Untersuchung des anodischen aufbaus und der kathodischen reduktion der sauerstoffbelegung am rhodium und iridium

Bold, W. A. van den; Bréiter, M.W.

doi:10.1016/0013-4686(61)85013-5

Cited by 69 publications

(18 citation statements)

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“…The results obtained from experiments with the monohydrate were similar to those previously reported in this laboratory (3) and the voltammetric sweeps in sulfuric acid were identical to those reported in the literature (8). The results obtained from experiments with the monohydrate were similar to those previously reported in this laboratory (3) and the voltammetric sweeps in sulfuric acid were identical to those reported in the literature (8).…”

Section: Resultssupporting

confidence: 89%

Evaluation of Organic Acids as Fuel Cell Electrolytes

Ahmad

Nguyen

Foley

1981

J. Electrochem. Soc.

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The electrochemical behavior of methanesulfonic acid, ethanesulfonic acid, and sulfoacetic acid as fuel cell electrolytes was studied in a half-cell at variou,s temperatures. The rate of the electro-oxidation of hydrogen at 115~ was very high in methanesulfonic acid. The rate of the electro-oxidation of propane in all three acids was low even at 135~ Further, there is evidence for adsorption of these acids on the platinum electrode. It was concluded that anhydrous sulfonic acids are not good electrolytes; water solutions are required. Sulfonic acids containing unprotected carbon-hydrogen bonds are adsorbed on platinum and probably decompose during electrolysis. A completely substituted (fluorinated) sulfonic acid would be the preferred electrolyte.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 138.251.14.35 Downloaded on 2015-05-16 to IP

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Section: Resultssupporting

confidence: 89%

Evaluation of Organic Acids as Fuel Cell Electrolytes

Ahmad

Nguyen

Foley

1981

J. Electrochem. Soc.

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“…The pH dependence of such a process would be --RT/F, which is consistent with that experimentally observed (2). Again, in such a case a pH dependence of --RT/F would be expected, as is observed (2). Again, in such a case a pH dependence of --RT/F would be expected, as is observed (2).…”

Section: Pt + Hzo ~ Ptoh -T-h + + E-[a]supporting

confidence: 88%

“…It is clear that if Eq. [2]. [1], then the potential of the peak maximum, E' --Eo + Ctmax, where tmax is the elapsed time to the peak maximum, is constant, and is thus independent of c, the sweep rate.…”

Section: Previous Analyses Of the Potential Sweep Methodsmentioning

confidence: 99%

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Theory of Successive Electron Transfer Steps in Cyclic Voltammetry: Application to Oxygen Pseudocapacitance on Platinum

Appleby

1973

J. Electrochem. Soc.

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Previous work on the theory of the cyclic voltammetric (potential sweep) method is reviewed. In cases where a multielectron reaction occurs, it is shown that simple kinetic assumptions (that all electrons are transferred in a single step or that all steps save one are in pseudoequilibrium) are likely to lead to erroneous interpretations. The most fundamental parameter is (in the irreversible case) the variation of the peak maximum potential with log sweep rate. This will enable the rate-determining step to be located in the reaction sequence. The transfer coefficient and Temkin parameters determined from the peak shape are not necessarily those of the rate-determining step, but those of the potential-determining step. Results are applied to adsorbed oxygen film formation and reduction on platinum. It is shown that a two-stage reaction occurs, with the rate constant of the first anodic step (--OH formation) falling exponentially with coverage. This is associated with a rearrangement of the surface phase, accompanied by very rapid --O formation. In the cathodic direction, the position and shape of the peak is governed by the kinetic parameters of --O reduction, whereas --OH reduction is rate-determining. There is evidence that the heterogeneity factor and the free energy of the --O reduction step depend on coverage [cf. Ref. (6)]. The same mechanism may apply to palladium and rhodium and perhaps also to gold. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.210.126.199 Downloaded on 2015-06-17 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.210.126.199 Downloaded on 2015-06-17 to IP Vol. I20, No. 9 * Electrochemical Society Active Member.

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“…An observation that, unlike other noble metals like platinum and rhodium, the shape of cyclic voltammograms (CVs) taken from iridium depends on the electrode prehistory was made by Böld and Breiter as early as 1961 [5]. Except of a possible metal lattice extension as a result of anodic treatment, early suggested by the authors for Pt [6], no explanation was given to explain the observed phenomena at that time.…”

Section: Introductionmentioning

confidence: 95%