Parallel oxygen and chlorine evolution on Ru1−xNixO2−y nanostructured electrodes

Macounová, Kateřina; Makarova, Marina; Jirkovský, Jaromı́r; Franc, Jiří; Krtil, Petr

doi:10.1016/j.electacta.2007.11.014

Cited by 95 publications

(82 citation statements)

References 14 publications

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“…In this context, the development of solid-state water quality monitoring sensors based upon innovative approaches has progressed over the last few years. The obvious trend, established among researchers developing such sensors since the beginning of the twenty-first century, represents qualitative shift toward the use an alternative to Pt inexpensive oxide-sensing electrodes SEs (Sb 2 O 3 , IrO 2 , TiO 2 , MnO 2 , Ta 2 O 5 , PdO, RuO 2 , ZrO 2 and Co 2 O 3 ) providing high sensitivity to the measuring parameter [2][3][4][5][6][7]. Among these oxides, RuO 2 and IrO 2 are mixed electronic and ionic conductors, having an oxygen defect stoichiometry.…”

Section: Introductionmentioning

confidence: 99%

Potentiometric DO detection in water by ceramic sensor based on sub-micron RuO2 sensing electrode

Zhuiykov

2009

Ionics

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An alumina sensor using sub-micron RuO 2 sensing electrode (SE) was fabricated and examined for potentiometric dissolved oxygen (DO) detection in water at a temperature range of 9-35°C. The electromotive force (emf) response at these temperatures was linear to the logarithm of DO concentration in the range from 0.6 to 8.0 ppm (log[O 2 ], −4.71 to −3.59). RuO 2 -SE displays a Nernstian slope of −41 mV per decade at pH 8.0. It was also found that the response/recovery time to DO changes were sluggish as the water temperature cools down. Response time T 90 to DO changes increased from 8 min at a temperature of 23°C to about 30 min at a temperature of 9°C. The proton conductivity of hydrous RuO 2 appears to be due to the dissociative adsorption of water and the formation of acidic OH groups in Ru (III,IV) cluster ions. In strong alkaline solutions, the sensor's emf exhibited a mixed potential of fast and slow electrochemical reactions involving DO, RuO 4 2− and OH − ions. The results also revealed that as pH of the solution increases to pH 10.0-13.0, the response/recovery rate becomes faster, stabilizing more or less quickly depending upon the solution alkalinity. Scanning electron microscopy, energy dispersive X-rayanalysis and impedance spectroscopy techniques were used to examine respectively the morphology, crystalline structure and electrochemical behaviour of sub-micron RuO 2 oxides.

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Section: Introductionmentioning

confidence: 99%

Potentiometric DO detection in water by ceramic sensor based on sub-micron RuO2 sensing electrode

Zhuiykov

2009

Ionics

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“…However, the XRD patterns of the leached-Ir 0.7 Ni 0.3 O x are very similar to the pure pyrolyzedIrO x , except for the slight shift of peak positions to higher 2θ values (inset in Fig. 3), which should be a result of lattice contraction of IrO 2 due to Ni doping [42,43]. Because XRD is a bulk technique resulting in the surface-insensitive nature of the obtained responses, the leached-Ir 0.7 Ni 0.3 O x and pyrolyzed-Ir 0.7 Ni 0.3 O x exhibit similar XRD patterns.…”

Section: Resultsmentioning

confidence: 68%

Selective-leaching method to fabricate an Ir surface-enriched Ir-Ni oxide electrocatalyst for water oxidation

Chen

Tian

et al. 2016

J Solid State Electrochem

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Durable and precious metal-lean electrocatalyst for water oxidation in acidic media would be of great significance for the large-scale application of acidic water electrolysis. Here, we report an Ir-Ni binary oxide electrocatalyst for the oxygen evolution reaction (OER) fabricated by acid leaching of Ni from Ni-rich composite oxides prepared using pyrolysis method. This Ni-leached binary oxide possesses Ir-enriched surface, porous morphology, and rutile phase structure of IrO 2 with contracted lattice. In contrast, Ir-Ni binary oxide with the same composition prepared using simple pyrolysis method exhibits a rod-like aggregated morphology with Ni-enriched surface. Catalytic activity for OER of the Ni-leached binary oxide is higher than that of the pyrolyzed Ir-Ni oxide and pure IrO 2 . More importantly, the Ni-leached binary oxide exhibits much superior durability during continuous oxygen evolution process under a constant potential of 1.6 V compared with the pyrolyzed binary oxide and pure IrO 2. Attributed to the Ir-rich surface and the anchor effect of inner Ni atoms to outer Ir atoms, the Ni-leached binary oxide shows a possibility of reducing the demand of the expensive and scarce Ir in OER electrocatalyst for acidic water splitting.

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“…Currently, dimensionally stable anodes (DSAs) are mainly applied in experimental preparation, characterization and performance testing, etc. Moreover, DSAs have application in the doping coating of ruthenium-titanium oxides, in which other elements or oxides such as ZrO 2 , IrO 2 , SnO 2 , Ta 2 O 5 , Co 3 O 4 , or NiO are selected as the doped materials to form binary or ternary mixed oxides [2][3][4][5][6][7][8][9][10]. Variation in the content and preparation conditions of the dopant species causes differences in the composition and morphology of the coating and thereby may improve the stability of the coating and the catalytic activity of chlorine evolution.…”

Section: Introductionmentioning

confidence: 99%

Quantum-chemical study on the catalytic activity of TinRumO2 (110) surfaces on chlorine evolution

Pan

Wang

et al. 2015

Chinese Chemical Letters

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Parallel oxygen and chlorine evolution on Ru1−xNixO2−y nanostructured electrodes

Cited by 95 publications

References 14 publications

Potentiometric DO detection in water by ceramic sensor based on sub-micron RuO2 sensing electrode

Potentiometric DO detection in water by ceramic sensor based on sub-micron RuO2 sensing electrode

Selective-leaching method to fabricate an Ir surface-enriched Ir-Ni oxide electrocatalyst for water oxidation

Quantum-chemical study on the catalytic activity of TinRumO2 (110) surfaces on chlorine evolution

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