Z-Scheme Photocarrier Transfer Realized in Tungsten Oxide-Based Photocatalysts by Combining with Bismuth Vanadate Quantum Dots
| Autor: | Zemin Zhang, Weihua Han, Xiao Jiang, Xiaolin Jiang, Yinyi Ma, Bo Liu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Photocurrent
Hydrogen 010405 organic chemistry business.industry chemistry.chemical_element 010402 general chemistry 01 natural sciences Redox 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound Semiconductor chemistry Quantum dot Bismuth vanadate Optoelectronics Physical and Theoretical Chemistry business Nanosheet Hydrogen production |
| Zdroj: | Inorganic Chemistry. 60:3057-3064 |
| ISSN: | 1520-510X 0020-1669 |
| Popis: | Multicomponent photocatalysts with a Z-scheme charge transfer are promising in converting solar to hydrogen fuel because of their significantly improved light absorption and restrained photocarrier recombination while keeping their redox capacity. In this work, a composite photocatalyst of BiVO4 quantum dot-decorated WO3 nanosheet arrays was synthesized and investigated. The existence of the Z-scheme charge transfer behavior was confirmed by the redox probe technique. Such a Z-scheme charge transfer makes it possible to generate hydrogen without bias. An optimized photocatalyst produces a hydrogen generation rate of 0.75 μmol/h without bias and a photocurrent of 1.91 mA/cm2 at 1.23 V versus RHE, which is about 70% higher than that of pure WO3. We attributed these improvements to the enhanced light absorption, extended conduction band level of BiVO4, as well as the unique charge transfer behavior in the Z-scheme structure. This work presents a generalizable method to improve the redox capacity of a variety of semiconductors through rationally selecting the building material blocks in view of energy levels. |
| Databáze: | OpenAIRE |
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