Synthesis of novel CoOx decorated CeO2 hollow structures with an enhanced photocatalytic water oxidation performance under visible light irradiation

被引：30
作者：
Fang, Siman [1 ,2 ]
Li, Songsong [2 ]
Ge, Lei [1 ,2 ]
Han, Changcun [2 ]
Qiu, Ping [2 ]
Gao, Yangqin [2 ]
机构：
[1] China Univ Petr, Coll Sci, State Key Lab Heavy Oil Proc, 18 Fuxue Rd, Beijing 102249, Peoples R China
[2] China Univ Petr, Coll Sci, Dept Mat Sci & Engn, 18 Fuxue Rd, Beijing 102249, Peoples R China
来源：
DALTON TRANSACTIONS | 2017年 / 46卷 / 32期
基金：
美国国家科学基金会;
关键词：
TRANSIENT PHOTOVOLTAGE; AG NANOPARTICLES; H-2; EVOLUTION; SOLAR-CELLS; OXYGEN; CATALYSTS; COCATALYST; XPS; SPECTROSCOPY; NANORODS;
D O I：
10.1039/c6dt04682g
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Cobalt oxide decorated octahedral ceria hollow structures (CoOx/CeO2) with various contents of CoOx nanoparticles were prepared via a simple chemical impregnation method. The obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse-reflectance spectroscopy (DRS), surface photovoltage spectroscopy (SPV) and transient photovoltage spectroscopy (TPV). The photocatalytic oxygen evolution via water oxidation was investigated for the as-prepared CoOx/CeO2 nanocage composites. The photocatalytic results indicate that the CoOx/CeO2 nanocage composite with 1 mol% CoOx shows the highest photocatalytic activity. The excellent photocatalytic activity can be attributed to the improved visible-light absorption of CoOx/CeO2 composites and the efficient separation of excited electron-hole pairs between CoOx and CeO2, which can effectively enhance the lifetime of charge carriers in the CoOx-modified samples and then improve the oxygen evolution activity. Cobalt oxide is expected to be an excellent water oxidation co-catalyst for semiconductor photocatalysts.
引用
收藏
页码：10578 / 10585
页数：8
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