Citation: Yujin Deng, Yishuang Chen, Lijie Zhang, Huile Jin, Yun Yang, Quanlong Xu, Shun Wang. Plasmonic Au nanobipyramid assembly covalent organic framework for boosting photocatalytic hydrogen evolution through strong local electric field[J]. Acta Physico-Chimica Sinica, ;2026, 42(6): 100193. doi: 10.1016/j.actphy.2025.100193 shu

Plasmonic Au nanobipyramid assembly covalent organic framework for boosting photocatalytic hydrogen evolution through strong local electric field

Yujin Deng ¹ ,
Yishuang Chen ¹ ,
Lijie Zhang ^1,2 ,
Huile Jin ¹ ,
Yun Yang ^1,, ,
Quanlong Xu ^1,, ,
Shun Wang ¹

1.
Wenzhou Key Lab of Advanced Energy Storage and Conversion, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325027, Zhejiang Province, China;
2.
Zhejiang International Joint Laboratory of Optical Functional Materials, Institute of New Materials and Industrial Technology, Wenzhou University, Wenzhou 325027, Zhejiang Province, China

Corresponding author: Yun Yang, Quanlong Xu,
Received Date: 27 August 2025
Revised Date: 20 September 2025
Accepted Date: 23 September 2025

Integrating plasmonic metal nanocrystal/semiconductor hybrids is a novel approach to contribute photocatalyst with high performance. However, a deep insight of activity acceleration remains elusive because of the complex physicochemical behavior of localized surface plasmon resonance (LSPR) effects. Herein, Au nanobipyramids (NBs) capable of strong local electric field (LEF) are precisely synthesized and encapsulated in TpBD-COF via an in situ growth strategy. As expected, the optimized AuNBs/TpBD-COF hybrid displays a remarkable improvement in photocatalytic H₂ generation reaction, with apparent quantum efficiency (AQE) of 0.58% at 420 nm. Electromagnetic simulation and femtosecond transient absorption spectroscopy demonstrate the critical role of amplified local electric field in generating charge-separated excitons and thus yielding more hot carriers (energetic electron/hole pairs) for H₂ evolution in TpBD-COF. These findings provide a deep insight to examine the LSPR effects for improving the COF-based photocatalytic performance.
- Covalent organic frameworks,
- Localized surface plasmon resonance,
- Photocatalytic H2 evolution
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