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Bio-inspired high-performance solid-state supercapacitors with electrolyte, separator, binder and electrodes entirely from kelp

Abstract

This is the first report on a type of solid-state supercapacitors with all the key components, including electrolyte, separator, binder and electrodes, coming entirely from a single precursor: kelp, an abundant and economic food resource in the ocean. The alginate hydrogel electrolyte, alginate membrane separator and alginate binder developed for constructing supercapacitor are all from the extract of kelp, i.e. sodium alginate, which is an ionic conductive and high-modulus natural polysaccharide, and is food and skin safe. The activated carbon electrode material produced directly from the kelp presents 3D hierarchical porous architecture, owning a high specific surface area of 4425 m2 g-1 and a high pore volume up to 3.22 cm3 g-1. Such a novel cell construction provides the solid-state supercapacitor with high ionic conductivity and low interface resistances, thus excellent electrochemical performance, including a high specific capacitance of the electrode (277 F g-1 or 88.2 F cm-3), fast rate capability (156 F g-1 retained at 20 A g-1) and good stability both in cycling test and in constant voltage hold test. The electrochemical performance of the “all-kelp” supercapacitor is the best among all the carbon-based solid-state supercapacitors reported in literatures. Moreover, the “all-kelp” supercapacitor is environment-friendly and biocompatible, particularly suitable for the advanced implantable medical devices and wearable electronics, in which the safety and reliability are especially important.

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Publication details

The article was received on 14 Sep 2017, accepted on 13 Nov 2017 and first published on 14 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08095F
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Bio-inspired high-performance solid-state supercapacitors with electrolyte, separator, binder and electrodes entirely from kelp

    L. Wei, J. Zeng and X. Guo, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08095F

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