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다른 pH의 전해질에서 polyvinylidene chloride-resin와 polyvinylidene fluoride로부터 합성된 다공성 탄소의 전하 저장 거동

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

전상은
한국복합재료학회 (The Korean Society For Composite Materials)|2022.12|Composites Research|제35권 제6호|pp. 394-401

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참고문헌

키워드

KOHPTFEH2SO4Polyvinylidene fluoride-resinPVDF-resinNa2SO4
주제분류재료공학

초록

Polyvinylidene chloride-resin(PVDC-resin)와 polyvinylidene fluoride(PVDF)의 두 폴리머 전구체는 열분해 과정을 통해 마이크로 다공성 탄소로 변환되어 되므로 이온 흡/탈착으로 전하를 저장하는 슈퍼커패시터용 전극재료로 유리하다. 더욱이, 두 전구체를 구성하는 여러가지 이종원소들은 탄화 후 작용기를 형성하여 추가적인 전하 저장에 기여할 수 있으므로, 탄화 시 생성되는 작용기에 대한 분석은 에너지 저장용 탄소소재를 개발하는데 중요하다. 본 연구에서는 두 폴리머 전구체를 탄화시킨 후 생성된 작용기를 X-선 광전자 분광법(X-ray photoelectron spectroscopy)과 다양한 pH의 전해질에서 탄소 전극의 전기화학 거동 관찰을 통하여 확인하였다. 산성(1 M H2SO4) 전해질에서 측정된 두 탄소 전극의 비전기용량은 생성된 quinone 작용기의 패러데익 충/방전 반응 덕분에 중성 전해질(0.5 M Na2SO4)에서보다 증가하였다. 특히, PVDC-resin으로부터 합성된 탄소는 매우 작은 마이크로 기공이 표면에 형성되어 있어 전해질 이온의 흡착을 어렵게 하므로, PVDF로부터 합성된 탄소 전극에 비해 낮은 용량을 보인다. 염기성 전해질(6 M KOH)에서 두 탄소 전극 모두 3가지 전해질 중 가장 높은 비전기용량이 측정되었는데, 이는 구성하는 전해질 이온들(K+, OH−)이 두 탄소에 형성된 마이크로 기공으로 흡/탈착이 용이하게 일어나는 동시에 패러데이 충/방전 반응으로 추가적인 전하가 저장되었기 때문이다.

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+I6 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−).

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슈퍼 커패시터용 전극을 위한 Polyvinylidene chloride(PVDC)-resin과 Mg(OH)2 템플릿으로부터 메조기공 탄소의 제조전상은, 황버들한국표면공학회 · 한국표면공학회지2019 · 제52권 제6호Polyvinylidene chloride-resin 전구체와 ZnO 활성화제 비율 제어를 통한 슈퍼커패시터용 활성탄 전극 특성 최적화 연구전상은한국표면공학회 · 한국표면공학회지2024 · 제57권 제5호Supercapacitor 전극 용 최적의 mesoporous carbon 합성을 위한 PVDC-resin 전구체로 부터 CuO를 이용한 화학적 활성화 과정 연구전상은한국표면공학회 · 한국표면공학회지2024 · 제57권 제4호The Influence of Carbonization Temperature and KOH Activation Ratio on the Microporosity of N-doped Activated Carbon Materials and Their Supercapacitive Behaviors박수진, 손영래, 조은아, 허영정한국복합재료학회 · Composites Research2018 · 제31권 제5호전기이중층 커패시터용 질소성 작용기를 이용한 개질 활성탄의 전기화학적 특성김한주, 박수길, 양정진, 육영재, 최영주한국전기화학회 · 전기화학회지2013 · 제16권 제2호전기화학캐패시터용 MWNT 및 MWNT/DAAQ 나노 복합체의 제조 및 전기화학적 거동김홍일, 박수길한국전기화학회 · 전기화학회지2007 · 제10권 제3호

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