The effect of hydrophobic centres on the electrode surface on overvoltage in electrochemical gas evolution

Heidrich, H.-J.; Müller, Lothar

doi:10.1016/0013-4686(90)90047-4

Cited by 17 publications

(6 citation statements)

References 8 publications

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“…The first approach might be affected by electrodialysis or pervaporation of methanol using, for example, membranes, such as those that have been developed to diminish methanol crossover in direct methanol fuel cells . The third might be affected by decorating the surface of the anode with pendant, groups with sufficient lipophilicity to differentially repel water in the presence of methanol …”

Section: Discussionmentioning

confidence: 99%

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Anode-Boosted Electrolysis in Electrochemical Upgrading of Bio-oils and in the Production of H₂

et al. 2019

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Oxidizing an organic solute at the anode of an electrolysis cell can enhance the overall cell current, I, by supplementing the applied cell potential by an amount, E boost, the difference in potential required to achieve the observed rate in the presence and absence of the organic. We have found that, when the organic solute is methanol at concentrations, C, corresponding to a chemical oxygen demand of <25 g/L (in the range of that of wastewater or process water from hydrothermal liquefaction), then the effect of the anode-boosting becomes a strong function of the product of C and the cell current, I. Empirically, the boosting follows Hill–Langmuir kinetics, consistent with the cooperativity in the transport of the organic into the double layer of the anode or adsorption on the oxidation site.

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Section: Discussionmentioning

confidence: 99%

“…21 The third might be affected by decorating the surface of the anode with pendant, groups with sufficient lipophilicity to differentially repel water in the presence of methanol. 16 Figure 5. Estimate from eq 3 of the limiting current for the electrolysis of the dilute solutions of methanol.…”

Section: ■ Conclusionmentioning

confidence: 99%

Anode-Boosted Electrolysis in Electrochemical Upgrading of Bio-oils and in the Production of H₂

et al. 2019

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“…The effect of bubble behavior on activity can be explained by the bubble-collecting and bubble-blocking effects. PTFE particles act as hydrophobic centers which can collect oxygen bubbles from the active sites to the hydrophobic centers and then recover the activity of active sites [8,18,20]. The bubble-collecting process proceeds more easily on a more hydrophobic surface, i.e., the enhanced activity by bubble-collection is higher for a more hydrophobic electrode.…”

Section: Oxygen Evolution Reactionmentioning

confidence: 98%

“…PTFE acts as a hydrophobic center at the electrode surface and represents a bubble-collecting center. PTFE particles, hydrophobic centers, are capable of collecting bubbles easily from the active sites and then recovering the activity of active sites [8,13,19]. The PTFE content on the electrode is an important factor for determining site activity.…”

Section: Oxygen Evolution Reactionmentioning

confidence: 99%

“…A larger hydrophobic surface results in a better capability to concentrate hydrophobic substances on hydrophobic centers (14). For the sake of concentrating and removing effects, hydrophobic centers are frequently applied to the electrode surface (8,14,20). The contact angle of the PTFE-modified Ruo.3Tio.7O2 electrodes is listed in Table 1.…”

Section: Hydrophobicity Of the Electrodesmentioning

confidence: 99%

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Hydrophobic effect of PTFE‐modified Ru_0.3Ti_0.7O₂electrodes on oxygen evolution in alkaline solution

Shieh¹,

Hwang²

1998

Journal of the Chinese Institute of Engineers

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The hydrophobic effects of PTFE-modified Ru 0.3 Ti 0.7 O 2 electrodes on oxygen evolution are explored in this study by investigating contact angle, morphology and electrochemical characteristics. The hydrophobicity of electrodes is measured by the contact angle of the PTFE-modified Ru 0.3 Ti 0.7 O 2 electrodes. The morphologies of electrodes with various amounts of PTFE are observed by using a scanning electron microscope (SEM) and an atomic force microscope (AFM). The effects of PTFE-content on the electrochemical characteristics of PTFE-modified electrodes are evaluated by the measurements of voltammetric charge, polarization and ac-impedance. The behavior of oxygen evolution and the performance of electrodes depende significantly on the hydrophobicity of PTFE-modified electrodes. The electrode prepared from a dipping solution with 21.1 vol% PTFE have the best performance in terms of the largest number of active sites and the highest site activity. The variation in performance of electrodes for oxygen evolution with PTFE-content is related to the variation in active site dispersion, morphology and bubble behaviors of the electrode.

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Electrocatalysis of Hydrogen Evolution: Progress in Cathode Activation

Trasatti

1991

Advances in Electrochemical Sciences and Engineering

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The effect of hydrophobic centres on the electrode surface on overvoltage in electrochemical gas evolution

Cited by 17 publications

References 8 publications

Anode-Boosted Electrolysis in Electrochemical Upgrading of Bio-oils and in the Production of H₂

Anode-Boosted Electrolysis in Electrochemical Upgrading of Bio-oils and in the Production of H₂

Hydrophobic effect of PTFE‐modified Ru_0.3Ti_0.7O₂electrodes on oxygen evolution in alkaline solution

Electrocatalysis of Hydrogen Evolution: Progress in Cathode Activation

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The effect of hydrophobic centres on the electrode surface on overvoltage in electrochemical gas evolution

Cited by 17 publications

References 8 publications

Anode-Boosted Electrolysis in Electrochemical Upgrading of Bio-oils and in the Production of H2

Anode-Boosted Electrolysis in Electrochemical Upgrading of Bio-oils and in the Production of H2

Hydrophobic effect of PTFE‐modified Ru0.3Ti0.7O2electrodes on oxygen evolution in alkaline solution

Electrocatalysis of Hydrogen Evolution: Progress in Cathode Activation

Contact Info

Product

Resources

About

Anode-Boosted Electrolysis in Electrochemical Upgrading of Bio-oils and in the Production of H₂

Anode-Boosted Electrolysis in Electrochemical Upgrading of Bio-oils and in the Production of H₂

Hydrophobic effect of PTFE‐modified Ru_0.3Ti_0.7O₂electrodes on oxygen evolution in alkaline solution