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Investigation of protic ionic liquid electrolytes for porous RuO2 micro-supercapacitors

Abstract : The rapid advancement of the Internet of things (IoT) with applications across various sectors urges the development of miniaturized energy-storage devices that can harvest or deliver energy with high power capabilities. While micro-supercapacitors can meet the high-power requirements of ubiquitous sensors connected to IoT networks, their low voltage and low energy density remain a major bottleneck preventing their wide-scale adoption. In this report, we develop micro-supercapacitors using RuO2 electrodes providing pseudocapacitive charge storage in protic ionic liquid-based non-aqueous electrolytes while enlarging their operational voltage. The triethylammonium bis(trifluoromethanesulfonyl)imide (TEAH-TFSI)-based interdigitated porous RuO2 micro-supercapacitors showed an extended cell voltage up to 2 V with 4 times more energy density compared with conventional H2SO4 electrolyte. We then developed an all-solid-state micro-supercapacitor using TEAH-TFSI-based ionogel electrolyte able to deliver high areal capacitance (78 mF cm-2 at 2 mV s-1) and long-term cycling stability that is superior to state-of-the-art ionogel-based micro-supercapacitors employing carbonbased or pseudocapacitive materials. This study gives a new perspective to develop all-solidstate micro-supercapacitors using pseudocapacitive active materials that can operate in ionicliquid-based non-aqueous electrolytes compatible with on-chip IoT-based device applications seeking high areal energy/ power performance.
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https://hal.laas.fr/hal-03773385
Contributor : Sarinn David PECH Connect in order to contact the contributor
Submitted on : Friday, September 9, 2022 - 10:46:25 AM
Last modification on : Tuesday, October 25, 2022 - 11:58:11 AM

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Jensheer Shamsudeen Seenath, David Pech, Dominic Rochefort. Investigation of protic ionic liquid electrolytes for porous RuO2 micro-supercapacitors. Journal of Power Sources, 2022, 548 (232040), ⟨10.1016/j.jpowsour.2022.232040⟩. ⟨hal-03773385⟩

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