Spectroelectrochemistry of Nanostructured NiO

Transparent nanostructured NiO electrodes were prepd. by heating Ni(OH)2 sol-gel films at 300-320°. Nanostructured NiO (bunsenite) behaves as a p-type semiconductor and has an indirect band gap of 3.55 eV. It shows a strong anodic electrochromic effect, as it changes color from transparent to brown-black upon application of pos. potentials. This effect is caused by oxidn. of Ni atoms located at the NiO/electrolyte interface. Electrochem. oxidn. reactions are highly reversible in both aq. and nonaq. electrolytes. In aq. electrolyte, the half-potentials show a Nernstian pH dependence, whereas in nonaq. electrolytes, the type of cation present dets. the shape and position of the cyclic voltammogram.


Published in:
Journal of Physical Chemistry B, 105, 3039-3044
Year:
2001
ISSN:
1089-5647
Keywords:
Laboratories:




 Record created 2015-07-06, last modified 2018-09-13


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