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 ORCID: https://orcid.org/0000-0001-9918-8223, 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 First Compliant Deposit:	5 February 2020
Date of Acceptance:	7 March 2017
Last Modified:	19 Nov 2024 11:45
URI:	https://orca.cardiff.ac.uk/id/eprint/129338

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