Electrical and electrochemical characterization of poly (ethylene oxide)/V2O5 xerogel electrochromic films
Electrical and electrochemical characterization of poly (ethylene oxide)/V2O5 xerogel electrochromic films
复制标题
DOI：
10.1016/j.ssi.2008.01.019
复制
发表时间：
2008-09-15
影响因子：
3.2
通讯作者：
Zakharova, Galina S.
中科院分区：
文献类型：
--
作者：
Jin, Aiping;Chen, Wen;Zakharova, Galina S.
采用溶胶-凝胶直接插层法制备了聚环氧乙烷（PEO）插层的五氧化二钒干凝胶膜。采用XRD、HRTEM、FTIR等分析手段对其结构性能进行了表征。利用循环伏安图和莫特-肖特基图详细研究了电致变色过程及其与平带电位的关系。对加热和冷却过程中沿V-O层和跨V-O层的电学性能进行了评价。结果表明，适量PEO的加入可以提高V2O5中心点nH(2)O薄膜的电导率，降低其水蒸气吸收率，从而改善其电化学性能。此外，Mott-Schottky图验证了电致变色过程，该过程可以用锂离子和电子的双重插入和萃取机制来描述。电化学阻抗谱验证了PEO/V2O5电致变色膜有利于V4+/V5+固态氧化还原转变动力学。(c) 2008 Elsevier B.V.版权所有
Vanadium pentoxide xerogel films intercalated by poly (ethylene oxide), PEO, were prepared by direct intercalation method via a sol-gel route. The structural properties were investigated using XRD, HRTEM and FTIR analysis. The detailed studies of electrochromic process and their correlation with flatband potentials have been carried out by cyclic voltammograms and Mott-Schottky plots. The electrical properties along and across V-O layers at the heating and cooling process have been evaluated. These results revealed that the insertion of proper amount of PEO can improve the electrochemical properties of V2O5 center dot nH(2)O films by increasing the electrical conductivity and decreasing the water vapor absorption. Moreover, Mott-Schottky plots verified the electrochromic process, which can be described using the double insertion and extraction mechanism of lithium ions and electrons. The electrochemical impedance spectra verified that PEO/V2O5 electrochromic films favored the kinetics of V4+/V5+ solid-state redox transitions. (c) 2008 Elsevier B.V. All rights reserved.