Electrochemical Oscillations (Named Oscillations H and K) during H<sub>2</sub>O<sub>2</sub> Reduction on Pt Electrodes Induced by a Local pH Increase at the Electrode Surface

Okada, Haruki; Mizuochi, Ryusuke; Sakurada, Yuri; Nakanishi, Shuji; Mukouyama, Yoshiharu

doi:10.1149/1945-7111/ac14d8

Cited by 4 publications

(3 citation statements)

References 43 publications

(105 reference statements)

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“…The versatility of the bipolar design thus allows changing electrolyte concentration and tuning the local dynamics and coupling independently. With other electrochemical systems (e.g., H 2 O 2 reduction (Okada et al, 2021)), it could also be possible to study nonlinear cathodic systems and couple them on the anode side of the bipolar electrode. Exploring the interactions between the cathodes and the anodes could also find applications in fuel cells designs where the anodic electrode potential oscillations were shown to affect electrode potential variations of the cathode (Nogueira et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Synchronization of two electrochemical oscillators in a closed bipolar cell

Tetteh,

Kiss

2024

Front. Complex Syst.

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We investigate the dynamical behavior of the oscillatory electrodissolution of nickel and hydrogen reduction reaction in a closed electrochemical bipolar cell with two nickel wires. In the bipolar setup, two-half U cells are separated by an epoxy plate with the two embedded nickel electrodes; the oxidation and reduction reactions take place at the two ends of the same wire. The electrode potential oscillations were found to be strongly synchronized with 1 mm diameter electrodes in an in-phase configuration. Because experiments in similar configurations with traditional (three-electrode) cell showed no synchronization of the oscillatory anodic nickel electrodissolution, the introduction of the cathodic side of the bipolar electrodes induced the synchronization. The results were interpreted with a model that considered the kinetically coupled cathode-anode dynamics as well as interactions on the cathode and the anode side through migration current mediated potential drops in the electrolyte. The electrical coupling strength was calculated from solution resistance and charge transfer resistance measurements. The theory correctly interpreted that the bipolar cell with large (1 mm diameter) electrodes exhibits strong coupling with synchronization, and the bipolar cell with small (0.25 mm diameter) electrodes and the traditional configuration exhibit weak coupling and thus desynchronization. The experiments demonstrate the use of bipolar electrochemical cells for the investigation of collective behavior of electrochemical processes and the proposed approach holds promise for the design of bipolar multi-electrode arrays with engineered coupling to promote sensing and information processing using microchips.

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Section: Discussionmentioning

confidence: 99%

Synchronization of two electrochemical oscillators in a closed bipolar cell

Tetteh,

Kiss

2024

Front. Complex Syst.

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“…This model is a simple but effective tool for studying electrochemical oscillations. [48][49][50] ODEs for simulating I−U relationships.-In the simulation, the rate constants for the electrochemical reactions k i , which are functions of the true electrode potential (E), are expressed by the Butler-Volmer equation…”

Section: Numerical Simulationmentioning

confidence: 99%

Corrosion Potential Oscillation of Iron Electrodes in Nitric Acid

Sato,

Kuge,

Nakanishi

et al. 2023

J. Electrochem. Soc.

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Although iron dissolves in diluted nitric acid solutions, it does not dissolve in concentrated solutions because of surface passivation. When a small amount of water is added to a concentrated solution, the dissolution and passivation of iron occur alternately, and the amount of gaseous products generated by nitric acid reduction varies in an oscillatory manner. During the corrosion process, the corrosion potential of iron oscillates spontaneously. In this study, we investigated the factors that cause oscillations in corrosion potential through electrochemical measurements using a three-electrode system and numerical simulations. The study revealed that an N-shaped negative differential resistance characteristic of iron oxidation plays a vital role in the oscillation of the corrosion potential and, simultaneously, the reduction of nitric acid results in oscillation. We considered metal corrosion has essential factors resulting in oscillatory instability. Thus, the corrosion potentials of various metals are expected to oscillate spontaneously under the appropriate conditions.

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“…On the other hand, small inorganic ions such as S 2− , SO 3 2− , Br − , IO 3 − , MnO 4 − , NO 3 − and S 2 O 3 2− have been shown to support dynamic behavior during oxidation/reduction processes. [29][30][31][32][33][34][35][36] A crucial feature of electrochemical systems which exhibit oscillations in the observed current and/or potential is the presence of negative differential resistance (NDR), which manifests as an N-shaped curve in its current-potential characteristics. 30 In systems which possess NDR, the double layer potential plays the role of positive (autocatalytic) feedback and the negative feedback is routinely supplied through electrode surface coverage or concentration changes of electroactive species at the electrode surface.…”

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confidence: 99%

Complex Dynamic Behavior During the Electro-Reduction of Bromate Ions

Glasco¹,

Sheelam²,

Bell³

2022

J. Electrochem. Soc.

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This article describes the electrochemical reduction of bromate ions in strongly alkaline media on platinum electrodes. Bromates’ importance stems from its wide use in a variety of industrial processes, its incorporation into energy storage devices, as well as its known toxicity, which has led to it being designated as a human carcinogen. Interestingly, during the electro-reduction of bromate in alkaline solutions sustained oscillatory behavior was observed in both current and potential under both potentiostatic and galvanostatic control. Mechanistic characterization using electrochemical impedance spectroscopy (EIS) lead to the discovery that the oscillatory behavior is driven by the presence of a negative differential resistance (NDR). The EIS measurements allowed for the classification of the bromate oscillator into the HN-NDR class, which was supported by potentiostatic oscillations emerging once sufficient external resistance was included into the system as well as oscillating under galvanostatic conditions. Through a systematic exploration of experimental conditions, the electrochemical bromate oscillator also displayed complexity in the form of mixed-mode oscillations as well as complex bursting patterns.

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Electrochemical Oscillations (Named Oscillations H and K) during H₂O₂ Reduction on Pt Electrodes Induced by a Local pH Increase at the Electrode Surface

Cited by 4 publications

References 43 publications

Synchronization of two electrochemical oscillators in a closed bipolar cell

Synchronization of two electrochemical oscillators in a closed bipolar cell

Corrosion Potential Oscillation of Iron Electrodes in Nitric Acid

Complex Dynamic Behavior During the Electro-Reduction of Bromate Ions

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Electrochemical Oscillations (Named Oscillations H and K) during H2O2 Reduction on Pt Electrodes Induced by a Local pH Increase at the Electrode Surface

Cited by 4 publications

References 43 publications

Synchronization of two electrochemical oscillators in a closed bipolar cell

Synchronization of two electrochemical oscillators in a closed bipolar cell

Corrosion Potential Oscillation of Iron Electrodes in Nitric Acid

Complex Dynamic Behavior During the Electro-Reduction of Bromate Ions

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Electrochemical Oscillations (Named Oscillations H and K) during H₂O₂ Reduction on Pt Electrodes Induced by a Local pH Increase at the Electrode Surface