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Non-Polymeric Hybridization of a TEMPO Derivative with Activated Carbon for High-Energy-Density Aqueous Electrochemical Capacitor Electrodes

Abstract

Organic compounds have great potential as electrode materials with high energy and power densities, together with long cycle lifetimes. These properties can be achieved by employing redox-active organic compounds and porous carbon substrates via well-suited hybridization methods. In this study, a 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO) derivative, 4-hydroxy-TEMPO benzoate (HTB), was used as an electrode material for aqueous electrochemical capacitors due to its high redox potential characteristic to achieve high energy densities. The hybridization of HTB and activated carbon (AC) was accomplished simply by adsorbing HTB in AC via a solvent-free preparation. This procedure takes only one hour and enables achieving precise AC/HTB weight ratios, eliminating the excess use of HTB or the use of organic solvents. Of note in this method is that it is not necessary to introduce HTB molecules in polymer chains to prevent dissolution of HTB in the aqueous electrolyte with the aid of a hydrophobic group in HTB. HTB molecules are finely dispersed inside the AC pores and therefore present a huge contact area with the conductive carbon surface, allowing for fast redox reactions (i.e., high power densities) in aqueous 1 M H2SO4 despite HTB displaying poor electrical conductivity by itself. As a result, the obtained AC/HTB materials enable compatibility of high energy and power densities.

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Publication details

The article was received on 07 Nov 2017, accepted on 03 Jan 2018 and first published on 08 Jan 2018


Article type: Paper
DOI: 10.1039/C7SE00541E
Citation: Sustainable Energy Fuels, 2017, Accepted Manuscript
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    Non-Polymeric Hybridization of a TEMPO Derivative with Activated Carbon for High-Energy-Density Aqueous Electrochemical Capacitor Electrodes

    H. Itoi, H. Hasegawa, H. iwata and Y. Ohzawa, Sustainable Energy Fuels, 2017, Accepted Manuscript , DOI: 10.1039/C7SE00541E

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