Development of NiS@f-MWCNT nanocomposite-based high-performance supercapacitor coin cell prototype device
2023; Elsevier BV; Volume: 75; Linguagem: Inglês
10.1016/j.est.2023.109404
ISSN2352-1538
AutoresK.P. Shwetha, M.K. Sudha Kamath, Yash Athreya, Chandresh Kumar Rastogi, Kathyayini Nagaraju, Ajit Khosla, C. Manjunatha,
Tópico(s)Conducting polymers and applications
ResumoThis work reports the fabrication of supercapacitor coin cell prototype devices using lab-made NiS@f-MWCNT, their in-depth physical and electrochemical characterization, and the design of Arduino-based set-up to power temperature sensor. A one-step hydrothermal technique was developed to rationally synthesize bare NiS and f-MWCNT decorated NiS nanocomposites (NiS@f-MWCNT) using CTAB as a surfactant. Loading of f-MWCNT into NiS resulted in an enhancement in electrochemical characteristics. The specific capacitance values are found to be 1400 Fg−1 and 1966 Fg−1 (at 1 Ag−1) for bare NiS and NiS@f-MWCNT, respectively. Further, an improvement in rate capability is also noticed in the case of the f-MWCNT loaded sample (78.0 %) vis-à-vis bare NiS (64.0 %). The as-prepared NiS and NiS@f-MWCNT were utilized as the positive electrode while activated carbon (AC) as a negative electrode to fabricate distinct asymmetric supercapacitor coin cells, namely NiS//AC and NiS@f-MWCNT//AC, respectively. The as-fabricated NiS@f-MWCNT//AC supercapacitors exhibited a high energy density of ∼74.1 Whkg−1 (vis-à-vis 58.0 Whkg−1 for NiS//AC) and power density of 1405.0 Wkg−1 (vis-à-vis 850.0 Wkg−1 for NiS//AC), respectively. In addition, four ASCs composed of NiS@f-MWCNT//AC were used in demonstrating the hands-on process for powering an Arduino-driven temperature sensor. The as-developed set-up was sensitive enough to record a minor temperature fluctuation with an accuracy of ±1 °C.
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