Citation: Yue Huang, Feifei Mei, Jinfeng Zhang, Kai Dai, Graham Dawson. Construction of 1D/2D W₁₈O₄₉/Porous g-C₃N₄ S-Scheme Heterojunction with Enhanced Photocatalytic H₂ Evolution[J]. Acta Physico-Chimica Sinica, ;2022, 38(7): 210802. doi: 10.3866/PKU.WHXB202108028 shu

Construction of 1D/2D W₁₈O₄₉/Porous g-C₃N₄ S-Scheme Heterojunction with Enhanced Photocatalytic H₂ Evolution

Yue Huang ^{1, †} ,
Feifei Mei ^{1, †} ,
Jinfeng Zhang ^1,, ,
Kai Dai ^1,, ,
Graham Dawson ²

1.
Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation, Huaibei Normal University, Huaibei 235000, Anhui Province, China
2.
Department of Chemistry, Xi'an Jiaotong Liverpool University, Suzhou 215123, Jiangsu Province, China

Corresponding author: Jinfeng Zhang, jfzhang@chnu.edu.cn Kai Dai, daikai940@chnu.edu.cn

^†

Received Date: 19 August 2021
Revised Date: 30 August 2021
Accepted Date: 4 September 2021
Available Online: 9 September 2021
Fund Project: the National Natural Science Foundation of China 51572103the National Natural Science Foundation of China 51973078the Distinguished Young Scholar of Anhui Province, China 1808085J14the Major projects of Education Department of Anhui Province, China KJ2020ZD005

Photocatalytic hydrogen production is an effective strategy for addressing energy shortage and converting solar energy into chemical energy. Exploring effective strategies to improve photocatalytic H₂ production is a key challenge in the field of energy conversion. There are numerous oxygen vacancies on the surface of non-stoichiometric W₁₈O₄₉ (WO), which result in suitable light absorption performance, but the hydrogen evolution effect is not ideal because the band potential does not reach the hydrogen evolution potential. A suitable heterojunction is constructed to optimize defects such as high carrier recombination rate and low photocatalytic performance in a semiconductor. Herein, 2D porous carbon nitride (PCN) is synthesized, followed by the in situ growth of 1D WO on the PCN to realize a step-scheme (S-scheme) heterojunction. When WO and PCN are composited, the difference between the Fermi levels of WO and PCN leads to electron migration, which balances the Fermi levels of WO and PCN. Electron transfer leads to the formation of an interfacial electric field and bends the energy bands of WO and PCN, thereby resulting in the recombination of unused electrons and holes while leaving used electrons and holes, which can accelerate the separation and charge transfer at the interface and endow the WO/PCN system with better redox capabilities. In addition, PCN with a porous structure provides more catalytic active sites. The photocatalytic performance of the sample can be investigated using the amount of hydrogen released. Compared to WO and PCN, 20%WO/PCN composite has a higher H₂ production rate (1700 μmol·g^-1·h^-1), which is 56 times greater than that of PCN (30 μmol·g^-1·h^-1). This study shows the possibility of the application of S-scheme heterojunction in the field of photocatalytic H₂ production.
- S-scheme,
- Photocatalytic H₂ production,
- W₁₈O₄₉,
- Porous carbon nitride,
- Heterojunction
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Construction of 1D/2D W18O49/Porous g-C3N4 S-Scheme Heterojunction with Enhanced Photocatalytic H2 Evolution

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通讯作者: 陈斌, bchen63@163.com

Construction of 1D/2D W₁₈O₄₉/Porous g-C₃N₄ S-Scheme Heterojunction with Enhanced Photocatalytic H₂ Evolution