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Oxygen vacancy enriched and Cu single-atom contained covalent organic frameworks: A competitive photocatalyst to promote hydrogen evolution under visible light
被引:0
|作者:
Qiu, Zhishi
[1
]
Luo, Zhongge
[2
]
Zhou, Tong
[1
]
Zi, Baoye
[2
]
Chen, Mingpeng
[2
]
Hu, Rui
[2
]
Lv, Tianping
[2
]
He, Tianwei
[2
]
Ma, Yuxiang
[2
]
Zhang, Jin
[2
]
Cui, Hao
[3
]
Zhao, Jianhong
[4
]
Zhang, Yumin
[2
]
Liu, Qingju
[2
]
机构:
[1] Institute of International Rivers and Eco-security, Yunnan University, Kunming,650091, China
[2] Yunnan Key Laboratory for Micro/Nano Materials & Technology, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming,650091, China
[3] Yunnan Precious Metals Laboratory Co., Ltd, Kunming,650106, China
[4] Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Kunming,650091, China
来源:
关键词:
Activation energy;
D O I:
10.1016/j.mtener.2024.101750
中图分类号:
学科分类号:
摘要:
Single-atom loaded covalent organic frameworks (COFs) have been rapidly developed in the field of photocatalytic hydrogen production in recent years. Despite the insufficient active sites has been introduced, the high recombination rate of photogenerated carriers has hindered the progress of catalyst development. In this work, a novel approach is proposed to construct oxygen vacancies (OVs) on single atom Cu contained COF-TpPa, acting as an electron collector to facilitate the transfer and utilization of electrons. The Cu-OV-TpPa can provide a remarkable H2 production rate of 2.77 mmol g−1 h−1 under visible light, which is 2.6 times of Cu-P-TpPa (a H2 production rate of 1.02 mmol g−1 h−1). It achieves a high apparent quantum efficiency (AQE) of 20 % at 420 nm with no noble metal cocatalyst. A thorough analysis of carrier lifetime, recombination rate, electric conductivity and charge density reveals that the synergistic effect between OVs and single-atom Cu significantly enhances photogenerated carrier separation efficiency and reduces activation energy. This study presents a new strategy to design COF-based photocatalysts towards a competitive H2 production under visible light. © 2024
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