Photoassisted charge behavior of hydrogen storage alloy-TiO2/Pt electrodes.
The photoassisted charge behavior of hydrogen storage alloy modified with TiO2/Pt nanocomposites (HSA-TiO2/Pt electrode) was investigated. The HSA-TiO2/Pt electrode can be photocharged under current. The mechanism of photoassisted behavior of the HSA-TiO2/Pt electrode was explained through the results of cyclic voltammogram and impedance measurements of the HSA-TiO2/Pt electrode. Upon illumination, the photogenerated electrons can charge the electrode, but the photogenerated holes may oxidize the hydrogen storage alloy to form a layer of metal oxide. Because the current could keep the electrode active, the H atoms produced by photogenerated electrons diffused to the hydrogen storage alloy and a metal hydride formed. The electrode delivered a higher discharge capacity due to the assistance of photocharge.
Wang
G T
GT
Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
Tu
J P
JP
Zhang
W K
WK
Wang
X L
XL
Huang
H
H
Gan
X P
XP