Enhanced capacitive performance of TiO2 nanotubes with molybdenum oxide coating

•MoO3 was firstly deposited on TiO2 nanotubes for better supercapacitive behaviors.•Coated TiO2 nanotubes showed much higher capacitance than pure TiO2 or MoO3 films.•Deposition cycles were optimized to gain the best capacitance of MoO3/TiO2 hybrids. Alpha-phase MoO3 is electrochemically deposited o...

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Bibliographic Details
Published in:Applied surface science 2014-05, Vol.300, p.165-170
Main Authors: Guan, Dongsheng, Gao, Xianfeng, Li, Jianyang, Yuan, Chris
Format: Article
Language:English
Subjects:
Anodic oxidation
Anodizing
Arrays
Capacitance
Coating
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Deposition
Electrodeposition
Electrodes
Exact sciences and technology
MoO3
Nanostructure
Nanotubes
Physics
Supercapacitor
TiO2 nanotube
Titanium dioxide
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Summary:•MoO3 was firstly deposited on TiO2 nanotubes for better supercapacitive behaviors.•Coated TiO2 nanotubes showed much higher capacitance than pure TiO2 or MoO3 films.•Deposition cycles were optimized to gain the best capacitance of MoO3/TiO2 hybrids. Alpha-phase MoO3 is electrochemically deposited on well-aligned TiO2 nanotubes which are synthesized by anodic oxidation. The morphology, composition and electrochemical behaviors of MoO3-coated and bare TiO2 nanotubes are studied. The former deliver greatly higher capacitance than the latter and their performance can be readily optimized by varying MoO3 deposition cycles. The large areal capacitance of 209.6mFcm−2 at a scan rate of 5mVs−1 is firstly achieved for TiO2 nanotube array electrode. In addition, the coated TiO2 nanotubes show significantly more capacitance than a dense MoO3 film. For example, they exhibit a capacitance up to 74.9Fg−1 at 5mVs−1 in 1M KCl solution, while the dense film only shows a capacitance of 32.3Fg−1 under same conditions. Such improvement is found ascribed to MoO3 with high pseudocapacity and TiO2 nanotubes with large surface area allowing efficient MoO3 nanoparticle loading and rapid charge transfer. This nanostructured electrode with features of facile synthesis and excellent performance is believed as a potential candidate for supercapacitor applications.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2014.02.029