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http://dx.doi.org/10.7234/composres.2022.35.6.394

Charge Storage Behavior of the Carbons Derived from Polyvinylidene Chloride-resin and Polyvinylidene Fluoride in Different pH Electrolytes  

Sang-Eun, Chun (School of Materials Science and Engineering, Kyungpook National University)
Publication Information
Composites Research / v.35, no.6, 2022 , pp. 394-401 More about this Journal
Abstract
Two polymer precursors, polyvinylidene chloride-resin (PVDC-resin) and polyvinylidene fluoride (PVDF), are assembled into the microporous carbon by pyrolysis. Microporous carbon is advantageous as an electrode for supercapacitors that store electric charges through ion adsorption/desorption. The pyrolysis also turns the various heteroatoms of two precursors into functional groups, contributing to the additional charge storage. The analysis of the porous structure and function group during carbonization are important to develop the carbon for energy storage. Here, we analyzed the functional groups of two polymer-derived carbons through X-ray photoelectron spectroscopy. The electrochemical properties of the functional groups were explored in various pH electrolytes. The specific capacitance of two carbons in the acidic electrolyte (1 M H2SO4) was improved compared to that in the neutral electrolyte (0.5 M Na2SO4) due to the faradaic charge/discharge reaction of the quinone functional group. In particular, the carbon electrode derived from PVDC-resin exhibits a lower capacity than the carbon from PVDF due to the small micropores. In the alkaline electrolyte (6 M KOH), the highest specific capacitance and rate capability were obtained among the three electrolytes for both electrodes based on the facile adsorption of the constituent electrolyte ions (K+, OH-).
Keywords
Polyvinylidene fluoride-resin (PVDF-resin); Polytetrafluoroethylene (PTFE); micropore); $Na_2SO_4$; $H_2SO_4$; KOH;
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Times Cited By KSCI : 2  (Citation Analysis)
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