Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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A Facile synthesis of CoS by Successive Ionic Layer Adsorption and Reaction (SILAR) Process for Supercapacitors

스테인리스강 기판에 연속 이온 층 흡착 및 반응 (SILAR) 공정을 통한 CoS 코팅 및 슈퍼캐패시터 전극 특성

  • Kim, Jaeseung (Department of Chemistry and Chemical Engineering, Inha University) ;
  • Lee, Jaewon (Research Institute of Environmental Science & Technology, Kyungpook National University) ;
  • Kumbhar, Vijay S. (Research Institute of Environmental Science & Technology, Kyungpook National University) ;
  • Choi, Jinsub (Department of Chemistry and Chemical Engineering, Inha University) ;
  • Lee, Kiyoung (Research Institute of Environmental Science & Technology, Kyungpook National University)
  • 김재승 (인하대학교 화학 및 화학공학 융합학과) ;
  • 이재원 (경북대학교 환경과학기술연구소) ;
  • ;
  • 최진섭 (인하대학교 화학 및 화학공학 융합학과) ;
  • 이기영 (경북대학교 환경과학기술연구소)
  • Received : 2019.05.18
  • Accepted : 2019.06.18
  • Published : 2019.06.30
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Abstract

In this study, the cobalt sulfide (CoS) nanosheet on stainless steel as a supercapacitor electrode is synthesized by using a facile successive ionic layer adsorption reaction (SILAR) method. The number of cycles for dipping and rinsing can control the nanosheet thickness of CoS on stainless steel. Field emission-scanning electron microscopy (FE-SEM) showed a layer structure of CoS particles coupled as agglomeration. And x-ray diffraction (XRD) showed the crystallinity of the CoS nanosheet. To investigate the characteristics of the CoS nanosheet electrode as the supercapacitor, analysis of electrochemical measurement was conducted. Finally, the CoS nanosheet of 70cycles on stainless steel shows the specific capacitance ($44.25mF/cm^2$ at $0.25mA/cm^2$) with electrochemical stability of 78.5% over during 2000cycles.

Keywords

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Fig. 1. Schematic of successive ionic layer adsorption and reaction (SILAR) system of CoS deposition onto stainless steel substrate

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Fig. 2. Digital photographs of the (a) CoS-50, (b) CoS-60, (c) CoS-70, and (d) CoS-80 samples deposited onto stainless steel substrate

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Fig. 3. FESEM images of the (a) CoS-50, (b) CoS-60, (c) CoS-70, and (d) CoS-80 samples deposited onto stainless steel substrate

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Fig. 4. X-ray diffraction pattern of the CoS-70 sample

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Fig. 5. CV curves of CoS nanosheet at constant 3 M KOH electrolyte according to scan rates (5 mV/s, 10 mV/s, 20 mV/s, 50 mV/s, and 100 mV/s); (a) 50 cycles; (b) 60 cycles; (c) 70 cycles (d) 80 cycles.

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Fig. 6. Galvanostatic charge-discharge curves of the (a) CoS-50, (b) CoS-60, (c) CoS-70, and (d) and CoS-8-electrodes at various current densities, (e) variation of the specific capacitance of the CoS-70 electrode at various current densities and (c) cycling stability of the CoS-70 electrode for 2000 charge-discharge cycles at 0.5 mA/cm2 current density.

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Fig. 7. Nyquist plots of CoS electrodes; (a) CoS-50, (b) CoS-60, (c) CoS-70, and (d) CoS-80; Rs-equivalent series resistance; Rct - charge transfer resistance; W - Warburg impedance factor; CPE - constant phase element.

Table 1. Fitted electrochemical impedance parameters of the CoS-70 electrode prepared with the 70 SILAR cycles

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