Influence of electrodeposition parameters of Ni–W on Ni cathode for alkaline water electrolyser

Tasić, Gvozden S.; Lačnjevac, U.Č.; Tasić, Marijana M.; Kaninski, Milica Marčeta; Nikolić, Vladimir M.; Žugić, Dragana L.; Jović, V.D.

doi:10.1016/j.ijhydene.2013.01.193

Cited by 51 publications

(16 citation statements)

References 14 publications

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“…Such layer has electrocatalytic properties which are worse by 100 mV in comparison to the rough layer ± blue dashed curve on Figure 4. This is in a good agreement with the work from Tasic et al [29], where they show the better properties of the NiW layer with high surface roughness.…”

Section: Resultssupporting

confidence: 93%

“…A synergetic activation effect can also be excluded, because if we take the polarization curve ( Figure 6, black curve) from example with the same composition, but with smooth surface (Figure 5a) the result would be another ± there would be almost no difference between the potentials from NiTiO x and NiWTiO x . As already proposed in the literature [14,29] a well-developed surface, in our case the cauliflower NiWTiO x structure, can accelerate the hydrogen evolution by 100 mV. New alloy with different composition (CoMn) and higher surface roughness enhances the cathodic properties in comparison with the pure NiG by a total of 500 mV.…”

Section: Resultssupporting

confidence: 73%

See 1 more Smart Citation

New Cathode Materials for the Anion Exchange Membrane Electrolyzer (AEM)

Manolova¹,

Schoeberl²,

Bretzler³

et al. 2014

Fuel Cells

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An anion exchange membrane electrolyzer (AEM) should combine the positive qualities of the Alkaline Water Electrolysis and the proton exchange membrane (PEM) Electrolysis – compactness, environmentally friendly, effectively and being economically priced. Here, we present improvements of the used substrate materials and of the deposited coatings for developing an AEM with such characteristics. Ni‐wire mesh, stainless steel non‐woven fabrics and stainless steel web were tested as cathode substrate. Base alloys of NiWTiOx, CoNiMoW, CoMn, porous Ni, and porous Ni with TiOx were potentiostatically and galvanostatically deposited. The effect of a single substrate and electrolyte component is graphically shown. We established that, the rougher the structure of an alloy is, the better the electrochemical properties are. The cathode separators were analyzed through EDS‐analysis, light microscopy and REM‐investigations. The electrochemical characterizing was performed galvanostatically in 1 M KOH. The combination substrate‐alloy, which shows the very best electrochemical properties, will be tested in real conditions.

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Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 73%

New Cathode Materials for the Anion Exchange Membrane Electrolyzer (AEM)

Manolova¹,

Schoeberl²,

Bretzler³

et al. 2014

Fuel Cells

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show abstract

“…catalysts for the HER [23,31,68,69]. It is widely accepted that the HER kinetics in alkaline medium involves the electron-coupled water dissociation (the Volmer step for the formation of adsorbed hydrogen) and the combination of adsorbed hydrogen into molecular hydrogen via either the interaction of the H atom and water molecule (Heyrovsky step), or the combination of two H atoms (Tafel step) [70].…”

Section: Electrocatalytic Hydrogen Evolution On Ni-w Co-w and Fe-w Cmentioning

confidence: 99%

Electrodeposited tungsten-rich Ni-W, Co-W and Fe-W cathodes for efficient hydrogen evolution in alkaline medium

Vernickaite

Цынцару

Sobczak

et al. 2019

Electrochimica Acta

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The search of active, stable and cost-effective non-noble electrocatalysts for hydrogen evolution reaction (HER) is essential for sustainable energy systems. In this study, the electrodeposited Ni-W, CoW and FeW coatings having 5e30 at.% of W were examined as an alternative electrocatalysts for hydrogen evolution. The electrocatalytic efficiency of the electrodes was investigated on the basis of electrochemical data obtained from steady-state polarization technique in 30 wt% NaOH solution. It was found that with increasing of tungsten content in the deposits up to ~30 at.% a crystal-to-ultra-nanocrystalline transition takes place and the crystal grain size decreases up to 2e4 nm. The high content of W leads to course-grained coatings. These morphological and structural changes showed remarkable impact on the catalytic activity. The maximum catalytic performance was obtained for ultra-nanocrystalline W coatings. Among them the Ni-29at.%W demonstrated the highest apparent exchange current density (ECD) at the room temperature, i.e. 0.55 mA cm À2 , thus indicating more favorable hydrogen reduction. A significant improvement of catalytic activity of all tested cathodes with increasing the temperature of NaOH solution was noticed. Among investigated Co-33at.%W, Fe-30at.%W and Ni-29at.%W cathodes, the last one showed the best performance towards HER (ECD ¼ 14.5 mA cm À2 at 65 C).

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“…In each plot corresponding to different i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y x x x ( 2 0 1 5 ) 1 e1 0 coatings, it may be seen that the first step is an electroreduction of the water molecule, with the formation of hydrogen adsorbed on the electrode surface (Volmer reaction), followed by an electrochemical (Heyrovsky reaction), and/or chemical (Tafel reaction) desorption of H 2 . Analysis of the HER mechanism for FeeNi and FeeNi-G composite coatings have been made based on the Tafel slope (b c ) values [62]. For this analysis, the values of Tafel slope given in the work of Choquette et al for different HER mechanisms were taken as the reference (up to 66 mV dec À1 indicate HeyrovskyeVolmer mechanism; neighbourhood of 118 mV dec À1 indicate VolmereTafel mechanism and above 200 mV dec À1 indicate Tafel mechanism) [63].…”

Section: Hydrogen Evolution Reactionmentioning

confidence: 99%

“…Conventional industrial low-pressure alkaline electrolyzers operate usually at current densities from À100 mA cm À2 to À300 mA cm À2 . The simplest way to estimate the electrocatalytic activity under these conditions is to monitor the electrode potential at constant current density applied over sufficient period of time by chronopotentiometry experiment [62]. The chrono-potentiometry study for evolution of hydrogen on FeeNi-G composite coatings, deposited at different current densities were made at a constant current density of 300 mA cm À2 for a duration of 1500 s. The electrocatalytic behaviour of each coating was evaluated by measuring the amount of H 2 liberated in first 300 s. The nature of chrono-potentiogram for FeeNi alloy and FeeNi-G composite coating deposited at 60 mA cm À2 is shown in Fig.…”

Section: Hydrogen Evolution Reactionmentioning

confidence: 99%