光催化
光电流
异质结
材料科学
量子点
载流子
电子转移
降级(电信)
光化学
可见光谱
电催化剂
光电子学
化学工程
纳米技术
电极
催化作用
化学
电化学
计算机科学
电信
生物化学
工程类
物理化学
作者
Lingwei Li,Hange Feng,Xiaofan Wei,Kun Jiang,Shaolin Xue,Paul K. Chu
出处
期刊:Nanomaterials
[Multidisciplinary Digital Publishing Institute]
日期:2020-01-31
卷期号:10 (2): 253-253
被引量:27
摘要
A recyclable photoelectrode with high degradation capability for organic pollutants is crucial for environmental protection and, in this work, a novel CeO2 quantum dot (QDs)/Ag2Se Z-scheme photoelectrode boasting increased visible light absorption and fast separation and transfer of photo-induced carriers is prepared and demonstrated. A higher voltage increases the photocurrent and 95.8% of tetracycline (TC) is degraded by 10% CeO2 QDs/Ag2Se in 75 minutes. The degradation rate is superior to that achieved by photocatalysis (92.3% of TC in 90 min) or electrocatalysis (27.7% of TC in 90 min). Oxygen vacancies on the CeO2 QDs advance the separation and transfer of photogenerated carriers at the interfacial region. Free radical capture tests demonstrate that •O2−, •OH, and h+ are the principal active substances and, by also considering the bandgaps of CeO2 QDs and Ag2Se, the photocatalytic mechanism of CeO2 QDs/Ag2Se abides by the Z-scheme rather than the traditional heterojunction scheme. A small amount of metallic Ag formed in the photocatalysis process can form a high-speed charge transfer nano channel, which can greatly inhibit the photogenerated carrier recombination, improve the photocatalytic performance, and help form a steady Z-scheme photocatalysis system. This study would lay a foundation for the design of a Z-scheme solar photocatalytic system.
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