Citation: Wei Zhong, Dan Zheng, Yuanxin Ou, Aiyun Meng, Yaorong Su. Simultaneously Improving Inter-Plane Crystallization and Incorporating K Atoms in g-C₃N₄ Photocatalyst for Highly-Efficient H₂O₂ Photosynthesis[J]. Acta Physico-Chimica Sinica, ;2024, 40(11): 240600. doi: 10.3866/PKU.WHXB202406005 shu

Simultaneously Improving Inter-Plane Crystallization and Incorporating K Atoms in g-C₃N₄ Photocatalyst for Highly-Efficient H₂O₂ Photosynthesis

Wei Zhong ^† ,
Dan Zheng ^† ,
Yuanxin Ou ,
Aiyun Meng ^, ,
Yaorong Su ^,

College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, Guangdong Province, China

Corresponding author: Aiyun Meng, mengaiyun@sztu.edu.cn Yaorong Su, suyaorong@sztu.edu.cn
Received Date: 5 June 2024
Revised Date: 16 July 2024
Accepted Date: 17 July 2024
Available Online: 2 August 2024
Fund Project: the National Natural Science Foundation of China 22178224the National Natural Science Foundation of China 22272110Guangdong Basic and Applied Basic Research Foundation 2023A1515110535Guangdong Basic and Applied Basic Research Foundation 2020A1515110873Shenzhen Science and Technology Program RCBS20231211090522041the Fundamental Research Funds for Shenzhen Technology University 20211063010047Shenzhen Key Laboratory of Applied Technologies of Super-Diamond and Functional Crystals ZDSYS20230626091303007Shenzhen Science and Technology Program 20231127203830001

Graphitic carbon nitride (g-C₃N₄) has gained growing attention in hydrogen peroxide (H₂O₂) photosynthesis, but the low activity of two-electron oxygen reduction reaction (2e^--ORR) still restricts its photocatalytic H₂O₂-generation performance. Herein, traditional g-C₃N₄ photocatalysts are recrystallized on KI crystal surfaces by a secondary calcination route to synthesize K incorporated highly-crystalline g-C₃N₄ photocatalysts. The synthesized CN-K photocatalyst exhibits improved inter-plane crystallization, narrowed bandgap structure, and smaller particle size from 20 to 50 nm. Moreover, the incorporated K atoms, as excellent catalytic sites, can enhance O₂ adsorption and stabilize the *OOH intermediates, thus improving the 2e^--ORR activity of the K incorporated high-crystallization g-C₃N₄ photocatalysts. Consequently, the optimized CN-K(1:6) photocatalyst exhibits a remarkably improved H₂O₂-generation rate of 7.8 mmol·L^-1·h^-1 with an AQE value of 5.17% at 420 nm, outperforming the traditional g-C₃N₄ sample by a factor of 220. This work uncovers the roles of heteroatoms in promoting the 2e^--ORR selectivity of the g-C₃N₄ photocatalyst, and offers novel insights to construct highly-active g-C₃N₄-based materials for H₂O₂ photosynthesis.
- Photocatalytic H₂O₂ evolution,
- Carbon nitride,
- K incorporation,
- Highly-selective 2e^--ORR
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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

Simultaneously Improving Inter-Plane Crystallization and Incorporating K Atoms in g-C3N4 Photocatalyst for Highly-Efficient H2O2 Photosynthesis

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通讯作者: 陈斌, bchen63@163.com

Simultaneously Improving Inter-Plane Crystallization and Incorporating K Atoms in g-C₃N₄ Photocatalyst for Highly-Efficient H₂O₂ Photosynthesis