Iridium-tin mixed oxide anode coatings

Balko, E. N.; Nguyen, Phuc H.

doi:10.1007/bf01034045

Cited by 56 publications

(41 citation statements)

References 19 publications

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“…The Tafel slopes for Ir-Sn-Sb-O (40) and Ir-Sn-Sb-O (10) were 73 and 75 mV dec -1 , respectively. These values are similar to those previously reported in the literature for Ir-Sn oxide (Ir contents of 50-100 mol%) DSA electrodes and IrO 2 electrodes, 70 mV dec -1 [9,28] and 71 mV dec -1 [29], respectively. In the literature, Tafel slopes close to 60 mV dec -1 suggest that the rds of the reaction is step (2) according to the mechanism proposed for the OER on active oxide electrodes in acidic media as shown below [19,30]: …”

Section: Electrochemical Characterizationsupporting

confidence: 91%

Electrochemical study of Ir–Sn–Sb–O materials as catalyst-supports for the oxygen evolution reaction

et al. 2015

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A novel material, with a general formula of IrSn-Sb-O, was synthesized for use in solid polymer electrolyte water electrolyzers (SPEWEs) by the thermal decomposition of the chloride precursors H 2 IrCl 6 , SnCl 4 Á5H 2 O, and SbCl 3 in ethanol. The material functions simultaneously as an electrocatalyst and support for the oxygen evolution reaction (OER). Two different H 2 IrCl 6 proportions in the reaction mixture were tested to observe the effect of this proportion on the electrocatalytic activity and composition of the materials. Physicochemical properties of Ir-Sn-S-O were characterized by X-ray diffraction, scanning electron microscopy. The electrochemical properties of the materials studied were measured using cyclic voltammetry, linear scan voltammetry, and electrochemical impedance spectroscopy. Mechanical mixtures of IrO 2 with Vulcan carbon or antimony doped tin oxide were also tested with respect to the OER to compare the properties of Ir-Sn-Sb-O. The results indicate that the catalyst-support materials presented nanometric sizes (1-2 nm) and electrocatalytic properties similar to IrO 2 supported on Vulcan carbon but with higher stability toward the oxygen evolution reaction. The synthesized mixed oxides could be a suitable anode material in SPEWEs.

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Section: Electrochemical Characterizationsupporting

confidence: 91%

Electrochemical study of Ir–Sn–Sb–O materials as catalyst-supports for the oxygen evolution reaction

et al. 2015

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“…Rutile IrO 2 behaves like a metal material, which has a high electronic conductivity at room temperature, thereby it is widely used as O 2 and Cl 2 evolution electrode, oxidation resistance coating and pH sensor material [1][2][3][4][5][6]. In the past decades, IrO 2 -based metallic oxide catalysts for oxygen evolution have attracted much attention.…”

Section: Introductionmentioning

confidence: 99%

A novel IrO2 electrode with iridium–titanium oxide interlayers from a mixture of TiN nanoparticle and H2IrCl6 solution

et al. 2009

J Appl Electrochem

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A novel IrO 2 anode on titanium substrate with iridium-titanium oxide interlayer (Ti/IrO x -TiO 2 /IrO 2 ) was prepared and investigated for oxygen evolution. IrO x -TiO 2 interlayer was coated on titanium substrate by impregnation-thermal decomposition method from a mixture of TiN nanoparticles and H 2 IrCl 6 solution at 500°C. The results showed that the service life of Ti/IrO x -TiO 2 /IrO 2 was a factor of six times longer than that of Ti/IrO 2 , which was attributed to the IrO x -TiO 2 interlayer, it could form a metastable solid solution between IrO x and thin titanium oxide layer on titanium substrate during calcination. The interlayer contributed to the decrease in migration rate of oxygen atom or molecule toward substrate and the increase in bonding force among IrO 2 layer, interlayer, and substrate. Therefore, besides keeping high electrocatalytic activity, the service life of Ti/IrO x -TiO 2 /IrO 2 electrode was greatly improved, and its overall electrocatalytic performance for oxygen evolution was increased as well.

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“…Nevertheless, IrO 2 is much more expensive than RuO 2 and its activity is slightly lower. To save cost and/or to improve the coating property, other components are usually added [12][13][14][15][16][17][18]. The stability had been improved significantly for Ti-based ternary IrO 2 -Sb 2 O 5 -SnO 2 anode.…”

Section: Introductionmentioning

confidence: 99%

Effects of the geometry and operating temperature on the stability of Ti/IrO2–SnO2–Sb2O5 electrodes for O2 evolution

2010

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Ternary IrO 2 -Sb 2 O 5 -SnO 2 anode has shown its superiorities over IrO 2 and many other electrocatalysts for O 2 evolution, in terms of electrochemical stability, activity and cost. The performance of IrO 2 -Sb 2 O 5 -SnO 2 anodes is affected by its electrochemical properties and operating conditions. In this paper, the electrochemical stability and activity of the Ti/IrO 2 -Sb 2 O 5 -SnO 2 anodes prepared with three different geometries were investigated under different operating conditions. It was found that anodes with large mean curvature have high electrochemical stability. Although increasing temperature results in a decrease in the stability of Ti/IrO 2 -Sb 2 O 5 -SnO 2 , the anode with a mean curvature of 200 m -1 still shows acceptable service life even at 70°C. This tolerance of high temperature was attributed to the thermal expansion difference between the substrate and the coating layer, the redox window for Ir(V)/ Ir(IV) conversion, and the redox reversibility of Sb and Sn species in the coating layer.

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Iridium-tin mixed oxide anode coatings

Cited by 56 publications

References 19 publications

Electrochemical study of Ir–Sn–Sb–O materials as catalyst-supports for the oxygen evolution reaction

Electrochemical study of Ir–Sn–Sb–O materials as catalyst-supports for the oxygen evolution reaction

A novel IrO2 electrode with iridium–titanium oxide interlayers from a mixture of TiN nanoparticle and H2IrCl6 solution

Effects of the geometry and operating temperature on the stability of Ti/IrO2–SnO2–Sb2O5 electrodes for O2 evolution

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