Effect of oxygen deficiency on vis-light photocatalytic activity in AZO

Micro & nano letters

article

Xiaohui Sun¹  Hong Du¹ 

[1] Center of Electrochemical Technology and Application Engineering Research, College of Chemistry and Chemical Engineering, Xinjiang Normal University

关键词: X-ray diffraction;    X-ray photoelectron spectra;    aluminium;    visible spectra;    semiconductor growth;    transmission electron microscopy;    wide band gap semiconductors;    zinc compounds;    paramagnetic resonance;    scanning electron microscopy;    vacancies (crystal);    ultraviolet spectra;    II-VI semiconductors;    crystal structure;    semiconductor doping;    photocatalysis;    energy gap;    photocatalysts;    crystal growth from solution;    oxygen deficiency;    vis-light photocatalytic activity;    surface oxygen vacancies;    one-step hydrothermal method;    chemical composition;    morphology;    X-ray diffraction;    transmission electron microscopy;    electron paramagnetic resonance spectra;    vis-light absorption;    zinc oxide surface;    ultraviolet–visible diffuse reflectance spectra;    aluminum doped zinc oxide photocatalyst;    crystal structure;    X-ray photoelectron spectroscopy;    optical property;    high-resolution TEM;    narrow band gap;    AZO sample;    cycling stability;    photocatalytic activity;    ZnOAl;   

DOI  :  10.1049/mnl.2019.0166

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Aluminium (Al)-doped zinc oxide (ZnO) photocatalyst with surface oxygen vacancies was synthesised by one-step hydrothermal method. The oxygen vacancies drawn into ZnO surface by Al doping can effectively enhance visible (vis)-light photocatalytic activity. The crystal structure, chemical composition and morphology of Al-doped ZnO (AZO) photocatalysts were characterised by X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy (TEM). The optical property was characterised by ultraviolet–vis diffuse reflectance spectra. High-resolution TEM and electron paramagnetic resonance spectra mainly confirm the existence of oxygen vacancies on the ZnO surface. Oxygen vacancies result in a narrowing of the bandgap ( E g = 2.92 eV) and an increase in the vis-light absorption of the sample. AZO sample exhibits good cycling stability, and no obvious decrease in the photocatalytic activity was observed even after four cycles.

【 授权许可】

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