The oxygen evolution on La0.5Ba0.5CoO3

Kobussen, A.G.C.; Broers, G.H.J.

doi:10.1016/s0022-0728(81)80430-5

Cited by 62 publications

(49 citation statements)

References 6 publications

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“…By assuming the second (chemical) quasi-equilibrium to lie far to the left in the entire overpotential region, the surface concentration of O becomes extremely low so that steps (2) and (3), or alternatively (2) and (3a), effectively merge into a single (quasi-equilibrium) step. From our previously reported experiments [4,5], it was concluded that the O atom adsorption involves low fractional surface coverages only, but the adsorption of, for example, OH radicals leading to a broad pseudo-capacitance maximum points to appreciable Frumkin-type interactions. However, a number of observations from earlier experiments are left unexplained by this mechanism, and these are summarized below.…”

Section: O£=oad+ementioning

confidence: 99%

“…In these experiments a noticeable hysteresis was found. Later the impedance response [3,4] and the overpotential decay behaviour [5] were studied with particular attention to the adsorption behaviour and occurrence of intermediates. The final conclusion of these studies was that the actual evolution mechanism can be described by OH ~ OHad + e OHad + OH-~ O~d + H20…”

Section: Introductionmentioning

confidence: 99%

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The oxygen evolution on La0.5Ba0.5CoO3 Passivation processes

Kobussen

1982

Journal of Electroanalytical Chemistry

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Section: O£=oad+ementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The oxygen evolution on La0.5Ba0.5CoO3 Passivation processes

Kobussen

1982

Journal of Electroanalytical Chemistry

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“…This approach will be applied to two mechanisms recently proposed for oxygen evolution at La0.sBa0.sCoO 3 [5,7,8]. Numerically obtained characteristic plots will be shown, since in general no analytical solutions can be derived.…”

Section: ----Blog(bc/23io) -B Log(t + R)mentioning

confidence: 99%

“…The mechanisms to be discussed are the Krasil'shchikov mechanism and the peroxide mechanism involving two intermediates [7,8]. In the following scheme both are shown:…”

Section: (12) Derivation Of the Theoretical Modelmentioning

confidence: 99%

“…Furthermore, Frumkin-type adsorption will be adopted, with an overall interaction parameter g describing the interaction effect of the adsorbates via the total surface coverage, as discussed earlier [8]. The overpotential decay for the Krasil'shchikov mechanism can be derived from that of the more complex peroxide mechanism, so the latter will be treated first.…”

Section: Peroxide Mechanismmentioning

confidence: 99%

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The oxygen evolution on La0.5Ba0.5CoO3 Overpotential decay behaviour: theory and experimental results

Kobussen

1982

Journal of Electroanalytical Chemistry

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In section (I) the overpotential decay behaviour of an electrode during oxygen evolution is described on the basis of calculations for two mechanisms with a chemical rate-determining step (rds). Quasi-equilibrium in the steps preceding the rds and Frumkin-type adsorption of intermediates is assumed. In section (II) decay experiments are reported for oxygen evolution on Lao.sBa0.sCoO 3 in 6 M KOH solution at room temperature. Both aged and renewed oxide electrodes were used. Measured decay rates at constant overpotential were found to vary as a function of starting overpotential, while the theory requires equal rates. Also, an increased capacitance for the aged electrode with respect to the renewed one was not accompanied by an expected increase in current density. Neither phenomenon can be explained by assuming non-equilibrium in the mechanism, but can be understood on the basis of a growing passive multilayer with a presumably enhanced ColV/Com-ratio. The peroxide mechanism with a chemical rds and low coverage of the second intermediate is the most likely of the alternatives considered. Capacitances calculated from the initial overpotential decay were approximately equal to capacitances derived from ac impedances measured prior to the interruption. (I) THEORETICAL DESCRIPTION OF THE OVERPOTENTIAL DECAY (I. 1) IntroductionMeasurement of the (open-circuit) overpotential decay of an electrochemical cell after steady-state potentiostatic polarization was used to characterize the oxygen evolution process on Lao.sBa0.sCoO3. This method was originally developed to study the discharge of an ionic double-layer capacitance [ 1 ], but was later also used for the characterization of oxygen evolution at nickel (oxide) electrodes [2] and of chlorine evolution [3]. The method can give kinetic information equivalent to that

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Nitrogen‐Rich Carbonaceous Materials for Advanced Oxygen Electrocatalysis: Synthesis, Characterization, and Activity of Nitrogen Sites

Meng

Morales

et al. 2022

Adv Funct Materials

103

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Nitrogen‐doped carbons are among the fastest‐growing class of materials used for oxygen electrocatalysis, namely, the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), thanks to their low cost, environmental friendliness, excellent electrical conductivity, and scalable synthesis. The perspective of replacing precious metal‐based electrocatalysts with nitrogen‐doped carbon is highly desirable for reducing costs in energy conversion and storage systems. In this review, the role of nitrogen and N‐induced structural defects on the enhanced performance of N‐doped carbon electrocatalysts toward the OER and the ORR as well as their applications for energy conversion and storage technologies is summarized. The synthesis of N‐doped carbon electrocatalysts and the characterization of their nitrogen functional groups and active sites for the conversion of oxygen are also reviewed. The electrocatalytic performance of the main types of N‐doped carbon materials for OER/ORR electrocatalysis are then discussed. Finally, major challenges and future opportunities of N‐doped carbons as advanced oxygen electrocatalysts are highlighted.

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The oxygen evolution on La0.5Ba0.5CoO3

Cited by 62 publications

References 6 publications

The oxygen evolution on La0.5Ba0.5CoO3 Passivation processes

The oxygen evolution on La0.5Ba0.5CoO3 Passivation processes

The oxygen evolution on La0.5Ba0.5CoO3 Overpotential decay behaviour: theory and experimental results

Nitrogen‐Rich Carbonaceous Materials for Advanced Oxygen Electrocatalysis: Synthesis, Characterization, and Activity of Nitrogen Sites

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