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

Inamdar, Akbar I., Kim, Jongmin, Jo, Yongcheol, Woo, Hyeonseok, Cho, Sangeun, Pawar, Sambhaji M., Lee, Seongwoo, Gunjakar, Jayavant L., Cho, Yuljae, Hou, Bo, Cha, SeungNam, Kwak, Jungwon, Park, Youngsin, Kim, Hyungsang and Im, Hyunsik 2017. Highly efficient electro-optically tunable smart-supercapacitors using an oxygen-excess nanograin tungsten oxide thin film. Solar Energy Materials and Solar Cells 166 , pp. 78-85. 10.1016/j.solmat.2017.03.006

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Abstract

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 (~170 cm2/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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Elsevier
ISSN: 0927-0248
Date of Acceptance: 7 March 2017
Last Modified: 20 Feb 2020 12:43
URI: http://orca.cf.ac.uk/id/eprint/129505

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