Ion-beam formation of the active surface of methanol oxidation electrocatalysts on the tantalum substrates

Поплавский, В. В.; Stel’makh, T. S.; Matys, V. G.

doi:10.1134/s1027451012090121

Cited by 8 publications

(4 citation statements)

References 18 publications

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“…The layers formed by IBAD on the massive smooth metallic [5][6][7] and carbon [8] substrates have very low (less than 0.05 mg/cm 2 ) platinum content and exhibit high electrocatalytic activity in practically important, oxidation processes of organic alcohols, i.e. methanol and ethanol.…”

Section: Resultsmentioning

confidence: 99%

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Composition of Surface Layers Prepared by Ion Beam Assisted Deposition of Catalytic Metals from Pulsed Arc-Discharge Plasma onto Carbon Paper Substrates

2017

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The layers were prepared by ion beam assisted deposition of iridium and platinum onto AVCarb ® Carbon Fiber Paper P50 electrocatalyst supports for the production of diffusion layers of the membrane-electrode assemblies of low temperature fuel cells with polymer electrolyte membrane. Formation of the layers in the ion beam assisted deposition mode, by means of the deposition of metal and mixing of precipitating layer with the substrate by the accelerated (U = 10 kV) ions of the same metal, was performed. In this process neutral fraction of metal vapour and ionized plasma of vacuum pulsed electric arc discharge were used. The investigations of morphology and composition of layers were carried out by the scanning electron microscopy, energy dispersive X-ray microanalysis, wave dispersive X-ray fluorescence analysis, and the Rutherford backscattering spectrometry methods. It was established that the obtained catalytic layers contain atoms of the deposited metals and substrate material as well as impurity oxygen atoms. The surfaces contain also metal inclusions of several micrometer size which arise from the precipitation of deposited metal droplets from the arc discharge of an ion source. The content of iridium and platinum atoms in the layers is ≈ 2 × 10 16 cm −2 ; the concentration of the deposited metals equals about several atomic percent.

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Section: Resultsmentioning

confidence: 99%

“…Ion-beam modification of the materials whose operating abilities, particularly physicochemical (catalytic and corrosive) properties, are mainly controlled by the surface composition is of particular interest [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Composition of Surface Layers Prepared by Ion Beam Assisted Deposition of Catalytic Metals from Pulsed Arc-Discharge Plasma onto Carbon Paper Substrates

2017

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“…They differ in the very low (less than 0.05 mg/cm 2 [10][11][12][13][14]) platinum content, whereas the platinum content in the electrocatalysts for DMFC and DEFC, which are used at present, is 1-5 mg/cm 2 . Formation of an active surface during the ion beam assisted deposition of the two metals is carried out under vacuum conditions in two steps which compares favorably with the conventional multistage chemical methods for the preparation of supported catalysts based on impregnation of the support with the solutions of compounds of each metal, their reduction to the metallic state, drying and etc.…”

Section: Composition Of Catalytic Layers Under Investigation Includesmentioning

confidence: 99%

“…There were carried out the studies [10][11][12][13][14] of ionbeam formed catalytic layers on both metal and carbon substrates with smooth surfaces which indicated that upon the deposition of platinum from the pulsed vacuum plasma arc there are formed multicomponent amorphous surface layers of the thickness less than 100 nm having sufficiently high activity in the process of electrochemical oxidation of methanol and ethanol.…”

Section: Introductionmentioning

confidence: 99%

Ion Beam Formation of Electrocatalysts for Direct Methanol and Ethanol Fuel Cells on the Basis of Carbon Catalyst Supports

et al. 2017

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Ion-beam modification of materials whose service properties are mainly controlled by the surface composition is of especial interest, in particular, for electrocatalysts, namely electrodes of fuel cells -perspective chemical current sources. A catalyst is needed for effective operation of fuel cell. In this paper active layers of the electrocatalysts were prepared by ion beam assisted deposition of catalytic (platinum) and activating (cerium) metals onto carbon (AVCarb ® Carbon Fiber Paper P50 and Toray Carbon Fiber Paper TGP-H-060 T) catalyst supports. Formation of layers by ion beam assisted deposition by means of the deposition of metal and mixing of precipitating layer with the substrate by accelerated ions of the same metal, was carried out. Metal deposition and mixing between the precipitable layer and surface of the substrate by accelerated (U = 10 kV) ions of the same metal were conducted from a neutral vapor fraction and plasma of vacuum arc discharge of a pulsed electric arc ion source. Study of the morphology and composition of layers was carried out by the scanning electron microscopy, energy dispersive X-ray microanalysis, X-ray fluorescence analysis, and the Rutherford backscattering spectrometry methods. According to the investigations with the use of cyclic voltammetry, the electrocatalysts with the prepared layers exhibited catalytic activity in the reactions of electrochemical oxidation of methanol and ethanol, which form the basis for the principle of operation of low temperature direct methanol and direct ethanol fuel cells.

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Formation of catalytic and corrosion protective layers with use of ion beam assisted deposition of metals from vacuum arc discharge plasma

Poplavsky

Dorozhko

Matys

2021

J. Phys.: Conf. Ser.

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This paper presents a brief overview of our studies on the modification of materials using ion beam assisted deposition (IBAD) of metals from vacuum arc discharge plasma in order to form catalytically active and corrosion-resistant layers on the surface. Deposition of metals on different materials with simultaneous mixing of the deposited layer with the substrate surface by accelerated ions of the deposited metal was carried out in an experimental setup with a pulsed electric arc ion source. Catalytic and corrosion properties of the materials with the obtained layers were studied using electrochemical voltammetric measurements. The microstructure and composition of the resulting layers were studied using the SEM, EDX, WD-XRF, XPS, EBSD, and RBS methods.

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Ion-beam formation of the active surface of methanol oxidation electrocatalysts on the tantalum substrates

Cited by 8 publications

References 18 publications

Composition of Surface Layers Prepared by Ion Beam Assisted Deposition of Catalytic Metals from Pulsed Arc-Discharge Plasma onto Carbon Paper Substrates

Composition of Surface Layers Prepared by Ion Beam Assisted Deposition of Catalytic Metals from Pulsed Arc-Discharge Plasma onto Carbon Paper Substrates

Ion Beam Formation of Electrocatalysts for Direct Methanol and Ethanol Fuel Cells on the Basis of Carbon Catalyst Supports

Formation of catalytic and corrosion protective layers with use of ion beam assisted deposition of metals from vacuum arc discharge plasma

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