Assessment of the roughness factor effect and the intrinsic catalytic activity for hydrogen evolution reaction on Ni-based electrodeposits

Herrãiz‐Cardona, Isaac; Ortega, E.; Garcı́a-Antón, J.; Pérez-Herranz, V.

doi:10.1016/j.ijhydene.2011.05.047

Cited by 163 publications

(69 citation statements)

References 56 publications

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“…This setup was described in detail by Herraiz-Cardona and co-workers [53][54]. The experiments were done using an electrochemical cell patented by the Dpto.…”

Section: Experimental Workmentioning

confidence: 99%

“…All the spectra consist in a displaced depressed capacitive semicircle, formed by two overlapping semi-circles, one for high frequencies and the other one for intermediate frequencies [52]. The physical explanation of these spectra was widely described by Herraiz-Cardona et al [51,[52][53][54]. The intermediate frequency semi-circle is related to the Hydrogen Evolution Reaction (HER) kinetics; while the high frequency semi-circle is related to the porosity of the electrode surface.…”

Section: Experimental Workmentioning

confidence: 99%

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Total harmonic distortion based method for linearity assessment in electrochemical systems in the context of EIS

Giner-Sanz

Ortega

Pérez-Herranz

2015

Electrochimica Acta

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ElsevierGiner Sanz, JJ.; Ortega Navarro, EM.; Pérez-Herranz, V. (2015). Total harmonic distortion based method for linearity assessment in electrochemical systems in the context of EIS. Electrochimica Acta. 186:598-612. doi:10.1016Acta. 186:598-612. doi:10. /j.electacta.2015 Electrochemical Impedance Spectroscopy (EIS) is a widely used electrochemical measurement technique that has been used in a great spectrum of fields since it allows deconvolving the individual physic-chemical processes that take place in a given system. Ohm's generalized law, and thus the impedance concept, are only valid if 4 conditions are fulfilled: causality, finiteness, stationarity and linearity. In the case that any of these conditions is not achieved, the obtained impedance spectra will present distortions that may lead to biased or even erroneous results and conclusions. For this reason it is crucial to verify if the 4 conditions are fulfilled, before accepting the results extracted from impedance spectra. In this work, a linearity assessment quantitative method based in the total harmonic distortion (THD) parameter is presented and verified experimentally. The experimental validation of the implemented method showed that the implemented method is able to assess quantitatively the linearity of the system. In addition, it is also able to determine the threshold frequency above which the system will not present significant nonlinear effects even for large perturbation amplitudes. It was observed that the THD method is more sensitive to nonlinear effects than the spectra themselves.

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“…This setup was described in detail by Herraiz-Cardona and co-workers [53][54]. The experiments were done using an electrochemical cell patented by the Dpto.…”

Section: Experimental Workmentioning

confidence: 99%

Section: Experimental Workmentioning

confidence: 99%

Total harmonic distortion based method for linearity assessment in electrochemical systems in the context of EIS

Giner-Sanz

Ortega

Pérez-Herranz

2015

Electrochimica Acta

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“…The j 0 is a representative of the rate of the HER [57]. The increased activity could be originated either from increase in the C dl (surface roughness effect), or intrinsic activity (synergistic effect), or both.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Sulfur-doped graphene as a catalyst support: Influences of carbon black and ruthenium nanoparticles on the hydrogen evolution reaction performance

Shervedani

Amini

2015

Carbon

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“…As the current pulse of +300 mA/cm 2 was applied, a sharp increase in the potential was observed until a potential at which OH À is oxidized to O 2 is reached. In other words, an equilibrium state is reached between newly forming bubble and bubbles escaping from the surface of the electrode ( Ref 18,24). The inset in Fig.…”

Section: Chronopotentiometrymentioning

confidence: 98%

Electrolytic Synthesis and Characterization of Electrocatalytic Ni-W Alloy

Elias

Scott

Hegde

2015

J. of Materi Eng and Perform

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Inspired by the more positive (about 0.38 V nobler) discharge potential of hydrogen on Ni-W alloy compared to that on both Ni and W, a Ni-W alloy has been developed electrolytically as an efficient electrode material for water electrolysis. The deposition conditions, for peak performance of the electrodeposits for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1.0 M KOH medium have been optimized. Electrocatalytic activity of the coatings, deposited at different current densities (c.d.Õs) for water splitting reactions of HER and OER was tested by cyclic voltammetry and chronopotentiometry. It was found that Ni-W alloys deposited, at 4.0 A/dm 2 (having about 12.49 wt.% W) and 1.0 A/dm 2 (having about 0.95 wt.% W) are good electrode materials as cathode (for HER) and anode (for OER), respectively. A dependency of the electrocatalytic activity for HER and OER with relative amount of Ni and W, in the deposit was found. The variation of electrocatalytic activity with W content showed the existence of a synergism between high-catalytic property of W (due to low hydrogen overvoltage) and Ni (having increased adsorption of OH 2 ions), for hydrogen (as cathode) and oxygen (as anode) evolution, respectively. Electrocatalytic activities of the coatings, developed at different c.d.Õs were explained in the light of their phase structure, surface morphology, and chemical composition, confirmed by XRD, FESEM, and EDX analysis. The effect of c.d. on thickness, hardness, composition, HER, and OER was analyzed, and results were discussed with possible mechanisms.

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Assessment of the roughness factor effect and the intrinsic catalytic activity for hydrogen evolution reaction on Ni-based electrodeposits

Cited by 163 publications

References 56 publications

Total harmonic distortion based method for linearity assessment in electrochemical systems in the context of EIS

Total harmonic distortion based method for linearity assessment in electrochemical systems in the context of EIS

Sulfur-doped graphene as a catalyst support: Influences of carbon black and ruthenium nanoparticles on the hydrogen evolution reaction performance

Electrolytic Synthesis and Characterization of Electrocatalytic Ni-W Alloy

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