Electrochemical hydrogen reactions on tungsten carbide

Progress in catalysis is driven by society's needs. The development of new electrocatalysts to make renewable and clean fuels from abundant and easily accessible resources is among the most challenging and demanding tasks for today's scientist and engineers. The electrochemical splitting of water into hydrogen and oxygen has been known for over 200 years, but in the last decade and motivated by the perspective of solar hydrogen production, new catalysts made of earth-abundant materials have emerged. Here we present an overview of recent developments of the non-noble metal catalysts for electrochemical hydrogen evolution reaction (HER). Emphasis is given to the nanostructuring of industrially relevant hydrotreating catalysts as potential HER electrocatalysts. The new syntheses and nanostructuring approaches might pave the way to future developments of highly efficient catalysts for energy conversion.

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“…Consequently, tungsten carbides have been explored for HDT reactions, 58,59 and for HER. [68][69][70][71][72][73][74] For example, Sokolsky et al…”

Section: Tungsten Carbides (W X C) and Tungsten Carbonitride (Wcn) Comentioning

confidence: 99%

“…68 Recently, Schröder and co-workers showed that bulk WC had j = 10 mA cm -2 at  = 300 mV. 61 74 Motivated by these promising results and the intrinsic properties of WC, further investigations of the HER activity of tungsten carbides were performed to improve their activity.…”

Section: Tungsten Carbides (W X C) and Tungsten Carbonitride (Wcn) Comentioning

confidence: 99%

Nanostructured hydrotreating catalysts for electrochemical hydrogen evolution

2014

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“…Sokolsky et al [21] and Zoltowsky [23] investigated hydrogen evolution on smooth WC disks prepared according to the same technique. However, the values of i differed by at least one order of magnitude: within the same region of g, in one study [21] one linear section was obtained with b = 100-115 mV/dec, while in the other [23], a section with b = 65 mV/dec was obtained at low g with a slow increase in the value of b with increasing overvoltage.…”

Section: Introductionmentioning

confidence: 99%

“…An analysis of literature data [21][22][23][24][25][26][27][28] showed that the differences between the data obtained by different authors could be connected not only with the different methods of preparation and dispersity of the carbides, but also with features of the method used for the measurement of the log i ) g curves.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen evolution on Ni/WC composite coatings

et al. 2006

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The catalytic activity for the hydrogen evolution reaction (HER) of Ni/WC composites obtained by electrochemical deposition of nickel from a conventional Watt's bath, using two different ways of depositing the WC particles, was investigated. All the composite coatings exhibited electrocatalytic activity for the HER larger than that of pure Ni in both alkaline and acid solution. The activity increased with increasing content of WC in the coating and, in the pulsed current regime, with increasing frequency of pulsation. In addition, coatings with smaller particles incorporated exhibited higher activity than those with larger particles. At a constant potential, an order of magnitude higher current densities were obtained in some cases.

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“…Similarly, Tungsten carbide (WC) attracts much attention owing to its unique physical and chemical properties such as extreme hardness, high melting point, chemical inertness, interesting catalytic behaviour etc, and belongs to the most promising engineering materials with a wide range of industrial applications [10][11][12]. Nickel based WC composites, in particular, finds their main uses as hard faces for anti wear [13][14][15], anticorrosive [13] and as electrocatalytic cathode for hydrogen evolution reaction [16].…”

Section: Introductionmentioning

confidence: 99%

Electrocodeposition and Characterization of Ni-WC Composite Coating From Non − Aqueous Bath

Singh¹,

Tripathi²,

Singh

2013

IJMSA

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Abstract:Composite coating of tungsten carbide (WC) in the matrix of nickel has been achieved by direct current (DC) electrodeposition technique using a non aqueous bath. The deposition parameters such as current density, bath temperature, and stirring rate were maintained at constant levels for all the coating configurations. The composition of the coating and its microstructure were studied using energy dispersive x-ray spectroscopy, uv-vis spectrophotometry and x-ray diffraction, respectively. Surface morphology of the coatings was studied by scanning electron microscopy (SEM and TEM). Effect of heat treatment on the deposits microstructures and microhardness was also investigated. The Ni-WC composites, prepared at optimum conditions, exhibited improved mechanical properties in comparison to pure nickel electrodeposits.

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Electrochemical hydrogen reactions on tungsten carbide

Cited by 62 publications

References 6 publications

Nanostructured hydrotreating catalysts for electrochemical hydrogen evolution

Nanostructured hydrotreating catalysts for electrochemical hydrogen evolution

Hydrogen evolution on Ni/WC composite coatings

Electrocodeposition and Characterization of Ni-WC Composite Coating From Non − Aqueous Bath

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