Electrodeposited Co-Mo-C Cathodes for Hydrogen Evolution in a Hot Concentrated NaOH Solution

Żabiński, Piotr; Nemoto, Hitoshi; Meguro, Shinsaku; Asami, K.; Hashimoto, Kôji

doi:10.1149/1.1604788

Cited by 33 publications

(20 citation statements)

References 20 publications

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“…It means transfer of the charge from carbon to metal in alloy and causes a faster transfer of the charge from metal to the hydrogen atom and thus acceleration of the hydrogen evolution process on such an alloy. This phenomenon also takes place in the case of alloys Ni-Mo-C, Co-W-C, and Ni-Fe-C [21][22][23][24]. Combining nickel, molybdenum or cobalt, and non-metals into semiconducting compounds Ni-S [25], CoSe [26], Mo-Se [26,27], and Mo-S [28] has been intensely investigated recently.…”

Section: Introductionmentioning

confidence: 98%

Electrodeposition of Electroactive Co–B and Co–B–C Alloys for Water Splitting Process in 8 M NaOH Solutions

et al. 2017

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The aim of this work was to determine parameters of obtaining Co-B and Co-B-C alloys characterized by low overpotential in hydrogen evolution reactions. There were tests performed to examine the influence of borax and arginine concentration changes as well as the value of cathodic current intensity on the composition, morphology, synthesis current efficiency, and effectiveness of hydrogen evolution. Carbon was added to Co-B alloys to improve its properties of water decomposition in 8 M NaOH solution at 90°C. The results of the experiments confirmed a decrease in overpotential values from 48 mV/dec for Co-8.5B alloy to 33 mV/dec for Co-8.2B-9.6C alloy obtained at the highest concentration (0.1 M) of arginine in the electrolyte. It was observed that alloys of good catalytic properties featured an amorphous structure. The coatings were analyzed with the use of a scanning electron microscope (SEM) and X-ray diffraction (XRD). The content of boron was assessed based on the glow discharge spectroscopy (GDS) method, whereas carbon was analyzed with the method of adsorption spectroscopy of infrared radiation.

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Section: Introductionmentioning

confidence: 98%

Electrodeposition of Electroactive Co–B and Co–B–C Alloys for Water Splitting Process in 8 M NaOH Solutions

et al. 2017

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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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“…Molybdenum alloys are utilized in variety of applications. They serve as electrodes in the process of the hydrogen evolution reaction (12)(13)(14), catalysts for hydroprocessing of aromatic oils and gas phase hydrogenation of benzene as well (15). This electrocatalytic activity is due to the low overvoltage of hydrogen on Mo and Ni (16).…”

Section: Introductionmentioning

confidence: 99%

Electrochemically Deposition of High Mo Content Amorphous/Nanocrystalline Ni-Mo Using Ionic Liquids as Additive

Roozbehani¹,

Ashrafi²,

Shadizadeh³

et al. 2012

ECS Trans.

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Ni-Mo alloy coatings containing more than 49 wt.% Mo have been electrodeposited onto mild steel from ammonia-citrate solution in the presence of two kind of imidazolium-based ionic liquids as additive.Pulse plating technique was employed for electrodeposition. The structural components of the coatings were evaluated employing X-ray diffraction method (XRD). Microstructure, morphology and chemical composition of the coatings were investigated using scanning electron microscopy (SEM) and X-ray energy-dispersive spectroscopy (EDX) analysis. SEM micrographs revealed different morphology of Ni-Mo electrodeposits in the presence of ionic liquids. Also XRD patterns illustrated that present conditions lead to deposit Ni-Mo coatings with amorphous/nanocrystalline structure. The results showed that, within the range of 30-35 wt.% Mo nanocrystalline Ni-Mo with the lowest grains size have been developed. Temperature and pH were varied to investigate their effects on deposited Ni-Mo film characteristics.

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Electrodeposited Co-Mo-C Cathodes for Hydrogen Evolution in a Hot Concentrated NaOH Solution

Cited by 33 publications

References 20 publications

Electrodeposition of Electroactive Co–B and Co–B–C Alloys for Water Splitting Process in 8 M NaOH Solutions

Electrodeposition of Electroactive Co–B and Co–B–C Alloys for Water Splitting Process in 8 M NaOH Solutions

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

Electrochemically Deposition of High Mo Content Amorphous/Nanocrystalline Ni-Mo Using Ionic Liquids as Additive

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