title: Photochemical fabrication of 3D hierarchical Mn3O4/H-TiO2 composite films with excellent electrochemical capacitance performance.
abstract: We herein report a novel, energy-saving and environmentally benign photodeposition approach to fabricate a manganese oxide film on hydrogenated TiO2 (H-TiO2) nanotube arrays using a Mn(2+)-containing solution as a precursor. Mn(2+) ions are oxidized to Mn3O4 by the photogenerated holes during the photodeposition. The preferential growth of Mn3O4 on the nucleation sites leads to the formation of Mn3O4 nanorods on each H-TiO2 nanotube, forming a 3D hierarchical Mn3O4/H-TiO2 composite film. The as-fabricated 3D hierarchical Mn3O4/H-TiO2 composite film electrode delivers a high specific capacitance of 508 F g(-1) at a current of 0.7 A g(-1). The composite film electrode still shows a specific capacitance of 228 F g(-1) even at a high rate of 35.7 A g(-1), demonstrating its prominent rate capability. Remarkably, the composite film electrode shows no obvious capacitance decay after 10,000 charge/discharge cycles at a current density of 3.6 A g(-1), revealing its superior electrochemical cycling stability. The prominent pseudocapacitive performance of the composite film electrode can be attributed to its unique structure characteristics. The as-constructed energy-saving and environmentally benign photodeposition method can be used as a general and efficient route to prepare other composite materials with controlled morphologies and dimensions.
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China. wjm@zju.edu.cn.
authors.forename: Shasha
authors.initials: S
authors.lastname: Zhu
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China. wjm@zju.edu.cn.
authors.forename: Peipei
authors.initials: P
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China. wjm@zju.edu.cn.
authors.forename: Ling
authors.initials: L
authors.lastname: Chang
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China. wjm@zju.edu.cn.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Zhong
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China. wjm@zju.edu.cn.
authors.forename: Kai
authors.initials: K
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China. wjm@zju.edu.cn.
authors.forename: Haibo
authors.initials: H
authors.lastname: Shao
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China. wjm@zju.edu.cn.
authors.forename: Jianming
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China. wjm@zju.edu.cn.
authors.forename: Jianqing
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China. wjm@zju.edu.cn.
authors.forename: Chu-nan
authors.initials: CN
authors.lastname: Cao