Investigation of the Electric Structures of Heterointerfaces in Pt- and In2S3-Modified CuInS2 Photocathodes Used for Sunlight-Induced Hydrogen Evolution
Investigation of the Electric Structures of Heterointerfaces in Pt- and In2S3-Modified CuInS2 Photocathodes Used for Sunlight-Induced Hydrogen Evolution
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DOI：
10.1021/acsami.5b04634
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发表时间：
2015-07-29
影响因子：
9.5
通讯作者：
Ikeda, Shigeru
中科院分区：
文献类型：
--
作者：
Gunawan;Septina, Wilman;Ikeda, Shigeru
在模拟太阳光（AM 1.5G）照射下，用In 2S 3层和Pt催化剂修饰的二硫化铟铜（CuInS 2）在近中性（pH 6）的0.2M NaH 2 PO 4溶液中的析氢表现出比用CdS层和Pt催化剂修饰的CuInS 2电极更有效的光电化学（PEC）性能.在含有电子捕获剂（Eu 3+）的溶液中对In 2S 3改性的CuInS 2（In 2S 3/CuInS 2）和CdS改性的CuInS 2（CdS/CuInS 2）的PEC性质的分析表明，与CdS/CuInS 2的PEC性质相比，In 2S 3/CuInS 2的PEC性质具有相同的增强，这表明在In 2S 3/CuInS 2中形成了有利的异质界面，用于有效的电荷分离。导带偏移的光谱评估表明，在In 2S 3/CuInS 2有一个缺口型导带偏移，而悬崖型偏移形成在CdS/CuInS 2：这些结果也揭示了一个更好的界面电结构的In 2S 3/CuInS 2比CdS/CuInS 2。
Copper indium disulfide (CuInS2) modified with art 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.