TiN0.3/CeO2光阳极材料的构筑及其光电催化性能

doi:10.1016/S1872-2067(14)60295-3

催化学报 ›› 2015, Vol. 36 ›› Issue (4): 550-554.DOI: 10.1016/S1872-2067(14)60295-3

TiN_0.3/CeO₂光阳极材料的构筑及其光电催化性能

崔华楠^a, 李登^a, 刘冠涛^a, 梁振兴^b, 石建英^a

a 中山大学化学与化学工程学院, 广东广州 510275;
b 华南理工大学化学与化工学院, 广东广州 510640

收稿日期:2014-11-07 修回日期:2015-01-12 出版日期:2015-03-23 发布日期:2015-03-23
通讯作者: Jianying Shi
基金资助:
国家自然科学基金(21103235); 广东省自然科学基金(S2012010010775); 广州市科技计划(2013J4100110).

A TiN_0.3/CeO₂ photo-anode and its photo-electrocatalytic performance

Huanan Cui^a, Deng Li^a, Guantao Liu^a, Zhenxing Liang^b, Jianying Shi^a

a School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, Guangdong, China;
b School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China

Received:2014-11-07 Revised:2015-01-12 Online:2015-03-23 Published:2015-03-23
Supported by:
This work was supported by the National Natural Science Foundation of China (21103235), the Natural Science Foundation of Guangdong Province (S2012010010775), and the Science and Technology Program of Guangzhou (2013J4100110).

摘要/Abstract

摘要：

采用高温氮化法在Ti片基底上生长一层TiN_0.3薄膜, 进一步利用电化学沉积法在TiN_0.3薄膜上生长CeO₂, 制备了TiN_0.3/CeO₂复合材料. 分别用X射线衍射和扫描电镜研究了复合材料的晶体和形貌结构, 用紫外-可见光谱探究了材料的光学吸收性能. 结果表明, 球状CeO₂颗粒均匀地分布在TiN_0.3表面; 该复合光阳极除了TiN_0.3对可见光的吸收外, 外层的CeO₂同时实现了对紫外光的吸收. 光电催化性能研究发现, TiN_0.3/CeO₂复合光阳极能够显著提高TiN_0.3或CeO₂的光电流密度, 同时增加光电流的稳定性. TiN_0.3/CeO₂独特的双层结构是其光电催化性能提高的主要原因. 在TiN_0.3与CeO₂界面处异质结构的驱动下, CeO₂层中的光生电子迁移至TiN_0.3层, 而相应的光生空穴在界面处被Ce³⁺所消耗, 从而提高了CeO₂层中电子和空穴的分离效率, 光电流密度也随之提高; 同时, 位于CeO₂与电解液界面处的Ce³⁺作为水分子的吸附中心和反应活性中心, 加快了界面处水的氧化反应, 从而进一步促进了稳定光电流的产生. 鉴于TiN_0.3/CeO₂光阳极材料优良的光电催化性能, 其在太阳能光电催化领域具有潜在的应用, 对于新型高效光电转化材料的设计与合成具有借鉴作用.

关键词: 氮化钛, 氧化铈, TiN_0.3/CeO₂, 光阳极, 光电催化

Abstract:

A TiN_0.3/CeO₂ photo-anode was synthesized by the electro-deposition of CeO₂ on TiN_0.3 supported on a Ti substrate. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to study its structure and morphology. The crystalline nature of TiN_0.3 and CeO₂ was confirmed by XRD, and SEM images showed that CeO₂ spheres uniformly distributed on the TiN_0.3 surface. In addition to visible light absorption by TiN_0.3, UV light was also harvested by the outer CeO₂ component on the TiN_0.3/CeO₂ combined photo-anode. In the photo-electrochemical measurement, TiN_0.3/CeO₂ showed four times higher photo-current density than TiN_0.3 or CeO₂, and the photo-current stabilization was also significantly improved compared to TiN_0.3 or CeO₂. The specific double-layer structure of TiN_0.3/CeO₂ contributed to its improved photo-electrocatalytic performance. Electron transfer from CeO₂ to TiN_0.3 driven by the hetero-junction and hole consumption by Ce³⁺ at the TiN_0.3/CeO₂ interface promoted the separation of electron and hole in the CeO₂ layer, which improved the photo-current generation. Ce³⁺ that existed in CeO₂ acted as the adsorption and activation site for H₂O and accelerated the oxidation of H₂O on the CeO₂ surface, which further led to the high and stable photo-current density generated in TiN_0.3/CeO₂. This finding is useful for the design and synthesis of an effective photo-electrocatalysis material for solar energy conversion.

Key words: Titanium nirtide, Ceria, TiN_0.3/CeO₂, Photo-anode, Photo-electrocatalysis

崔华楠, 李登, 刘冠涛, 梁振兴, 石建英. TiN_0.3/CeO₂光阳极材料的构筑及其光电催化性能[J]. 催化学报, 2015, 36(4): 550-554.

Huanan Cui, Deng Li, Guantao Liu, Zhenxing Liang, Jianying Shi. A TiN_0.3/CeO₂ photo-anode and its photo-electrocatalytic performance[J]. Chinese Journal of Catalysis, 2015, 36(4): 550-554.

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TiN_0.3/CeO₂光阳极材料的构筑及其光电催化性能

A TiN_0.3/CeO₂ photo-anode and its photo-electrocatalytic performance

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