Citation: JIN Tao, XU Di, DIAO Peng, XIANG Min. Preparation and Photoelectrocatalytic Water Oxidation Properties of FeO(OH)-TiO₂/CoPi Composite Photoanodes[J]. Acta Physico-Chimica Sinica, ;2012, 28(10): 2276-2284. doi: 10.3866/PKU.WHXB201209101 shu

Preparation and Photoelectrocatalytic Water Oxidation Properties of FeO(OH)-TiO₂/CoPi Composite Photoanodes

1.
Key Laboratory of Aerospace Science and Engineering, Department of Materials Science and Engineering School, Beihang University, Beijing 100191, P. R. China

Received Date: 4 July 2012
Available Online: 10 September 2012
Fund Project: 国家自然科学基金(20973020, 21173016) (20973020, 21173016) 高等学校博士学科点基金(20101102110002) (20101102110002) 新世纪人才支持计划(NCET-08-0034)资助项目 (NCET-08-0034)

TiO₂ nanocrystals were synthesized using a sol-gel method, and then the impregnation technique was used to modify the surface of the TiO₂ nanocrystals with FeO(OH). The optimal concentration of Fe³⁺ for the modification of the TiO₂ nanocrystals was determined by UV-Vis spectroscopy. A cobalt-phosphate (CoPi) water oxidation catalyst was electrochemically deposited onto the FeO(OH)- TiO₂ photoanodes. The resulting FeO(OH)-TiO₂/CoPi composite photoanodes were systematically characterized by transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), and scanning electron microscopy (SEM), and the photoelectrochemical water oxidation properties of the FeO(OH)-TiO₂/CoPi composite photoanodes were investigated in neutral conditions by electrochemical and photoelectrochemical methods. The results indicated that the TiO₂ particles were pure anatase nanocrystals, and the FeO(OH) phase on the TiO₂ surfaces was ethite. The optimal light absorption properties of the FeO(OH)-TiO₂ photoanodes were achieved when the photoanodes were prepared in the precursor solution with a Fe³⁺:TiO₂ mass ratio of 0.05%. The overpotential for oxygen evolution on the FeO(OH)-TiO₂/CoPi composite photoanodes under illumination decreased significantly compared with that obtained on the CoPi catalyst. The high oxygen evolution activity of the composite photoanodes can be attributed to modification of FeO(OH) on TiO₂ nanocrystal surfaces changing the light absorption band from the ultraviolet to the visible region and CoPi inhibited hole-electron recombination through facilitating the photon-induced hole transfer for water oxidation.
- Hydrogen ferric oxide,
- TiO₂ nanocrystal,
- Cobalt-phosphate catalyst,
- Photoelectrochemical oxygen evolution,
- Photon-induced holes
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Preparation and Photoelectrocatalytic Water Oxidation Properties of FeO(OH)-TiO2/CoPi Composite Photoanodes

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通讯作者: 陈斌, bchen63@163.com

Preparation and Photoelectrocatalytic Water Oxidation Properties of FeO(OH)-TiO₂/CoPi Composite Photoanodes