4.5 Article

Microwave Synthesis of Sn-Doped NiO/CNT Composites: The Effect of Sn Incorporation on Their Supercapacitive Properties

期刊

JOURNAL OF ELECTRONIC MATERIALS
卷 50, 期 11, 页码 6102-6113

出版社

SPRINGER
DOI: 10.1007/s11664-021-09128-8

关键词

NiO/CNT composite; microwave synthesis; Sn-doping; supercapacitor

资金

  1. MHRD-RUSA, Government of India
  2. Ministry of Higher Education, Government of Tamil Nadu
  3. RUSA R&I-Phase-I component 8.0
  4. RUSA-Phase 2.0 grant [F.24-51/2014-U]

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Composite materials composed of tin-doped nickel oxide and carbon nanotubes exhibit high specific capacitance, making them suitable candidates for electrochemical supercapacitors.
Composites of metal oxide with carbonaceous materials have attracted researchers due to their high energy density and high power density. A series of tin (Sn) incorporated nickel oxide/carbon nanotube (NiO/CNT) composites are prepared by simple microwave irradiation. The chemical composition of prepared composites is analysed using various analytical techniques such as powder x-ray diffraction, micro-Raman spectroscopy, and x-ray photoelectron spectroscopy. Surface morphological studies of the composites revealed that the prepared composite has a uniform mixture of NiO nanoflakes with carbon nanotubes. Electrochemical studies of the composite electrodes in a three-electrode system demonstrate that 3% Sn-doped NiO/CNT composite has a higher specific capacitance of 238.2 F/g @ 5 mV/s scan rate than the specific capacitance of 231.8, 214.4 and 160.2 F/g @ 5 mV/s attained for 5%, 1% Sn-doped NiO/CNT and pristine NiO/CNT, respectively, in 2M potassium hydroxide (KOH) electrolyte. A high specific capacitance of 239.0 F/g @ 1 A/g current density is achieved for 3% Sn-doped NiO/CNT in galvanic discharge studies indicates that the prepared Sn-doped NiO/CNT is a suitable candidate for electrochemical supercapacitors. [GRAPHICS] .

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