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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 발행연도
- 2017
- 저작권
- 서울과학기술대학교 논문은 저작권에 의해 보호받습니다.
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Polyacrylonitrile (PAN) nanofibers were fabricated by electrospinning and aligned by controlling the rotary collector’s speed (250 and 2000 rpm). The prepared PAN nanofibers were carbonized under nitrogen atmosphere in tube furnace. After that, MnO2, Co3O4, and NiCo2O4 were deposited respectively on the aligned carbon nanofibers (ACNFs) in order to elevate the electrochemical properties of ACNFs by using both effect of double layer and redox reaction. The improved electrochemical performances of the electrodes were investigated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) testing, and electrochemical impedance analysis. Among the electrodes, ACNFs which were deposited by NiCo2O4 for 10 s deposited sample had the highest specific capacitance value (90.1 F g-1 at 5 mV s-1), good rate capability (64.68 %), and cycle stability (85.24 % after 1000 cycles). It means that, ACNFs covered with NiCo2O4 during 10 s showed best behavior as a supercapacitor electrode rather than ACNFs which was deposited by MnO2, Co3O4 and randomly oriented carbon nanofibers covered with NiCo2O4. These results suggested that carbon nanofibers could be improved their electrochemically properties by using effects of aligned nanofibers and redox reaction of NiCo2O4.
목차
1. INTRODUCTION ..................................................022. EXPERIMENTAL .................................................062.1 Materials .........................................................062.2 Synthesis of electrode materials..........................062.3 Characterization ................................................083. RESULTS AND DISCUSSION..................................103.1 ACNFs which is deposited various metal oxide.....103.2 ACNFs deposited by NiCo2O4............................ 123.3 CNFs deposited by Co3O4 and RCNFs deposited by NiCo2O4...........204. CONCLUSIONS....................................................23
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