Journal
ELECTROCHIMICA ACTA
Volume 282, Issue -, Pages 563-574Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.06.061
Keywords
Electron withdrawing group; Electron donating group; p-Hydroquinone; Redox additive; Supercapacitor
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Funding
- National Natural Science Foundation of China [51602003]
- Natural Science Foundation of Anhui Province [1508085QE104]
- University Scientific Research Project from Department of Education of Anhui Province [KJ2016A039]
- Startup Foundation for Doctors of Anhui University [J01003211]
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Illustrating the roles of electron withdrawing/donating groups upon the capacitive behaviors of p-hydroquinone (PHQ) can benefit for achieving superior supercapacitors. In present work, sulfonic acid and methoxyl group are adopted as electron withdrawing group (EWG) and electron donating group (EDG), respectively, that is, the substances of 2,5-dihydroxybenzenesulfonate (DHBS) and 2-methoxyhydroquinone (MHQ). It is revealed that PHQ, DHBS and MHQ can serve as effective redox additives in H2SO4 electrolyte, and two-proton/two-electron redox reactions occur at the electrodeelectrolyte interface. DHBS exerts higher faradaic effect than that of MHQ, implying the EWG is more active than the EDG when adhered to PHQ. Furthermore, from the point of kinetics, all the relevant redox processes are limited by semi-infinite diffusion. And high energy density of 15.6 Wh kg(-1) is obtained towards the DHBS sample with concentration of 2 mmol L-1 when measured in 1 mol L-1 H2SO4. The present work would favors for understanding other supercapacitor systems possessing electron withdrawing/donating groups. (C) 2018 Elsevier Ltd. All rights reserved.
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