Catalytically active cobalt-copper-oxide layers on aluminum and titanium

Lukiyanchuk, I. V.; Chernykh, I. V.; Руднев, В. С.; Ustinov, A. Yu.; Tyrina, L. M.; Недозоров, П. М.; Dmitrieva, E. E.

doi:10.1134/s2070205114020105

Cited by 8 publications

(4 citation statements)

References 18 publications

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“…The reactivity of PEO layers can be easily influenced by changing the composition of the electrolytic bath, which is usually completed by adding soluble ions of dopants, i.e., Ni and Cu, to the electrolytic bath to prepare catalytic materials for CO to CO 2 oxidation [ 27 , 28 , 29 ], photoactive materials [ 26 , 30 , 31 ], biomaterials with possible antibacterial properties [ 32 , 33 ] or even catalysts for desulphurization and denitrification [ 34 ]. Other methods of doping of PEO layers are the impregnation of the coating with the soluble salt of the dopant, followed by drying and air annealing (500–1050 °C) [ 29 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ], the hydrothermal route [ 43 , 44 ], electrodeposition [ 45 , 46 ], the sol-gel method [ 47 ], electroless plating [ 48 ], the solid-state reaction method [ 49 ], the alcohol-thermal method [ 50 ], reactive magnetron co-sputtering [ 51 ], dip coating [ 52 ] or even the coating of different materials with a TiO 2 paste [ 53 ]. A different approach is the preparation of an electrolytic bath in suspension [ 18 , 54 , 55 , 56 ].…”

Section: Introductionmentioning

confidence: 99%

Plasma Electrolytic Oxidation of Titanium in Ni and Cu Hydroxide Suspensions towards Preparation of Electrocatalysts for Urea Oxidation

et al. 2023

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The increasing climate crisis requires an improvement in renewable energy technologies. One of them are fuel cells, devices that are capable of generating electricity directly from the chemical reaction that is taking place inside of them. Despite the advantages of these solutions, a lack of the appropriate materials is holding them back from commercialization. This research shows preliminary results from a simple way to prepare black TiO2 coatings, doped with Cu or Ni using the plasma electrolytic oxidation process, which can be used as anodes in urea-fueled fuel cells. They show activity toward urea oxidation, with a maximum current density of 130 μA cm−2 (@1 V vs. Hg|HgO) observed for Cu-enhanced TiO2 and low potential of only 0.742 V (Vs Hg|HgO) required for 50 μA cm−2 for Ni-enhanced TiO2. These results demonstrate how the PEO process can be used for the preparation of TiO2-based doped materials with electrocatalytic properties toward urea electrooxidation.

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Section: Introductionmentioning

confidence: 99%

Plasma Electrolytic Oxidation of Titanium in Ni and Cu Hydroxide Suspensions towards Preparation of Electrocatalysts for Urea Oxidation

et al. 2023

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“…Commercial catalysts for CO oxidation are typically non-noble metal oxide catalysts, such as the mesoporous Cu-Mn Hopcalite catalyst [21], or mixtures of CuO, Ce 3 O 4 , and NiO with CeO 2 , ZnO, TiO 2 [22][23][24], SiO 2 [25], or Al 2 O 3 [26,27]. An alternative solution is to use noble-metal-supported catalysts, such as Pt, Au, Pd, or Ru [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

CO Oxidation over Pd Catalyst Supported on Porous TiO2 Prepared by Plasma Electrolytic Oxidation (PEO) of a Ti Metallic Carrier

et al. 2022

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A porous TiO2 layer was prepared with the plasma electrolytic oxidation (PEO) of Ti. In a further step, Pd was deposited on the TiO2 surface layer using the adsorption method. The activity of the Pd/TiO2/Ti catalyst was investigated during the oxidation of CO to CO2 in a mixture of air with 5% CO. The structure of the catalytic active layer was studied using a scanning electron microscope equipped with an energy dispersive spectrometer (SEM-EDS), time-of-flight secondary ion mass spectrometry (TOF-SIMS), inductively coupled plasma mass spectrometry (ICP-MS), and X-ray diffraction (XRD). The PEO process provided a porous TiO2 layer with a uniform thickness in the range of 5–10 µm, which is desirable for the production of Pd-supported catalysts. A TOF-SIMS analysis showed the formation of Pd nanoparticles after the adsorption treatment. The conversion of CO to CO2 in all samples was achieved at 150–280 °C, depending on the concentration of Pd. The composition of Pd/ TiO2/Ti was determined using ICP-MS. The optimum concentration of Pd on the surface of the catalyst was approximately 0.14% wt. This concentration was obtained when a 0.4% PdCl2 solution was used in the adsorption process. Increasing the concentration of PdCl2 did not lead to a further improvement in the activity of Pd/ TiO2/Ti.

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“…Thicknesses of the coatings vary from 1 µm up to hundreds of micrometers [ 7 , 19 , 20 ], which results in different properties of the surface coating/passive layer compared to the metallic matrix. These phenomena are used in a variety of applications, including catalysts [ 21 ], biomedical implantable devices, joint prostheses, fracture fixation devices and dental implants [ 22 ], aerospace [ 23 ], chemical sensors [ 24 ], and wear-resistant materials [ 25 ]. The chemical composition, corrosion resistance of PEO coatings, as well as their thickness and porosity, depend on the electrolyte composition and used voltage or current regime (DC, AC, pulse).…”

Section: Introductionmentioning

confidence: 99%

Development of Porous Coatings Enriched with Magnesium and Zinc Obtained by DC Plasma Electrolytic Oxidation

et al. 2018

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Coatings with developed surface stereometry, being based on a porous system, may be obtained by plasma electrolytic oxidation, PEO (micro arc oxidation, MAO). In this paper, we present novel porous coatings, which may be used, e.g., in micromachine’s biocompatible sensors’ housing, obtained in electrolytes containing magnesium nitrate hexahydrate Mg(NO3)2·6H2O and/or zinc nitrate hexahydrate Zn(NO3)2·6H2O in concentrated phosphoric acid H3PO4 (85% w/w). Complementary techniques are used for coatings’ surface characterization, such as scanning electron microscopy (SEM), for surface imaging as well as for chemical semi-quantitative analysis via energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), glow discharge optical emission spectroscopy (GDOES), and X-ray powder diffraction (XRD). The results have shown that increasing contents of salts (here, 250 g/L Mg(NO3)2·6H2O and 250 g/L Zn(NO3)2·6H2O) in electrolyte result in increasing of Mg/P and Zn/P ratios, as well as coating thickness. It was also found that by increasing the PEO voltage, the Zn/P and Mg/P ratios increase as well. In addition, the analysis of XPS spectra revealed the existence in 10 nm top of coating magnesium (Mg2+), zinc (Zn2+), titanium (Ti4+), and phosphorus compounds (PO43−, or HPO42−, or H2PO4−, or P2O74−).

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Catalytically active cobalt-copper-oxide layers on aluminum and titanium

Cited by 8 publications

References 18 publications

Plasma Electrolytic Oxidation of Titanium in Ni and Cu Hydroxide Suspensions towards Preparation of Electrocatalysts for Urea Oxidation

Plasma Electrolytic Oxidation of Titanium in Ni and Cu Hydroxide Suspensions towards Preparation of Electrocatalysts for Urea Oxidation

CO Oxidation over Pd Catalyst Supported on Porous TiO2 Prepared by Plasma Electrolytic Oxidation (PEO) of a Ti Metallic Carrier

Development of Porous Coatings Enriched with Magnesium and Zinc Obtained by DC Plasma Electrolytic Oxidation

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