期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 241, 期 -, 页码 452-460出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2018.08.073
关键词
Defect-Engineering; Monolayer g-C3N4; MnO2; Defective Mn3+ active sites; Overall water splitting
资金
- National Nature Science Foundation of China [21476097, 21776118]
- China Postdoctoral Science Foundation [2017M620193]
- Natural Science Foundation of Jiangsu Province [BK20161363]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- high performance computing platform of Jiangsu University
Defect-Engineering is a promising way to introduce metal cation vacancies into target materials, thereby resulting in excellent performance for photocatalytic or electrocatalytic water splitting. Inspired by this, we propose an efficient Z-scheme system comprised of 2D MnO2/Monolayer g-C3N4 with defective Mn3+ active sites to realize overall water splitting. These defective Mn3+ active sites might boost H2O adsorption and optimize the interfacial charge separation/transfer in the photocatalytic process by introducing the Mn3+/Mn4+ redox couple. As a result, the composite displays an excellent and stable H-2 and O-2 evolution rates of 60.6 and 28.9 mu mol g(-1) h(-1), respectively. Meanwhile, the H-2 evolution rate is up to 28.0 mmol g(-1) h(-1) with apparent quantum efficiency of 23.33% at 420 nm in the H-2 evolution half reaction. This study provides a new opportunity for constructing a Z-scheme overall water splitting system by exploiting the redox reactions of other metal cation vacancies.
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