Highly efficient electro-optically tunable smart-supercapacitors using an oxygen-excess nanograin tungsten oxide thin film

被引：108

作者：

Inamdar, Akbar I. ^{[1
]}

Kim, Jongmin ^{[1
]}

Jo, Yongcheol ^{[1
]}

Woo, Hyeonseok ^{[1
]}

Cho, Sangeun ^{[1
]}

Pawar, Sambhaji M.

Lee, Seongwoo ^{[1
]}

Gunjakar, Jayavant L. ^{[1
]}

Cho, Yuljae ^{[2
]}

Hou, Bo ^{[2
]}

Cha, SeungNam ^{[2
]}

Kwak, Jungwon ^{[3
]}

Park, Youngsin ^{[4
]}

Kim, Hyungsang ^{[1
]}

Im, Hyunsik ^{[1
]}

机构：

[1] Dongguk Univ, Div Phys & Semicond Sci, Seoul 04620, South Korea

[2] Univ Oxford, Dept Engn Sci, Parks Rd, Oxford OX1 3PJ, England

[3] Asan Med Ctr, Med Phys Dept, Seoul, South Korea

[4] Ulsan Natl Inst Sci & Technol, Sch Nat Sci, Ulsan 44919, South Korea

来源：

SOLAR ENERGY MATERIALS AND SOLAR CELLS | 2017年 / 166卷

基金：

新加坡国家研究基金会;

关键词：

Multi-functional electrode; Oxygen-excess tungsten oxide; Nanograin; Electrochromism; Supercapacitor; ELECTROCHROMIC PROPERTIES; NICKEL-OXIDE; SPRAY-PYROLYSIS; ENERGY-STORAGE; WO3; TEMPERATURE; PERFORMANCE; ARRAYS; COLORATION; ELECTRODES;

D O I：

10.1016/j.solmat.2017.03.006

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：

A smart supercapacitor shares the same electrochemical processes as a conventional energy storage device while also having electrochromic functionality. The smart supercapacitor device can sense the energy storage level, which it displays in a visually discernible manner, providing increased convenience in everyday applications. Here, we report an electro-optically tunable smart supercapacitor based on an oxygen-rich nanograin WO3 electrode. The nanostructured WO3 electrode is dark blue in color in the charged state and becomes transparent in its discharged state with a high optical modulation of 82%. The supercapacitor has a specific capacitance of 228 F g(-1) at 0.25 Ag-1 with a large potential window (1.4 V). It is highly durable, exhibits good electrochemical stability over 2000 cycles, retains 75% of its initial capacitance, and exhibits high coloration efficiency (similar to 170 cm(2)/C). The excellent electrochromic and electrochemical supercapacitor properties of the electrode is due to the synergetic effect between nanograin morphology and excess oxygen. A smart-supercapacitor fabricated with an oxygen-rich nanograin WO3 electrode exhibits a superb combination of energy storage and highly-efficient electrochromic features in one device that can monitor the energy storage level through visible changes in color.

引用

页码：78 / 85

页数：8

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