Characterization of honeycomb-like “β-Ni(OH)2” thin films synthesized by chemical bath deposition method and their supercapacitor application
✍ Scribed by U.M. Patil; K.V. Gurav; V.J. Fulari; C.D. Lokhande; Oh Shim Joo
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 764 KB
- Volume
- 188
- Category
- Article
- ISSN
- 0378-7753
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✦ Synopsis
Nanostructured nickel hydroxide thin films are synthesized via a simple chemical bath deposition (CBD) method using nickel nitrate Ni(NO 3 ) 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 a working electrode in a three-electrode electrochemical cell containing 2 M KOH electrolyte with a platinum counter electrode and a saturated calomel reference electrodes. A specific capacitance of ∼398 × 10 3 F kg -1 is obtained.