p‐CuInS 2 /n‐Polymer Semiconductor Heterojunction for Photoelectrochemical Hydrogen Evolution
| Autor: | Myeongjae Lee, Bongsoo Kim, Jeong Ho Cho, Oh-Shim Joo, Sang Youn Chae, Min Je Kim |
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| Rok vydání: | 2020 |
| Předmět: |
Photocurrent
Materials science business.industry General Chemical Engineering Analytical chemistry Heterojunction 02 engineering and technology Photoelectrochemical cell 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Dielectric spectroscopy General Energy Semiconductor Environmental Chemistry General Materials Science 0210 nano-technology p–n junction business HOMO/LUMO Hydrogen production |
| Zdroj: | ChemSusChem. 13:6651-6659 |
| ISSN: | 1864-564X 1864-5631 |
| DOI: | 10.1002/cssc.202002123 |
| Popis: | An inorganic p-type CuInS2 semiconductor was combined with the semiconducting polymer of PNDI3OT-Se1 and PNDI3OT-Se2 with different HOMO/LUMO levels for photoelectrochemical hydrogen production. Charge transfer behaviors at polymer/CuInS2 junctions were investigated by electrochemical impedance spectroscopy. The heterojunction of p-CuInS2 and n-type polymer (both PNDI3OT-Se1 and Se2) successfully made p-n junctions and showed improved charge transfer. However, we found that higher HOMO levels of polymer than valence band maximum (VBM) of CuInS2 spurred charge recombination at interfaces. As a result, CuInS2 /PNDI3OT-Se1/TiO2 /Pt, which has suitable energy levels matched between PNDI3OT-Se1 and CuInS2 , shows photocurrent (-15.67 mA cm-2 ) improved concretely when compared to a CuInS2 /TiO2 /Pt photoelectrode (-7.11 mA cm-2 ) at 0.0 V vs. RHE applied potential. Additionally, the photoelectrochemical stability of CuInS2 /PNDI3OT-Se1/TiO2 /Pt photoelectrode was also investigated. |
| Databáze: | OpenAIRE |
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