Comparative dissolution rates of defective nickel oxides from different sources

Article

Pease, Wayne, Segall, Robert L., Smart, Roger St. C. and Turner, Peter S.. 1986. "Comparative dissolution rates of defective nickel oxides from different sources." Journal of the Chemical Society, Faraday Transactions I: Physical Chemistry in Condensed Phases. 82 (3), pp. 759-766. https://doi.org/10.1039/F19868200759
Article Title

Comparative dissolution rates of defective nickel oxides from different sources

ERA Journal ID1219
Article CategoryArticle
AuthorsPease, Wayne (Author), Segall, Robert L. (Author), Smart, Roger St. C. (Author) and Turner, Peter S. (Author)
Journal TitleJournal of the Chemical Society, Faraday Transactions I: Physical Chemistry in Condensed Phases
Physical Chemistry Chemical Physics
Journal Citation82 (3), pp. 759-766
Number of Pages8
Year1986
PublisherThe Royal Society of Chemistry
Place of PublicationCambridge, United Kingdom
ISSN1463-9076
1463-9084
Digital Object Identifier (DOI)https://doi.org/10.1039/F19868200759
Web Address (URL)http://www.rsc.org/publishing/journals/article.asp?doi=F19868200759
Abstract

Dissolution rates in acidic solution of nickel oxide prepared in air from carbonate and hydroxide salts at 550, 700, 1100 and 1450 °C are compared. The powders were pre-characterised by thermal analysis, B.E.T. surface area measurement, transmission electron microscopy, X-ray and electron diffraction and infrared spectroscopy. The carbonate decomposition process is considerably more energetic than that of the hydroxide. The rates per unit surface area for the ex-carbonate oxide are more than five times higher than those for the ex-hydroxide oxide at 550, 700 and 1100 °C annealing temperatures, but comparable at 1450 °C. The 700 °C ex-carbonate oxide shows anomalously high, initial rates, at <10 monolayer-equivalents removed, attributed to surface reduction. All samples show increases in rate with extent of dissolution owing primarily to surface roughening and increased kink site densities. The results are discussed in relation to excess (over equilibrium) surface and bulk defect concentrations introduced by decomposition proces, and modified by subsequent annealing.

Keywordsdissolution studies; thermal kinetics; defect concentrations; surface area studies
ANZSRC Field of Research 2020340602. Chemical thermodynamics and energetics
340603. Colloid and surface chemistry
340399. Macromolecular and materials chemistry not elsewhere classified
340601. Catalysis and mechanisms of reactions
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Byline AffiliationsGriffith University
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