2022

Electrochemistry Communications

Rocznik: 2022 | Tom: vol. 138

artykuł naukowy

angielski

EN This paper reports on the preparation, characterization, and electrochemical performance of the novel, nonaqueous biopolymer-based gel electrolytes with an ionic liquid for high-voltage electrochemical capacitors. The quasi solid-state electrolytes contain a biopolymer matrix, made of cellulose or chitin, and ionic liquid (IL), 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF4), which acts as a plasticizer and an ionic conductor. The gel biopolymer electrolytes were prepared by a novel, but simple method. It was based on the casting so- lution technique with an intermediate step of hydrogel production, followed by the exchanging of aqueous phase by IL plasticizer. Contrary to well-known hydrogel electrolytes, the biopolymer-based gels with IL could safely operate to high voltages, up to 3.0 V according to our experiments. The wide electrochemical stability allowed to extend the maximum energy density of gel electrolyte-based supercapacitors. Moreover, the investigated systems displayed a high performance in terms of specific capacitance, energy-power densities, and cyclability. There are compared to the reference cell with liquid electrolyte in terms of electrochemical characteristic, showing the specific capacitance values up to 140–145 F g−1, with excellent capacitance retention (ca. 90 %) after 10,000 galvanostatic charge and discharge cycles. Taking into account all the above-mentioned features, the prepared gel biopolymer electrolytes appear to be promising eco-friendly materials for high-performance supercapacitors.

22.04.2022

107282-1 - 107282-7

10.1016/j.elecom.2022.107282

https://www.sciencedirect.com/science/article/pii/S1388248122000844?via%3Dihub

Article number: 107282

CC BY (uznanie autorstwa)

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22.04.2022

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