Heterostructured CoO/3D-TiO₂ nanorod arrays for photoelectrochemical water splitting hydrogen production

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• 作者：Jie Yan ; Siyuan Yang ; Zhikun Xie ; Xin Li…
• 关键词：CoO nanoparticles ; Three ; dimensional TiO2 nanorod arrays ; p ; n heterojunction ; Photoelectrochemical ; Water splitting
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：21
• 期：2
• 页码：455-461
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Physical Chemistry; Electrochemistry; Energy Storage; Characterization and Evaluation of Materials; Analytical Chemistry; Condensed Matter Physics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1433-0768
• 卷排序：21

文摘

Homogeneous p-type cobalt (II) oxide (CoO) nanoparticles were successfully deposited on n-type three-dimensional branched TiO₂ nanorod arrays (3D-TiO₂) through photochemical deposition and thermal decomposition to form a novel CoO/3D-TiO₂ p-n heterojunction nanocomposite. Due to the narrow band gap of CoO nanoparticles (~2.4 eV), the as-synthesized CoO/3D-TiO₂ exhibited an excellent visible light absorption. The amounts of deposited CoO nanoparticles obviously influence the hydrogen production rate in the photoelectrochemical (PEC) water splitting. The as-synthesized CoO/3D-TiO₂-5 obtains the highest PEC hydrogen production rate of 0.54 mL h−1 cm−2 after five-time CoO deposition cycles (at a potential of 0.0 V vs Ag/AgCl). The photocurrent density of CoO/3D-TiO₂-5 is 1.68 mA cm−1, which is ca. 2.5 times greater than that of pure 3D-TiO₂. The results showed that the formation of internal electrical-field between the CoO/3D-TiO₂ heterojunction, which has a direction from n-type TiO₂ to p-type CoO, facilitated the charge separation and transfer and resulted in a high efficiency and stable PEC activity.