Investigation of the Electric Structures of Heterointerfaces in Pt- and In2S3-Modified CuInS2 Photocathodes Used for Sunlight-Induced Hydrogen Evolution

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• 作者：Gunawan ; Wilman Septina ; Takashi Harada ; Yoshitaro Nose ; Shigeru Ikeda
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：July 29, 2015
• 年：2015
• 卷：7
• 期：29
• 页码：16086-16092
• 全文大小：410K
• ISSN：1944-8252

文摘

Copper indium disulfide (CuInS₂) modified with an In₂S₃ layer and a Pt catalyst showed a more efficient photoelectrochemical (PEC) property for hydrogen evolution from a nearly neutral (pH 6) 0.2 M NaH₂PO₄ solution under simulated sunlight illumination (AM 1.5G) than that of a CuInS₂ electrode modified with a CdS layer and a Pt catalyst. Analysis of the PEC properties of In₂S₃-modified CuInS₂ (In₂S₃/CuInS₂) and CdS-modified CuInS₂ (CdS/CuInS₂) in solutions containing an electron scavenger (Eu³⁺) showed identical enhancement of the PEC properties of In₂S₃/CuInS₂ when compared to those of CdS/CuInS₂, indicating the formation of a favorable heterointerface in In₂S₃/CuInS₂ for efficient charge separation. Spectroscopic evaluation of conduction band offsets revealed that In₂S₃/CuInS₂ had a notch-type conduction band offset, whereas a cliff-type offset was formed in CdS/CuInS₂: these results also revealed a better interface electric structure of In₂S₃/CuInS₂ than that of CdS/CuInS₂.