Growth of vertically aligned hierarchical WO3 nano-architecture arrays on transparent conducting substrates with outstanding electrochromic performance

被引:129
作者
Cai, G. F. [1 ,2 ]
Tu, J. P. [1 ,2 ,3 ]
Zhou, D. [1 ,2 ]
Wang, X. L. [1 ,2 ,3 ]
Gu, C. D. [1 ,2 ,3 ]
机构
[1] Zhejiang Univ, State Key Lab Silicon Mat, Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, Hangzhou 310027, Zhejiang, Peoples R China
[2] Zhejiang Univ, Dept Mat Sci & Engn, Hangzhou 310027, Zhejiang, Peoples R China
[3] Zhejiang Univ, Cyrus Tang Ctr Sensor Mat & Applicat, Hangzhou 310027, Zhejiang, Peoples R China
关键词
Tungsten trioxide; Nano-architecture array; Electrochromism; Electrochemical property; Solvothermal method; Infrared region; TUNGSTEN-OXIDE FILMS; NANOSTRUCTURED MATERIALS; EFFICIENT ROUTE; HYBRID FILM; THIN-FILMS;
D O I
10.1016/j.solmat.2014.01.042
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Vertically aligned hierarchical WO3 nano-architectures on transparent conducting substrate (3 x 2.5 cm(2) in size and sheet resistance R-s=10 Omega) are produced via a template-free solvothermal method. The nanostructured array films with thicknesses of about 1.1 mu m show remarkable enhancement of the electrochromic properties in visible spectrum and infrared region. In particular, a significant optical modulation (66.5% and 66.0% at 633 nm, 73.8% and 53.9% at 2000 nm, 57.7% and 51.7% at 8 mu m), fast switching speed (4.6 s/3.6 s and 2.0 s/3.4 s), high coloration efficiency (126 and 120 cm(2) C-1 at 633 nm) and excellent cycling stability (maintained 77.5% and 81.7% of the initial optical modulation after 4500-cycles) are achieved for the nanotree and nanowire arrays, respectively. The improved electrochromic properties are mainly attributed to the vertically aligned structure and the porous space among the nanotrees or nanowires, which make the diffusion of H+ in these arrays easier and also supply larger surface area for charge-transfer reactions. (c) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:103 / 110
页数:8
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