Atomic-Layer Controlled Interfacial Band Engineering at Two-Dimensional Layered PtSe2/Si Heterojunctions for Efficient Photoelectrochemical Hydrogen Production
| Autor: | Lain-Jong Li, Yi Chou, Cheng Chieh Lin, Cheng-Yen Wen, Ming-Yang Li, Yi-Chia Chou, Chun-Wei Chen, Tien Tien Yeh, Chih-Wei Luo, Wen-Hao Chang, Cheng Chu Chung, Chuan Yu Wei, Chih-I Wu, Chia Shuo Li, Han Yeh, Po Hsien Wu |
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| Rok vydání: | 2021 |
| Předmět: |
Photocurrent
Materials science business.industry General Engineering General Physics and Astronomy Heterojunction 02 engineering and technology Chemical vapor deposition Photoelectrochemical cell 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Photocathode 0104 chemical sciences Monolayer Reversible hydrogen electrode Optoelectronics General Materials Science Thin film 0210 nano-technology business |
| Zdroj: | ACS Nano. 15:4627-4635 |
| ISSN: | 1936-086X 1936-0851 |
| DOI: | 10.1021/acsnano.0c08970 |
| Popis: | Platinum diselenide (PtSe2) is a group-10 two-dimensional (2D) transition metal dichalcogenide that exhibits the most prominent atomic-layer-dependent electronic behavior of "semiconductor-to-semimetal" transition when going from monolayer to bulk form. This work demonstrates an efficient photoelectrochemical (PEC) conversion for direct solar-to-hydrogen (H2) production based on 2D layered PtSe2/Si heterojunction photocathodes. By systematically controlling the number of atomic layers of wafer-scale 2D PtSe2 films through chemical vapor deposition (CVD), the interfacial band alignments at the 2D layered PtSe2/Si heterojunctions can be appropriately engineered. The 2D PtSe2/p-Si heterojunction photocathode consisting of a PtSe2 thin film with a thickness of 2.2 nm (or 3 atomic layers) exhibits the optimized band alignment and delivers the best PEC performance for hydrogen production with a photocurrent density of -32.4 mA cm-2 at 0 V and an onset potential of 1 mA cm-2 at 0.29 V versus a reversible hydrogen electrode (RHE) after post-treatment. The wafer-scale atomic-layer controlled band engineering of 2D PtSe2 thin-film catalysts integrated with the Si light absorber provides an effective way in the renewable energy application for direct solar-to-hydrogen production. |
| Databáze: | OpenAIRE |
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