화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.36, No.3, 321-325, May, 2012
Export Citation
KOH 활성화 효과에 의한 흑연나노섬유의 전기화학적 거동
Effect of KOH Activation on Electrochemical Behaviors of Graphite Nanofibers
유혜민, 민병각1, 이규환2, 변준형3, 박수진†
  • 인하대학교 화학과
  • 1충주대학교 고분자공학과
  • 2재료연구소 표면기술연구본부
  • 3재료연구소 복합재료연구센터
Hye-Min Yoo, Byung-Gak Min1, Kyu-Hwan Lee2, Joon-Hyung Byun3, and Soo-Jin Park†
  • Department of Chemistry, Inha University, 253 Yonghyun-dong, Nam-gu, Incheon 402-751, Korea
  • 1Polymer Science and Engineering, Korea National University of Transportation, Iryu Myon, Chungju 380-702, Korea
  • 2Materials Processing Division, Korea Institute of Materials Science, 66 Sangnam-dong, Changwon 641-010, Korea
  • 3Composite Materials Group, Korea Insititue of Materials Science, 66 Sangnam-dong, Changwon 641-010, Korea
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초록
본 연구에서는 화학적으로 활성 흑연나노섬유를 제조하여 그에 따른 전기화학적 거동을 확인하였다. 활성화제로 KOH를 사용하였으며, KOH와 흑연나노섬유의 비를 무게비로 각각 0, 1, 2, 4, 및 5로 처리하여 표면과 기공 특성을 연구하였고, 그에 따른 전기화학적 거동을 살펴보았다. 활성화된 흑연나노섬유의 결정구조와 표면특성은 각각 X-선 회절분석법(XRD), 주사전자현미경(SEM) 분석방법을 이용하여 확인하였으며, 기공 특성은 비표면적 장치(BET)를 이용하였으며 질소흡착 등온선에 의해 조사하였다. 전기화학적 특성은 10 mV/s의 주사속도로 순환전류전압(cyclic voltammetry)을 통한 곡선으로 고찰하였으며 정전류법(galvanostatic method)으로 측정된 충방전 곡선을 통해 비축전용량을 계산하였다. 실험 결과로부터, 활성 흑연나노섬유의 전기화학적 거동은 KOH 양이 증가함에 따라 향상되었으며, 4 배 처리된 활성 흑연나노섬유가 최대의 비축전용량을 가진 것으로 나타났다. 이것은 KOH 활성화에 의해 활성 흑연나노섬유의 비표면적과 기공부피가 증가하기 때문인 것으로 사료된다.
In this work, we prepared the activated graphite nanofibers (A-GNFs) via chemical activation with KOH/GNFs ratios in a range of 0 to 5. The effect of KOH activation was studied in the surface and pore properties of the samples for electrochemical performance. The surface properties of A-GNFs were characterized by XRD and SEM measurements. The textural properties of the A-GNFs were investigated by N2/77 K adsorption isotherms using Brunauer-Emmett-Teller (BET) equation. Their electrochemical behaviors were investigated by cyclic voltammetry and galvanostatic charge-discharge performance. From the results, electrochemical performances of the A-GNFs were improved with increasing the ratio of KOH reagent. It was found that specific surface area and total pore volume of the A-GNFs were increased by KOH activation.
Keywords:graphite nanofibers;chemical activation;electrochemical properties;specific capacitance.
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