficiency by optimizing electron transportation and Gibbs free energy of hydrogen adsorption (Delta GH*) on hetero-interface sites.
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