pH effect on oxidation of hydrogen peroxide on Au(111) electrode in alkaline solutions

Li, Jiaojiao; Wei, Jie; Cai, Jun; Chen, Yan‐Xia

doi:10.1063/1674-0068/31/cjcp1804064

Cited by 6 publications

(2 citation statements)

References 13 publications

(29 reference statements)

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“…This indicates that at such low potentials when H ad exists on the Pt surface either these processes are outer-sphere reactions that does not necessary need active sites or their kinetics are very fast to provide huge current with the help of only a few active sites. However, further reduction of H 2 O 2 and the breaking of the O–O bond are sensitive to interfacial properties such as adsorption, pH, and surface charge. ,,− Systematic studies of the coverage in HER region is of great help for better understanding. − …”

Section: Resultsmentioning

confidence: 99%

Unraveling Complex Electrode Processes by Differential Electrochemical Mass Spectrometry and the Rotating Ring-Disk Electrode Technique

et al. 2019

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The competition between the oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) on a polycrystalline Pt (pc-Pt) electrode in weakly acidic solutions (pH ≈ 3) under the condition when both reactions are thermodynamically allowed is investigated using the rotating ring disk electrode (RRDE) technique and differential electrochemical mass spectrometry (DEMS). The partial currents of HER and ORR producing H 2 O 2 or H 2 O are quantified. The results show that (i) ORR occurs preferentially in a diffusion-limited manner (either limited by the mass transfer of O 2 or H + ) and only the excess H + not being consumed by the ORR can be converted to H ad and H 2 and (ii) at potentials negative of the onset of H ad formation, the H 2 O 2 production rate first increases and then decreases with the increasing overpotential. Possible origins for the H 2 O 2 yield in the HER region are suggested. Present results demonstrate that combining DEMS and RRDE techniques can be powerful for deriving the intrinsic kinetics of individual processes in a complex electrochemical system.

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Section: Resultsmentioning

confidence: 99%

Unraveling Complex Electrode Processes by Differential Electrochemical Mass Spectrometry and the Rotating Ring-Disk Electrode Technique

et al. 2019

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“…The kinetics of many electrocatalytic reactions, such as the hydrogen evolution/oxidation reaction, − oxygen reduction, − reduction and oxidation of H 2 O 2 , , oxidation of small organic molecules, − CO 2 reduction, and so on, are found to change abruptly with the solution pH. Variation in the solution pH will change the electrochemical potential of protons and the thermodynamic equilibrium potential of the related reactions.…”

Section: Introductionmentioning

confidence: 99%

Effect of pH on Sulfate Adsorption on the Pd(111) Electrode

et al. 2022

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Whether SO4 2– or HSO4 – is the dominating adsorbate on the Pd(111) electrode, and what is(are) the driving force responsible for its(their) formation are fundamental issues in interfacial electrochemistry that remain unsolved. In this work, the effect of pH on (bi)sulfate adsorption on Pd(111) in electrolytic solutions of pH values from 0 to 13 is systematically studied by cyclic voltammetry. The onset potential for (bi)sulfate adsorption is ca. 0.23 V vs the reversible hydrogen electrode (RHE) in solution at pH = 1. When the solution pH increases from 0 to 3, the peak potential of sulfate adsorption shifts positively with a slope of ca. 20–40 mV/pH. In alkaline solutions at pH > 10, sulfate adsorption takes place at E > 0.55 VRHE, falling into the potential region where OHad occurs. After carefully analyzing the related onset/peak potential of (bi)sulfate desorption/adsorption to the thermodynamic equilibrium potential of possible electrode reactions and the corresponding Faradic charge due to adsorption, we propose that the adsorbate on Pd(111) is most probably SO4*, no matter whether the main precursor for its adsorption is HSO4 – or SO4 2– in the bulk solution. This is supported by the pH- and composition-dependent change of the electrochemical potential of related processes and the fact that only a single band for S-containing adsorbate is detected by infrared spectroscopy. The fact that the onset potential for sulfate adsorption is negative compared to the potential of zero charge of Pd(111) suggests that pH-modulated electrochemical potential of the reactants, rather than the pH-dependent surface charging behavior, is the dominant factor of the observed pH effect on sulfate adsorption on Pd(111).

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Low‐Voltage Hydrogen Production via Hydrogen Peroxide Oxidation Facilitated by Oxo Ligand Axially Coordinated to Cobalt in Phthalocyanine Moiety

Lee

et al. 2023

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A cobalt phthalocyanine having an electron‐poor CoN4 (+δ) in its phthalocyanine moiety was presented as an electrocatalyst for hydrogen peroxide oxidation reaction (HPOR). We suggested that hydrogen peroxide as an electrolysis medium for hydrogen production and therefore as a hydrogen carrier, demonstrating that the electrocatalyst guaranteed high hydrogen production rate by hydrogen peroxide splitting. The electron deficiency of cobalt allows CoN4 to have the highly HPOR‐active monovalent oxidation state and facilitates HPOR at small overpotentials range around the onset potential. The strong interaction between the electron‐deficient cobalt and oxygen of peroxide adsorbates in Co─OOH− encourages an axially coordinated cobalt oxo complex (O═CoN4) to form, the O═CoN4 facilitating the HPOR efficiently at high overpotentials. Low‐voltage oxygen evolution reaction guaranteeing low‐voltage hydrogen production is successfully demonstrated in the presence of the metal–oxo complex having electron‐deficient CoN4. Hydrogen production by 391 mA cm−2 at 1 V and 870 mA cm−2 at 1.5 V is obtained. Also, the techno‐economic benefit of hydrogen peroxide as a hydrogen carrier is evaluated by comparing hydrogen peroxide with other hydrogen carriers such as ammonia and liquid organic hydrogen carriers.

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pH effect on oxidation of hydrogen peroxide on Au(111) electrode in alkaline solutions

Cited by 6 publications

References 13 publications

Unraveling Complex Electrode Processes by Differential Electrochemical Mass Spectrometry and the Rotating Ring-Disk Electrode Technique

Unraveling Complex Electrode Processes by Differential Electrochemical Mass Spectrometry and the Rotating Ring-Disk Electrode Technique

Effect of pH on Sulfate Adsorption on the Pd(111) Electrode

Low‐Voltage Hydrogen Production via Hydrogen Peroxide Oxidation Facilitated by Oxo Ligand Axially Coordinated to Cobalt in Phthalocyanine Moiety

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