光催化
材料科学
X射线光电子能谱
扫描电子显微镜
光谱学
分解水
傅里叶变换红外光谱
煅烧
漫反射红外傅里叶变换
光致发光
可见光谱
透射电子显微镜
石墨氮化碳
电子顺磁共振
工程物理
分析化学(期刊)
化学工程
光化学
物理
催化作用
工程类
化学
生物化学
作者
Hanyi Xie,Zhao Yanfang,Li Huijuan,Yizhen Xu,Xiangfeng Chen
标识
DOI:10.1007/s10853-019-03664-9
摘要
A 2D Z-scheme BiVO4/g-C3N4 photocatalyst was successfully synthesized by a two-step hydrothermal/calcination method for overall water splitting. Morphology design to restrain the growth of BiVO4 nanoplates with thickness around 20 nm was achieved by adjusting the pH value and introducing graphene sheets. Then, the BiVO4/g-C3N4 (BVO-CN) hybrid photocatalysts were fabricated with different mass ratios of two components. The structures and optical properties of the BVO-CN photocatalysts were characterized by transmission electron microscope, scanning electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, ultraviolet–visible spectroscopy, and photoluminescence spectroscopy. In application, the BVO-CN photocatalysts exhibited the catalytic overall water splitting activity up to 15.6 μmol h−1 for H2 production and 7.3 μmol h−1 for O2 evolution under visible light irradiation. A possible Z-scheme mechanism is proposed for the enhanced photocatalytic activity and was further confirmed by electron spin resonance spectroscopy. This study demonstrated enhanced overall water splitting photocatalytic performance of BiVO4/g-C3N4 photocatalyst by constructing a 2D nanoplates morphology and shed light on the morphology design of Z-scheme semiconductor materials.
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