Study of the hydrogen evolution reaction on nickel-based composite coatings containing molybdenum powder

Kubisztal, Julian; Budniok, A.; Lasia, Andrzej

doi:10.1016/j.ijhydene.2006.11.020

Cited by 213 publications

(110 citation statements)

References 16 publications

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“…where U represents a factor of homogeneity [32]. In the case of smooth nickel electrode, the capacitance parameter T dl is also related to the average double layer capacitance C dl by a slightly different relation [32]:…”

Section: Electrochemical Impedance Spectroscopy Resultsmentioning

confidence: 99%

“…12). It consists of the solution resistance, R s , in series with two parallel CPE-R elements (2-CPE model) [31,32]. According to this model, the high-frequency time constant, independent of the potential, described by the R p and CPE p connected in parallel, is related to the electrode porosity, whereas the potential-dependent time constant is related to the kinetics of the electro-oxidation of methanol (R ct and CPE dl connected in parallel).…”

Section: Cyclic Voltammetrymentioning

confidence: 99%

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Preparation, characterization, and application of alkaline leached Ni/Zn–Ni binary coatings for electro-oxidation of methanol in alkaline solution

2012

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The Ni-Zn binary coating was electrochemically deposited on a copper electrode. Then, it was etched in a concentrated alkaline solution (30 wt% NaOH) to obtain a porous electrocatalytic surface suitable for methanol electro-oxidation in alkaline solution. The surface compositions of coatings before and after alkaline leaching were determined by atomic absorption spectroscopy and energy dispersive X-ray analysis. The surface morphologies were investigated by scanning electron microscopy. It was found that the leached Ni-Zn coating has a porous structure. Electrocatalytic activity toward the methanol electro-oxidation was assessed by cyclic voltammetry and electrochemical impedance spectroscopy techniques. The activation of electrode related to the removal of existing corrosion products and formation of pores and cracks during alkaline leaching. Cyclic voltammetry studies confirmed that the alkaline leaching process improved the activity of Ni-Zn coating in comparison with smooth Ni deposit for the methanol electro-oxidation.

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Section: Electrochemical Impedance Spectroscopy Resultsmentioning

confidence: 99%

Section: Cyclic Voltammetrymentioning

confidence: 99%

Preparation, characterization, and application of alkaline leached Ni/Zn–Ni binary coatings for electro-oxidation of methanol in alkaline solution

2012

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“…The time constant associated to this semicircle, s 2 (CPE 2 À R 2 ), changes with overpotential. The HF semicircles is associated to the porosity of the electrode surface, [62][63][64][65] and the time constant related to this semicircles, s 1 (CPE 1 À R 1 ), does not signicantly change with the cathodic overpotential. According to the discussion presented above, the suitability of a specic electric equivalent circuit (EEC) to model the experimental data can be considered as a criterion to prescribe parameters to the specic processes (i.e.…”

Section: Electrochemical Impedance Spectroscopy Measurementsmentioning

confidence: 99%

“…Considering Table 3 The fitted parameters values of the equivalent for hydrogen evolution reaction on different temperature and different potential a value of 20 mF cm À2 for the double layer capacitance, C dl , of a smooth nickel surface area, in term of surface roughness factor (R f ), may be estimated by comparing the C dl related to the HER charge-transfer kinetics of porous/rough and smooth electrodes. 72,73 The plots of the electrode surface roughness factors as function of the HER overpotential are displayed in Table 4.…”

Section: Electrochemical Impedance Spectroscopy Measurementsmentioning

confidence: 99%

Electrocatalytic activity of porous Ni–Fe–Mo–C–LaNi₅ sintered electrodes for hydrogen evolution reaction in alkaline solution

Guo

Yang

et al. 2017

RSC Adv.

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The hydrogen evolution reaction (HER) was studied in 6 M KOH solution at temperatures ranging between 303 K and 353 K on a porous Ni-Fe-Mo-C-LaNi 5 electrode. By using steady-state polarization curves and electrochemical impedance spectroscopy (EIS), the surface roughness factor and the intrinsic activities of the porous Ni-Fe-Mo-C-LaNi 5 electrode have been determined. The Tafel slope of the best-performing porous Ni-Fe-Mo-C-LaNi 5 cathode materials is 140 mV dec À1, and the exchange current density is 9.9 Â 10À4 A cm À2 at elevated temperature. The roughness factor is 8600, which was obtained for the HER on studied electrodes in 6 M KOH solution at 323 K temperature using the EIS data and complex nonlinear least square (CNLS) approximation method. These techniques also permitted us to determine the mechanism and kinetics of the HER on the investigated electrode. The overall experimental data indicates that the porous Ni-Fe-Mo-C-LaNi 5 electrode yields electrocatalytic activity in the HER.Nevertheless, when the effect of the surface roughness is taken into consideration, it is demonstrated that alloying Ni with Fe, Mo, C and LaNi 5 results in an increased electrocatalytic activity in the HER when comparing to pure Ni. This is due to an improved intrinsic activity of the material, which is explained on the basis of the synergism among the catalytic properties of Ni and of Fe, Mo, and induced by C embedded into Ni-Fe matrix and Ni-Fe-Mo matrix. LaNi 5 enhances the H adsorption on the electrode surface and mainly plays a role of hydrogen storage for HER.

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“…Among them, electrodeposited Ni-Co alloy was one of the most common used materials for HER [7] . In order to further enhance electrocatalytic activity of nickel alloys, metal powders or oxides with special function, such as Mo powder, TiO x , RuO 2 , TiO 2 -supported RuO 2 , LaNi 5 , IrO 2 Pr 2 O 3 and AB 5 [8][9][10][11][12][13][14][15][16] , etc., were frequently incorporated into the alloy layer by composite electrodeposition technology, and the formed composite coatings yielded higher electrocatalytic activity and stability resulted from larger real surface areas of the electrodes. Moreover, the electrochemical codeposition process of particles and metallic ions is beneficial to achieve the synergetic effect of both species for electrocatalytic performance [13] .…”

Section: Introductionmentioning

confidence: 99%

La₂O₃-Modified Nickel-Cobalt Composite Coating as Cathode Materials for Hydrogen Evolution Reaction

Liang

Chen

et al. 2010

ECS Trans.

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La 2 O 3 was successfully doped into nickel-cobalt alloy coating on Ti substrate by electrodeposition technology.The surface morphology and microstructure were examined by SEM and XRD, respectively, and the hydrogen evolution property was evaluated by electrochemical techniques, including steady-state polarization, Tafel plot and electrochemical impedance spectroscopy. It was found that the incorporated La 2 O 3 particles resulted in the improvement of roughness and surface area of the composite coating electrode, and hydrogen evolution potential of nickelcobalt-La 2 O 3 composite coating electrode moved positively around 178 mV at 15 mA cm -2 compared with that of nickel-cobalt alloy deposited coating electrode. It was assumed that the enhanced electrocatalytic activity to hydrogen evolution was attributed to the improved surface area and the decreased apparent activation energy, which was verified by hydrogen evolution kinetics parameters calculated from Tafel plots and electrochemical impedance spectroscopy.

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Study of the hydrogen evolution reaction on nickel-based composite coatings containing molybdenum powder

Cited by 213 publications

References 16 publications

Preparation, characterization, and application of alkaline leached Ni/Zn–Ni binary coatings for electro-oxidation of methanol in alkaline solution

Preparation, characterization, and application of alkaline leached Ni/Zn–Ni binary coatings for electro-oxidation of methanol in alkaline solution

Electrocatalytic activity of porous Ni–Fe–Mo–C–LaNi₅ sintered electrodes for hydrogen evolution reaction in alkaline solution

La₂O₃-Modified Nickel-Cobalt Composite Coating as Cathode Materials for Hydrogen Evolution Reaction

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Study of the hydrogen evolution reaction on nickel-based composite coatings containing molybdenum powder

Cited by 213 publications

References 16 publications

Preparation, characterization, and application of alkaline leached Ni/Zn–Ni binary coatings for electro-oxidation of methanol in alkaline solution

Preparation, characterization, and application of alkaline leached Ni/Zn–Ni binary coatings for electro-oxidation of methanol in alkaline solution

Electrocatalytic activity of porous Ni–Fe–Mo–C–LaNi5 sintered electrodes for hydrogen evolution reaction in alkaline solution

La2O3-Modified Nickel-Cobalt Composite Coating as Cathode Materials for Hydrogen Evolution Reaction

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Electrocatalytic activity of porous Ni–Fe–Mo–C–LaNi₅ sintered electrodes for hydrogen evolution reaction in alkaline solution

La₂O₃-Modified Nickel-Cobalt Composite Coating as Cathode Materials for Hydrogen Evolution Reaction