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

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

一维/二维W₁₈O₄₉/多孔g-C₃N₄梯形异质结构建及其光催化析氢性能研究

黄悦 ^{1, †,} ,
梅飞飞 ^{1, †,} ,
张金锋 ^{1,
,} ,
代凯 ^{1,
,} ,
DawsonGraham ^2,

1.
淮北师范大学，污染物敏感材料与环境修复安徽省重点实验室，安徽淮北 235000
2.
西交利物浦大学化学系，江苏苏州 215123

通讯作者: 张金锋, jfzhang@chnu.edu.cn
代凯, daikai940@chnu.edu.cn

基金项目:
国家自然科学基金 51572103

国家自然科学基金 51973078

安徽省杰出青年基金 1808085J14

安徽省教育厅重大项目 KJ2020ZD005

摘要: 提高光催化分解水制氢的效率是能量转换领域的关键挑战。本研究首先合成了二维多孔氮化碳(PCN)，然后在二维PCN上原位生长了一维W₁₈O₄₉ (WO)，形成了一种新型的梯形(S型)异质结。该异质结可以加快界面电荷的分离和转移，赋予WO/PCN体系更好的氧化还原能力。此外，具有多孔结构的PCN提供了更多的催化活性位点。与WO和PCN相比，20% WO/PCN复合材料具有更高的H₂产率(1700 μmol·g^-1·h^-1)，是PCN (30 μmol·g^-1·h^-1)的56倍。本研究提供了一种新S型光催化剂用于光催化制氢领域。

关键词:

English

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

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
^†These authors contributed equally to this work.

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

Received Date: 19 August 2021
Accepted Date: 04 September 2021
Revised Date: 30 August 2021
Available Online: 15 July 2022
Fund Project:

Abstract: 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.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

一维/二维W₁₈O₄₉/多孔g-C₃N₄梯形异质结构建及其光催化析氢性能研究

通讯作者: 张金锋, jfzhang@chnu.edu.cn
代凯, daikai940@chnu.edu.cn

English

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

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

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一维/二维W18O49/多孔g-C3N4梯形异质结构建及其光催化析氢性能研究

通讯作者: 张金锋, jfzhang@chnu.edu.cn 代凯, daikai940@chnu.edu.cn

English