Citation: Tao Sun, Chenxi Li, Yupeng Bao, Jun Fan, Enzhou Liu. S-Scheme MnCo₂S₄/g-C₃N₄ Heterojunction Photocatalyst for H₂ Production[J]. Acta Physico-Chimica Sinica, ;2023, 39(6): 221200. doi: 10.3866/PKU.WHXB202212009 shu

S-Scheme MnCo₂S₄/g-C₃N₄ Heterojunction Photocatalyst for H₂ Production

Tao Sun ^†,, ,
Chenxi Li ^† ,
Yupeng Bao ,
Jun Fan ,
Enzhou Liu ^,

School of Chemical Engineering, Xi'an Key Laboratory of Special Energy Materials, Northwest University, Xi'an, 710069, China

Corresponding author: Tao Sun, chemstst@nwu.edu.cn Enzhou Liu, liuenzhou@nwu.edu.cn

^†

Received Date: 4 December 2022
Revised Date: 2 January 2023
Accepted Date: 3 January 2023
Available Online: 6 January 2023
Fund Project: the National Natural Science Foundation of China 11974276the National Natural Science Foundation of China 22078261Natural Science Basic Research Program of Shaanxi Province, China 2020JM-422Key Science and Technology Innovation Team of Shaanxi Province, China 2022TD-33National Innovation and Entrepreneurship Training Program for College Students, China 202210697148National Innovation and Entrepreneurship Training Program for College Students, China 202210697069Qin Chuangyuan Project of Shaanxi Province, China QCYRCXM-2022-213

The increased global demand for energy and the enhanced deterioration of the environment are the two urgent challenges of the 21st century on the way to sustainable development for human society. Currently, green and renewable energy conversion technology has received much attention as a substitute for limited and non-renewable fossil fuels. Hydrogen energy is advantageous because of its high energy capacity (142 MJ·kg⁻¹) and its production by green conversion technology, consisting of H₂ reacting with O₂ to generate H₂O. It can establish a clean and sustainable hydrogen economic system, as well as reduce the utilization of fossil fuels and carbon dioxide emissions. Water splitting technology is an efficient approach to acquire the featured H₂ energy of the green reaction (2H₂O → 2H₂ + O₂) through electrocatalytic and photocatalytic reactions. Photocatalysis technology, with the advantage of huge solar energy utilization, has been widely regarded as a promising method for the realization of this chemical synthesis. Among photocatalysis technologies, photocatalytic H₂ production from water is considered a promising approach to obtain H₂ energy due to its environmentally friendly energy conversion. However, the effectiveness of acquiring H₂ energy through photocatalytic water splitting is intimately related with photocatalysts. In general, photocatalysts still face the big challenge of their low solar energy utilization efficiency, which restricts the large-scale application of photocatalytic technology to obtain H₂ energy. Thus, developing highly efficient photocatalysts for H₂ production is critical in promoting this technology moving forward, and obtaining renewable energy. Herein, we successfully construct the S-scheme MnCo₂S₄/g-C₃N₄ heterojunction through an expedient physical mixing process at a low temperature, which can be separately obtained via the pyrolysis process and hydrothermal method. The H₂ production rate of MnCo₂S₄/g-C₃N₄ heterojunction can achieve up to 2979 µmol·g⁻¹·h⁻¹, which is 26.4 and 8.7 times higher than those of g-C₃N₄ (113 µmol·g⁻¹·h⁻¹) and MnCo₂S₄ (341 µmol·g⁻¹·h⁻¹), respectively, and presents a superior stability in three continuous cycles during H₂ production tests. The high H₂ production of MnCo₂S₄/g-C₃N₄ heterojunction is mainly ascribed to the following three reasons: i) The light absorption region of the heterojunction is extended to visible light. ii) MnCo₂S₄/g-C₃N₄ possesses low impedance during the reaction, high photocurrent density, and more exposed sites in solution. iii) The efficient reservation of active electron-hole pairs greatly enhances the ratio of electrons reacting with H* species to generate H₂ over MnCo₂S₄/g-C₃N₄ heterojunction. This work provides an efficient approach to constructing advanced g-C₃N₄-based photocatalysts through hybridization with metal sulfides to form S-scheme heterojunctions.
- MnCo₂S₄,
- Carbon nitride,
- S-scheme heterojunction,
- Photocatalytic H₂ production from water splitting
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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

S-Scheme MnCo2S4/g-C3N4 Heterojunction Photocatalyst for H2 Production

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通讯作者: 陈斌, bchen63@163.com

S-Scheme MnCo₂S₄/g-C₃N₄ Heterojunction Photocatalyst for H₂ Production