A study of the electrochemical redox behavior of electrochemically precipitated nickel hydroxides using electrochemical quartz crystal microbalance
- Yonsei Univ., Seoul (Korea, Republic of). Dept. of Metallurgical Engineering
Nickel hydroxides are an important material with applications in nickel-based batteries, fuel cells, electrolyzers, and electrosynthesis and electrochromic devices. The electrochemical behavior of nickel hydroxides has been studied extensively because of their application in nickel-cadmium and nickel-metal hydride batteries. Electrochemical redox reactions of electrochemically precipitated thin films of nickel hydroxide have been studied by an electrogravimetric method with the aid of electrochemical quartz crystal microbalance. Cyclic voltamassograms show that in alkaline solutions {alpha}-Ni(OH){sub 2} gains mass during its oxidation and loses moss during reduction. The mass change of {alpha}-Ni(OH){sub 2} film is explained by the process of intercalation and deintercalation involving K{sup +} and H{sup +} ions. {beta}-Ni(OH){sub 2} film, on the other hand, shows a mass change behavior completely opposite to that of {alpha}-Ni(OH){sub 2}, losing mass during oxidation and gaining mass during reduction. Its mass change is explained by the intercalation and deintercalation of H{sup +} ions. Phase transformation from {alpha}-Ni(OH){sub 2} to {beta}-Ni(OH){sub 2} is found to proceed with a formation of intermediate phases. The cyclic voltammograms taken during the phase transformation show that the intermediate phases behave as single phases. Cyclic voltamassograms taken simultaneously, however, show that the intermediate phases behave as a microscopic mixture of {alpha}-Ni(OH){sub 2} and {beta}-Ni(OH){sub 2}.
- Sponsoring Organization:
- Korea Ministry of Education (Korea)
- OSTI ID:
- 511936
- Journal Information:
- Journal of the Electrochemical Society, Vol. 144, Issue 5; Other Information: PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
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