Two-dimensionalg-GeC/PtSe2van der Waals heterostructure: A Visible light-driven direct Z-scheme photocatalyst for overall water splitting
| Autor: | YH Xue, J.N. Han, Z.H Li, Zhenhua Zhang |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Journal of Physics D: Applied Physics. |
| ISSN: | 1361-6463 0022-3727 |
| DOI: | 10.1088/1361-6463/acd64f |
| Popis: | The vertical stacking of different two-dimensional (2D) materials to construct van der Waals heterostructures (vdWHs) opens up a promising platform for designing high-efficiency photocatalysts. Direct Z-scheme heterostructures for photocatalytic dissociation has received much attention in recent years, in which charge carriers migrate directly between two semiconductors without redox mediators. Here, the electronic and optical properties as well as solar-to-hydrogen (STH) conversion efficiency of g-GeC/ PtSe2 vdWHs are systematically investigated, especially for its high-efficiency visible-light water splitting catalyst features. Calculations show that the g-GeC/ PtSe2 vdWH is a semiconductor with an indirect band gap of 1.356 eV, featuring a type-II band alignment. The built-in electric field Eint and band bending at the interface lead to a direct Z-scheme photocatalytic structure, and photocatalytic water splitting can be realized in the pH range of 0~14. In particular, with biaxial tensile strain ε = 4% applied, the g-GeC/PtSe2 vdWH possesses a smaller band gap, wider visible light response range and very high STH conversion efficiency (ηSTH) up to 49.07%, entirely satisfying the optimal photocatalytic water splitting conditions. This work provides a new perspective for designing of promising direct Z-scheme visible light water splitting catalyst with a high-efficiency solar energy conversion, beneficially to the development of clean energy. |
| Databáze: | OpenAIRE |
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