Oxygen-vacancy engineering approach to bismuth basic nitrate/g-C3N4 heterostructure for efficiently photocatalytic hydrogen evolution. (26th July 2021)

• Record Type: Journal Article
• Authors: Sun, Shichang; Zhou, Weiming; Wang, Lingyi; Zhang, Mingxin; Lawan, Ibrahim; Wang, Liwei; Zhang, Fan; Lin, Ming; Yuan, Zhanhui
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 51(2021)
• Page Start: 25832
• Page End: 25842
• Publication Date: 2021-07-26
• Subjects: Bi6O6(OH)3(NO3)3·1.5H2O/g-C3N4 -- Composite photocatalyst -- Oxygen vacancy defect -- Heterostructure -- H2 evolution; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.05.098
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Formation of oxygen vacancy is emerging as one type of promising defect engineering in the preparation of inorganic functional composites. In this work, a novel composite upon the calcination of the nanosheets Bi6 O6 (OH)3 (NO3 )3 ·1.5H2 O (BBN) and g-C3 N4 was prepared. A large amount of oxygen vacancies was revealed by electron spin resonance (ESR) and Raman spectroscopy. These intriguing structural characters render the as-prepared composite with excellent interfacial charge transfer and photo-stimulated response as shown by electrochemical impedance spectroscopy (EIS) and photocurrent measurement. Upon visible-light activation, such composite enables photocatalyse H2 evolution with a rate of 181 μmol h −1 g −1 around the 4.2 times that of pure g-C3 N4 as a reference. Such composite catalyst exhibits excellent recycling and reusable behaviors. The formation of BBN/CN heterojunction and the existence of oxygen vacancies are the main reasons for the distinctly improvement of its photocatalytic activity, which has been verified by theoretical calculations. Highlights: A novel composite BBN and g-C3 N4 . A new type of heterostructure with oxygen-rich vacancies. Exhibits excellent photocatalytic performance in H2 evolution.