Electrocatalysis of anodic and cathodic oxygen-transfer reactions

dc.contributor.advisor Dennis C. Johnson
dc.contributor.author Wels, Brian
dc.contributor.department Chemistry
dc.date 2018-08-15T09:36:53.000
dc.date.accessioned 2020-07-02T06:16:26Z
dc.date.available 2020-07-02T06:16:26Z
dc.date.copyright Mon Jan 01 00:00:00 UTC 1990
dc.date.issued 1990
dc.description.abstract <p>The electrocatalysis of oxygen-transfer reactions is discussed in two parts. In Part I, the reduction of iodate (IO[subscript]sp3-) is examined as an example of cathodic oxygen transfer. On oxide-covered Pt electrodes (PtO), a large cathodic current is observed in the presence of IO[subscript]sp3- to coincide with the reduction of PtO. The total cathodic charge exceeds the amount required for reduction of PtO and IO[subscript]sp3- to produce an adsorbed product. An electrocatalytic link between reduction of IO[subscript]sp3- and reduction of PtO is indicated;In addition, on oxide-free Pt electrodes, the reduction of IO[subscript]sp3- is determined to be sensitive to surface treatment. The results are consistent with a mechanism involving the adsorption of IO[subscript]sp3- onto I°-covered Pt sites (Pt(I[subscript]sp ads∘)). Previous researchers have relied on chemical steps in the mechanism of IO[subscript]sp3- reduction to account for their results;The electrocatalytic oxidation of CN[superscript]- is presented as an example of anodic oxygen transfer in Part II. The electrocatalytic oxidation of CN[superscript]- is considered to be an important process for the treatment of industrial and laboratory wastes. Present electrode materials are unsuitable for CN[superscript]- oxidation for reasons of low current efficiency and high attrition rates. The voltammetric response of CN[superscript]- is virtually nonexistent at PbO[subscript]2 electrodes. Whereas the response is not improved by doping PbO[subscript]2 with Bi, the response is significantly improved by doping PbO[subscript]2 with Cu. Cyanide is also oxidized effectively at CuO-film electrodes. Copper is concluded to serve as an adsorption site for CN[superscript]-. It is proposed that an oxygen tunneling mechanism comparable to electron tunneling does not occur at the electrode-solution interface. The adsorption of CN[superscript]- is therefore considered to be a necessary prerequisite for oxygen transfer. ftn*DOE Report IS-T 1450. This work was performed under contract No. W-7405-eng-82 with the U.S. Department of Energy.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/9909/
dc.identifier.articleid 10908
dc.identifier.contextkey 6371616
dc.identifier.doi https://doi.org/10.31274/rtd-180813-12854
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/9909
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/83059
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/9909/r_9110582.pdf|||Sat Jan 15 02:39:28 UTC 2022
dc.subject.disciplines Analytical Chemistry
dc.subject.keywords Chemistry
dc.subject.keywords Analytic
dc.subject.keywords Chemistry
dc.subject.keywords Analytical chemistry
dc.title Electrocatalysis of anodic and cathodic oxygen-transfer reactions
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 42864f6e-7a3d-4be3-8b5a-0ae3c3830a11
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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