Hydrogen evolution reaction on polycrystalline Au inverted rotating disc electrode in HClO4 and NaOH solutions

Meethal, Ranjith Punathil; Saibi, R; Ramanathan, Surash

doi:10.1016/j.ijhydene.2022.02.177

Cited by 6 publications

(10 citation statements)

References 57 publications

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“…The average values of the forward and backward standard rate constants for Reactions (1) and (2) ( k 0 1 , k 0 −1 and k 0 2 , k 0 −2 in the 0.5 M H 2 SO 4 solution are of the order of 10 −7 cm•s −1 and 10 −11 mol•cm −2 •s −1 , and 10 −6 cm•s −1 and 10 −6 cm•s −1 , and ( k 0 1 , k 0 −1 and k 0 2 , k 0 −2 in the 1.0 M H 2 SO 4 solution are of the order of 10 −7 cm•s −1 and 10 −12 mol•cm −2 •s −1 , and 10 −6 cm•s −1 and 10 −6 cm•s −1 , respectively. The estimated rate constants for the VHT steps exhibit a similar range of magnitude to the values reported in Meethal's study for the HER on gold in the HClO 4 solution [35]. Furthermore, as expected, the forward and backward standard rate constants values for Reaction 3 in both solutions remain relatively unaffected by changes in potential.…”

Section: Model Optimization On the Eis Datasupporting

confidence: 82%

“…The gold working electrodes were cleaned chemically in dilute aqua regia (0.5 M HNO 3 , 1.5 M HCl) for 7 min, and then electrochemically by cycling the potential between 0.5 and 2.0 V (versus SHE) in deaerated H 2 SO 4 (0.5 or 1.0 M) solutions (having measured pH values of 0.6 and 0.25) seven times at a scan rate of 100 mV/s. A commonly employed method to activate the gold surface is by cleaning via cyclic voltammetry, which involves repeatedly scanning the potential from the double-layer region to the oxide-formation region [35]. Such a method is also useful for detecting the presence of reducible cations (e.g., Ag + from the Ag/AgNO 3 reference electrode, in our case) but no such peaks were found.…”

Section: Electrochemical Measurementsmentioning

confidence: 93%

“…This enhancement was assigned to the formation of "stepped-like" structures, which were generated by consecutive electrochemical cycling within the double-layer region. In another study, Meethal et al [35] utilized an inverted rotating disc electrode to mechanistically model the kinetics of HER on a gold electrode in perchloric acid and in sodium hydroxide solutions. Their findings indicated that the Volmer-Heyrovsky-Tafel (VHT) mechanism best described the kinetics of the HER in highly acidic solutions.…”

Section: Introductionmentioning

confidence: 99%

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Mechanistic Analysis of Hydrogen Evolution Reaction on Stationary Polycrystalline Gold Electrodes in H2SO4 Solutions

Ghelichkhah,

Macdonald,

Ferguson

2024

CMD

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An impedance model based on the Volmer–Heyrovsky–Tafel mechanism was developed to study the kinetics of the hydrogen evolution reaction on polycrystalline gold electrodes at moderate overpotentials in aqueous H2SO4 (0.5 and 1.0 M) solutions. The model was optimized on data from potentiodynamic polarization and electrochemical impedance spectroscopy, and model parameters were extracted. Consistent with expectations, the magnitude of the impedance data indicated a higher rate of hydrogen evolution at lower pH. Also, the fractional surface coverage of adsorbed hydrogen (θHads) increases with increasing overpotential but the small value of θHads indicates only weak adsorption of H on gold. Tafel slopes and exchange current densities were estimated to be in the range of 81–124 mV/dec, and 10−6 and 10−5 A/cm2 in H2SO4 (0.5 and 1.0 M), respectively. The results show that the model accounts well for the experimental data, such as the steady-state current density. Sensitivity analysis reveals that the electrochemical parameters (α1, α2, k10, k−10, and k20) associated with the kinetics of the hydrogen evolution reaction have a major impact on the calculated impedance but the standard rate constant for hydrogen oxidation reaction (k−20) does not strongly affect the calculated impedance.

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Section: Model Optimization On the Eis Datasupporting

confidence: 82%

Section: Electrochemical Measurementsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mechanistic Analysis of Hydrogen Evolution Reaction on Stationary Polycrystalline Gold Electrodes in H2SO4 Solutions

Ghelichkhah,

Macdonald,

Ferguson

2024

CMD

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“…It is generally not advisible to use RDE measurements for assessing activities at large current densities (>200 mA cm –2 ) owing to the severe mass transport limitations. Instead, in recent years other innovative architectures such as inverted RDE, − microelectrodes, , floating electrodes and gas diffusion electrodes have been proposed to bridge the gap between RDE and MEA …”

Section: Assessing Catalyst Performance: Benchmarking and Best Practicesmentioning

confidence: 99%

Precious Metal Free Hydrogen Evolution Catalyst Design and Application

Feidenhans’l,

Regmi,

Wei

et al. 2024

Chem. Rev.

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The quest to identify precious metal free hydrogen evolution reaction catalysts has received unprecedented attention in the past decade. In this Review, we focus our attention to recent developments in precious metal free hydrogen evolution reactions in acidic and alkaline electrolyte owing to their relevance to commercial and near-commercial low-temperature electrolyzers. We provide a detailed review and critical analysis of catalyst activity and stability performance measurements and metrics commonly deployed in the literature, as well as review best practices for experimental measurements (both in half-cell three-electrode configurations and in two-electrode device testing). In particular, we discuss the transition from laboratory-scale hydrogen evolution reaction (HER) catalyst measurements to those in single cells, which is a critical aspect crucial for scaling up from laboratory to industrial settings but often overlooked. Furthermore, we review the numerous catalyst design strategies deployed across the precious metal free HER literature. Subsequently, we showcase some of the most commonly investigated families of precious metal free HER catalysts; molybdenum disulfide-based, transition metal phosphides, and transition metal carbides for acidic electrolyte; nickel molybdenum and transition metal phosphides for alkaline. This includes a comprehensive analysis comparing the HER activity between several families of materials highlighting the recent stagnation with regards to enhancing the intrinsic activity of precious metal free hydrogen evolution reaction catalysts. Finally, we summarize future directions and provide recommendations for the field in this area of electrocatalysis.

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“…14,15 Moreover, it is an inevitable element in industrial applications, including oil and metal refining ammonia productions, making hydrogen production and storage an exhilarating research topic of the new era. 16,17 In this context, research into the feasibility of employing borophene as a practical electrocatalyst is of significant importance and continues to progress, which is particularly due to the unique characteristics of boron, such as being the lightest Dirac material with pronounced anisotropy and massless Dirac fermions. 18 Theoretical investigations suggest that borophene holds great promise as an electrocatalyst for HER, thanks to its additional degrees of freedom in electronic transport.…”

Section: ■ Introductionmentioning

confidence: 99%

Surfactant-Assisted Restructuring of Boron to Borophene: Implications for Enhanced Hydrogen Evolution

Radhakrishnan,

Padmanabhan,

Mathews

et al. 2024

ACS Appl. Nano Mater.

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Borophene 2D nanosheets of boron and the evolving group III trans-graphene are a potential material for a plethora of applications; however, they have not been well explored due to the ambiguity in their electronic configuration and consequent polymorphism. Here, we introduced liquid-phase treatments utilizing surfactants exfoliating boron to 2D borophene. Poly(ethelyene glycol) (PEG) polymeric chains with neutral characteristics simultaneously with surfactants of cationic and anionic characteristics, respectively, as cetyltrimethylammonium bromide (CTAB) and sodium dodecyl sulfate (SDS) were utilized to constructively engineer a β rhombohedral crystal structure in borophene layers. These engineered borophene layers, on further analyzing their electrochemical performance by hydrogen evolution reactions, showed a heightened efficacy for borophene sheets synthesized in the presence of PEG, characterized by a Tafel slope of 178 mV/dec in a 0.5 M H2SO4 solution. This enhanced performance was intricately linked to the elevated quality of the borophene sheets during PEG-assisted liquid-phase treatment and to the increased accessibility of active sites characterized by the β rhombohedral crystal lattices engineered by PEG polymeric chains.

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Hydrogen evolution reaction on polycrystalline Au inverted rotating disc electrode in HClO4 and NaOH solutions

Cited by 6 publications

References 57 publications

Mechanistic Analysis of Hydrogen Evolution Reaction on Stationary Polycrystalline Gold Electrodes in H2SO4 Solutions

Mechanistic Analysis of Hydrogen Evolution Reaction on Stationary Polycrystalline Gold Electrodes in H2SO4 Solutions

Precious Metal Free Hydrogen Evolution Catalyst Design and Application

Surfactant-Assisted Restructuring of Boron to Borophene: Implications for Enhanced Hydrogen Evolution

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