Electrochemical properties of heat-treated platinized titanium

Kasian, Olga; Luk’yanenko, T. V.; Величенко, А. Б.

doi:10.1134/s2070205113050043

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…On the other hand, mixing of Ir oxide with significantly less active but more stable materials, e.g., Ti [17] or Sn [18] typically results in catalysts showing very high stability against dissolution. In this case, however, deterioration of electrocatalytic performance with time is to be expected, taking into account the semiconducting nature of stoichiometric TiO 2 and SnO 2 [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Using Instability of a Non-stoichiometric Mixed Oxide Oxygen Evolution Catalyst As a Tool to Improve Its Electrocatalytic Performance

et al. 2017

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Owing to their superior electrocatalytic performance, non-stoichiometric mixed oxides are often considered as promising electrocatalysts for the acidic oxygen evolution reaction (OER). Their activity and stability can be superior to those of the state-of-the-art IrO 2 catalysts, although the exact nature of this phenomenon is not yet understood. In the current work, a Ir 0.7 Sn 0.3 O 2-x thin-film electrode is taken as a representative example for a thorough evaluation of OER activity of the non-stoichiometric oxides. Complementary activity and stability analysis of Ir 0.7 Sn 0.3 O 2-x electrodes is achieved using a setup based on an electrochemical scanning flow cell and ICP-MS. The obtained ICP-MS data presents an unambiguous proof of the preferential dissolution of the less noble Sn from the mixed oxide during OER. While less than a monolayer of Ir is dissolved after a prolonged electrolysis of 1400 min during which its dissolution rate drops to near zero, the amount of Sn lost is ten monolayers. The latter finding is confirmed by XPS analysis, which besides showing Ir surface enrichment also indicates a gradual transformation of Ir 0 to Ir III species. This transition is beneficial for electrode activity, as the overpotential for OER at j = 5 mA cm −2 was decreasing up to 300 mV. The increase in electrode activity is attributed to several mechanisms including generation of Ir III active sites and overall surface area increase. A generalized description of OER catalysis by Ir-based materials is given, including data from the current work as well as from other Ir-based mixed oxides, such as Ir-Ru-O and Ir-Ni-O.

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Section: Introductionmentioning

confidence: 99%

Using Instability of a Non-stoichiometric Mixed Oxide Oxygen Evolution Catalyst As a Tool to Improve Its Electrocatalytic Performance

et al. 2017

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“…1a). Morphology of platinized Ebonex ® strongly depends on amount of electrodeposited Pt that typical for platinized electrodes obtained by elecrodeposition (10,11,13). Coatings containing low amount of Pt (2 mg/cm 2 ) are nonuniform and look like islands of Pt on substrate (Fig.…”

Section: Ecs Transactions 58 (19) 75-84 (2014)mentioning

confidence: 99%

Anodes Based on Pt Doped Titanium Sub-Oxides

et al. 2014

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Effects of thermal treatment and amount of electrodeposited Pt on electrocatalytic activity of materials based on platinized Ebonex® were investigated. Surface morphology, phase and chemical composition were found to be strongly depended on temperature of electrode preparation. Crystallite size of platinum coating was shown to increase with temperature of thermal treatment. At the same time decrease in strains in coating with temperature was observed providing better mechanical stability of the thermally treated electrodes. Materials based on platinized Ebonex® were shown to be n-type semiconductors that affect their electrochemical behavior. An increase in the flatband potential with temperature, and the donor concentration decrease were observed due to both oxidation of Pt and TiO2 formation. Some of platinized Ebonex anodes could be recommended for application in a trivalent chromium electroplating bath owing to low rates of Cr(III) electrooxidation and extended service life.

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“…One can functionalize titania and TNT or enhance its initial functional (sensor, catalytic, and other) properties via its modification with metals and, in par ticular, noble metal nanoparticles (Ag, Au, Pt, Pd, their alloys) [20][21][22]. For example, the studies of cat alytic activity of nanotubular titania coated by gold nanoparticles with respect to oxygen reduction reac tion showed that it is three times as much as that for flat gold electrode [23].…”

Section: Introductionmentioning

confidence: 99%

Formation of nanocomposites of platinum with nanotubular titanium dioxide

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Касаткина

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et al. 2014

Prot Met Phys Chem Surf

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Metal oxide nanocomposites of platinized titania nanotube arrays (Pt TNT) have been formed via electrochemical anodization-precipitation. Initially, the vertically aligned amorphous TiO 2 nanotube arrays (TNTs) were formed in accordance with potentiostatic electrochemical anodization of titanium with the use of 1 M H 2 SO 4 + 0.3% HF electrolyte. Then, using the potentiostatic and pulse electrodeposition, precipitates of Pt on TNT were formed from 0.04 M solution of chloroplatinic acid (CPA). It has been shown with the use of SEM and Raman spectroscopy that, in order to prepare functional metal oxide Pt TNT nanocomposites, pulse electrodeposition and subsequent annealing at 400°C are preferable, because they lead to TNTs that are homogeneously distributed along the surface and in bulk (with anatase structure) for platinized layers and conglomerates.

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Electrochemical properties of heat-treated platinized titanium

Cited by 5 publications

References 20 publications

Using Instability of a Non-stoichiometric Mixed Oxide Oxygen Evolution Catalyst As a Tool to Improve Its Electrocatalytic Performance

Using Instability of a Non-stoichiometric Mixed Oxide Oxygen Evolution Catalyst As a Tool to Improve Its Electrocatalytic Performance

Anodes Based on Pt Doped Titanium Sub-Oxides

Formation of nanocomposites of platinum with nanotubular titanium dioxide

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