Ion beam formation of the catalytically active surface of titanium electrodes

Поплавский, В. В.; Mishchenko, T. S.; Matys, V. G.

doi:10.1134/s1027451010040051

Cited by 13 publications

(7 citation statements)

References 6 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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“…In the RBS technique, the surface layers were examined by measuring the spectra of scattered 4 He ions (E 0 = 1.0 or 1.3 MeV) using an AN-2500 accelerator (High Voltage Engineering Europe). During recording of the spectra, the analyzing particle beam was normally incident to the sample surface and the scattering angle was 170…”

Section: Experimental Details and Resultsmentioning

confidence: 99%

Composition and Microstructure of Surface Layers Produced by Ion Beam Assisted Deposition of Metals from a Pulsed Arc-Discharge Plasma onto Aluminum Substrates

et al. 2015

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Ion beam assisted deposition of alloying metals (Zn, Cd, Zr, Cr) onto pure aluminum and aluminum alloy substrates from the plasma of a pulsed arc discharge for the purpose of materials corrosion stability was carried out. The Rutherford backscattering spectrometry, electron backscatter diraction, scanning electron microscopy, and electron probe microanalysis methods were applied to investigate composition and microstructure of the prepared layers. It was found that the obtained layers are characterized by amorphous atomic structure and contain the atoms of deposited metal, substrate material components, as well as impurities of oxygen and carbon; their thickness was measured to be ≈30100 nm.

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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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Ion beam formation of the catalytically active surface of titanium electrodes

Cited by 13 publications

References 6 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

Composition and Microstructure of Surface Layers Produced by Ion Beam Assisted Deposition of Metals from a Pulsed Arc-Discharge Plasma onto Aluminum Substrates

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

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