Spectroelectrochemistry of nanostructured NiO
2001 (English)In: Journal of Physical Chemistry B, ISSN 1089-5647, Vol. 105, no 15, 3039-3044 p.Article in journal (Refereed) Published
Transparent nanostructured NiO electrodes have been prepared by heating Ni(OH)(2) sol-gel films at a temperature of 300-320 degreesC. 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 positive potentials. This effect is caused by oxidation of Ni atoms located at the NiO/electrolyte interface. Electrochemical oxidation reactions are highly reversible in both aqueous and nonaqueous electrolytes. In aqueous electrolyte, the half-potentials show a Nernstian pH dependence, whereas in nonaqueous electrolytes, the type of cation present determines the shape and position of the cyclic voltammogram.
Place, publisher, year, edition, pages
2001. Vol. 105, no 15, 3039-3044 p.
oxide semiconductor-films, nickel-oxide, electrochemical capacitors, electrochromic properties, tio2 films, solar-cell, spectroscopy, electrodes
IdentifiersURN: urn:nbn:se:kth:diva-20548ISI: 000168257700027OAI: oai:DiVA.org:kth-20548DiVA: diva2:339244
QC 201005252010-08-102010-08-10Bibliographically approved