A study on the Co–W activated Ni electrodes for the hydrogen production from alkaline water electrolysis – Energy saving

Kaninski, Milica P. Marčeta; Miulovic, Snezana M.; Tasić, Gvozden S.; Maksić, Aleksandar D.; Nikolić, Vladimir M.

doi:10.1016/j.ijhydene.2011.02.046

Cited by 54 publications

(13 citation statements)

References 23 publications

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“…It includes different effects, with their specific contributions. One of them could be the electrocatalytic effect of either one individual metal (Co), or combination of two metals (CoeCr), deposited on the electrode surface (powder like deposition observed also in this work and our previous investigation [13]), providing at the same time very large surface area of active centres. However, the catalytic effects of ethylenediamine, or trimethylenediamine ligands, which are present in the electrolyte after decomposition of the corresponding complex and deposition of metals on the surface, has its own role in that mechanism.…”

Section: Resultssupporting

confidence: 59%

“…As a consequence, the active electrode surface becomes more developed. All of this usually leads to a lower overpotential, as it had shown in some of our previous works [13,15]. Further, hydrogen atoms are transported to the metal via an exchange with the electrolyte, and this will also have the effect of decreasing the activation energy and hence the overvoltage.…”

Section: Resultsmentioning

confidence: 67%

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Energy saving in electrolytic hydrogen production using Co–Cr activation – Part I

Miulovic

Maslovara

Seović

et al. 2012

International Journal of Hydrogen Energy

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Section: Resultssupporting

confidence: 59%

Section: Resultsmentioning

confidence: 67%

Energy saving in electrolytic hydrogen production using Co–Cr activation – Part I

Miulovic

Maslovara

Seović

et al. 2012

International Journal of Hydrogen Energy

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“…The ability of an electrode to catalyze the HER is usually measured by the exchange current density (ECD), which is the rate of hydrogen evolution per surface area at the electrode potential, where the reaction is at equilibrium. According to different authors the ECD for Ni-W and Co-W electrodes for the HER in alkaline solution varies in the range of 10 À5 -10 À2 Acm À2 [11] and fundamentally depends on corresponding alloy's chemical composition, morphology, structure and physicochemical properties. It was shown that the ECD rises with increasing W content in Ni-W [20] and Co-W [23] alloys and becomes maximal at 10 at.%.…”

Section: Introductionmentioning

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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“…The most straightforward method to achieve enhancement in catalytic activity is the combination of two metals from both parts of the volcano curve, which is considered to be state of the art in theoretical investigations in the field of electrocatalysis [17][18][19][20]. Most of the scientific literature in this field has focused on the creation of molybdenum and tungsten alloys with elements located on the left side of a volcano curve, like Co [21][22][23], Fe [24][25][26][27], and Ni [28][29][30], where the catalytic improvements were connected with an increase of the electroactive surface area and the formation of nanoor amorphous phases, demonstrating a synergetic effect [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of electrodeposited Ni-Ru alloys: morphological and catalytic study

Kutyła

Kołczyk-Siedlecka

Kwiecińska

et al. 2019

J Solid State Electrochem

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Nickel-ruthenium alloys with various compositions have been deposited by electrodeposition for the first time. Cyclic voltammetry and linear stripping voltammetry measurements show that codeposition of nickel with ruthenium is possible below the potential value of nickel reduction. High-quality alloys containing nickel and ruthenium can be plated at cathodic potentials ranging from − 0.5 to − 1.0 V vs SCE. Deposited coatings were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and atomic force microscopy (AFM). The diffractograms obtained show that an increase of nickel concentration in alloy will lead to a change in the phase composition and formation of NiRu (100) and (101) phases which is observed to be 78 mas.% Ni. SEM studies confirm the surface homogeneity and presence of small, regular grains. AFM observation allows the estimation of the real surface area of obtained alloys which increase with more negative electrodeposition potentials. Ni-Ru alloys were found to be highly electroactive in the water splitting process, which can be connected with the presence of the NiRu phase and a well-developed electroactive area.

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A study on the Co–W activated Ni electrodes for the hydrogen production from alkaline water electrolysis – Energy saving

Cited by 54 publications

References 23 publications

Energy saving in electrolytic hydrogen production using Co–Cr activation – Part I

Energy saving in electrolytic hydrogen production using Co–Cr activation – Part I

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

Preparation and characterization of electrodeposited Ni-Ru alloys: morphological and catalytic study

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