| Insights into the efficient charge separation over Nb2O5/2D-C3N4 heterostructure for exceptional visible-light driven H2 evolution |
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| 作者姓名： | Jia Yan Ting Wang Siyao Qiu Zhilong Song Wangqin Zhu Xianhu Liu Jiabiao Lian Chenghua Sun Huaming Li |
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| 作者单位： | Key Laboratory of Zhenjiang;Nanyang Environment and Water Research Institute（NEWRI）;College of Chemical Engineering and Energy Technology;Key Laboratory of Materials Processing&Mold（Zhengzhou University）;Department of Chemistry and Biotechnology |
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| 基金项目： | Finacial support from the Natural Science Foundation of Jiangsu Province(BK20170549,BK20180887);the National Natural Science Foundation of China(21706103,62004084);Guangdong Innovation Research Team for Higher Education(2017KCXTD030);the High-level Talents Project of Dongguan University of Technology(KCYKYQD2017017);the Young Talent Cultivation Plan of Jiangsu University;Jiangsu Provincial Program for High-Level Innovative and Entrepreneurial Talents Introduction。 |
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| 摘 要： | Two-dimensional carbon nitride(2 D-C3 N4)nanosheets are promising materials in photocatalytic water splitting,but still suffer from easy agglomeration and fast photogene rated electron-hole pairs recombination.To tackle this issue,herein,a hierarchical Nb2 O5/2 D-C3 N4 heterostructure is precisely constructed and the built-in electric field between Nb2O5 and 2 D-C3 N4 can provide the driving force to separate/transfer the charge carriers efficiently.Moreover,the strongly Lewis acidic Nb2O5 can adsorb TEOA molecules on its surface at locally high concentrations to facilitate the oxidation reaction kinetics under irradiation,resulting in efficient photogene rated electrons-holes separation and exceptional photocatalytic hydrogen evolution.As expected,the champion Nb2O5/2 D-C3N4 heterostructure achieves an exceptional H2 evolution rate of 31.6 mmol g-1 h-1,which is 213.6 times and 4.3 times higher than that of pristine Nb2O5 and2 D-C3N4,respectively.Moreover,the champion heterostructure possesses a high apparent quantum efficiency(AQE)of 45.08%atλ=405 nm and superior cycling stability.Furthermore,a possible photocatalytic mechanism of the energy band alignment at the hetero-interface is proposed based on the systematical characterizations accompanied by density functional theory(DFT)calculations.This work paves the way for the precise construction of a high-quality heterostructured photocatalyst with efficient charge separation to boost hydrogen production.
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| 关 键 词： | Interfacial engineering Nb2O5/2D-C3N4heterostructure Energy band alignment Hydrogen production Density functional theory |
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