Characterization of honeycomb-like “β-Ni(OH)2” thin films synthesized by chemical bath deposition method and their supercapacitor application
- Characterization of honeycomb-like “β-Ni(OH)2” thin films synthesized by chemical bath deposition method and their supercapacitor application
- 파틸; 구라브; 플라리; 록핸드; 주오심
- Nickel hydroxide thin film; chemical bath deposition; Optical properties; electrical properties; surface morphology; supercapacitor behaviour
- Issue Date
- Journal of power sources
- VOL 188, NO 1, 338-342
- Nanostructured nickel hydroxide thin films are synthesized via a simple chemical bath deposition (CBD) method using nickel nitrate Ni(NO3)2 as the starting material. The deposition process is based on the thermal decomposition of ammonia-complexed nickel ions at 333 K. The structural, surface morphological, optical, electrical and electrochemical properties of the films are examined. The nanocrystalline “ ” phase of Ni(OH)2 is confirmed by the X-ray diffraction analysis. Scanning electron microscopy reveals a macroporous and interconnected honeycomb-like morphology. Optical absorption studies show that “ -Ni(OH)2” has a wide optical band-gap of 3.95 eV. The negative temperature coefficient of the electrical resistance of “ -Ni(OH)2”, is attributed to the semiconducting nature of the material. The electrochemical properties of “ -Ni(OH)2” in KOH electrolyte are examined by cyclic voltammetric (CV) measurements. The scan-rate dependent voltammograms demonstrate pseudocapacitive behaviour when “ -Ni(OH)2” is employed as aworking electrode in a three-electrode electrochemical cell containing 2MKOHelectrolyte with a platinum counter electrode and a saturated calomel reference electrodes. A specific capacitance of ∼398×103 Fkg−1 is obtained.
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