Electrochemical storage of hydrogen in nanotubular TiO2 arrays

被引:61
|
作者
Pillai, P. [1 ]
Raja, K. S. [1 ]
Misra, M. [1 ]
机构
[1] Univ Nevada, Reno, NV 89557 USA
关键词
nanotubular TiO2; hydrogen storage; cyclic voltammetry; charge density;
D O I
10.1016/j.jpowsour.2006.03.088
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Vertically oriented nanotubular TiO2 arrays were formed by a simple anodization process. Hydrogen storage studies were carried out on the TiO2 nanotubular arrays having different diameters by charging and discharging hydrogen with potentiostatic/galvanostatic control. The hydrogen storage capacities of the nanotubes were only marginally affected by the tube diameter. Concentration of oxygen vacancies as defects influenced the hydrogen storage of the nanotubes. Annealing of the TiO2 nanotubes in argon atmosphere increased the defect density and decreased the hydrogen discharge during initial charge-discharge cycles. Hydrogen storage studies through electrochemical route did not show significant storage capacity of TiO2 nanotubes. Diffusion of hydrogen as protons and interference of the double layer capacitance of nanotubes could be attributed to the lower hydrogen storage capacity. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:524 / 530
页数:7
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