纳米棒
材料科学
异质结
分解水
析氧
纳米颗粒
化学工程
光催化
纳米技术
电解质
光电化学
氧气
煅烧
光电子学
电极
电化学
化学
催化作用
物理化学
有机化学
工程类
生物化学
作者
Xuefeng Long,Feng Li,Lili Gao,Yiping Hu,Haiguo Hu,Jun Jin,Jiantai Ma
出处
期刊:Chemsuschem
[Wiley]
日期:2018-10-30
卷期号:11 (23): 4094-4101
被引量:42
标识
DOI:10.1002/cssc.201801828
摘要
Abstract Application of ZnO in the field of photoelectrochemical water splitting is limited because of its wide‐band‐gap and high recombination rate. Herein is reported the design of an efficient ZnO photoanode deposited with CoO x nanoparticles to achieve a heterojunction and oxygen vacancies. The CoO x nanoparticles with abundant oxygen vacancies were anchored onto the nanorod arrays by spin coating and calcination followed by a solvothermal treatment. CoO x nanoparticles serve the dual function of forming a p‐n heterojunction to facilitate the separation of photogenerated carriers, and act as a cocatalyst to decrease water oxidation barrier. Finally, oxygen vacancies increase the number of active redox sites and act as hole traps, enabling their migration to the electrode/electrolyte interface. The composite photoanode exhibits a high incident photon‐to‐current conversion efficiency (76.7 % at 350 nm), which is twice that of pristine ZnO, and a photoconversion efficiency of 0.68 % (0.73 V versus RHE). The current approach can be expanded to fabricate other efficient photocatalysts.
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