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Received June 19, 2014
Accepted August 24, 2014
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양극전착을 통한 그래핀-바나듐 산화물 복합체 제조 및 전기화학적 특성평가
Electrochemical Properties of Graphene-vanadium Oxide Composite Prepared by Electro-deposition for Electrochemical Capacitors
충북대학교 화학공학과, 362-763 충북 청주시 서원구 충대로 1
Department of Chemical Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-gu, Cheongju, Chungbuk 362-763, Korea
smjeong@chungbuk.ac.kr
Korean Chemical Engineering Research, April 2015, 53(2), 131-136(6), 10.9713/kcer.2015.53.2.131 Epub 30 March 2015
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Abstract
본 연구에서는 전극 활물질로서 그래핀-바나듐 산화물 복합체를 pH 1.8 조건에서 0.5M VOSO4 수용액을 이용하여 전기화학적 전착을 이용해 합성하였다. 전착공정 후 다공성 바나듐 산화물이 작업전극에 생성된 것을 SEM, XRD, XPS를 통해 확인하였으며 생성된 바나듐 산화물은 V5+와 V4+로 존재한다. 그래핀에 전착된 바나듐 산화물의 직경 약 100 nm의 나노로드로 이루어진 망상 구조는 전극과 전해질과의 접촉을 향상시킨다. 4000 초의 전착공정을 거친 그래핀-바나듐 산화물 복합체를 작업전극으로 하여 3전극 셀에서 전기화학적 특성을 평가한 결과 20 mV/s의 주사속도에서 854 mF/cm2의 높은 정전용량을 나타내었고 1000회 충방전 후 초기 용량의 53%가 유지되었다.
The nanostructural graphene/vanadium oxide (graphene/V2O5) composite with enhanced capacitance was synthesized by the electro-deposition in 0.5 M VOSO4 solution. The morphology of composites was characterized using scanning electron microscopy (SEM), x-ray diffraction pattern (XRD), and x-ray photoelectron spectroscopy (XPS). The oxidation states of the electro-deposited vanadium oxide was found to be V5+ and V4+. The morphology of the prepared graphene/V2O5 composite exhibits a netlike nano-structure with V2O5 nanorods in about 100 nm diameter, which could lead a better contact between electrolyte an electrode. The composite with a deposition time of 4,000 s exhibits the specific capacitance of 854 mF/cm2 at a scan rate of 20 mV/s and the capacitance retention of 53% after 1000 CV cycles.
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