Comparison of Ir oxide film redox kinetics in sulfuric and p-toluene sulfonic acid solutions

Bock, Christina; Birss, Viola I.

doi:10.1016/s0013-4686(00)00663-0

Cited by 15 publications

(7 citation statements)

References 33 publications

(77 reference statements)

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“…This indicates that more time is needed for all electro-active film sites to react for thicker oxide films. This is consistent with prior work [17,18] that has shown that the time needed for complete charge recovery for inorganic oxide films and conductive polymers increases with increasing film thickness.…”

Section: Electrochemical Characteristics Of Wo X Filmssupporting

confidence: 92%

The electrochemical oxidation of organics using tungsten oxide based electrodes

Bock

MacDougall

2002

Electrochimica Acta

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High surface area tungsten oxide (WO x ) based electrodes containing centers of Pt, Sn or Ru were synthesized. The WO x electrodes were found to display good capacitive behavior and relatively high specific capacitance values of up to 180 F gThe oxidation behavior of particularly HCOOH and (COOH) 2 , using the WO x electrodes containing Pt and Sn centers (Pt/WO x and Sn/ WO x , respectively), was studied in detail in aqueous solutions at high potentials, i.e. at which O 2 is evolved. Both HCOOH and (COOH) 2 appear to be oxidized following 1st order kinetics. The (COOH) 2 oxidation reaction is faster than the HCOOH reaction using otherwise the same experimental conditions. The reaction mechanism of both the HCOOH and (COOH) 2 oxidation was found to most likely involve the adsorptive interaction of the two organics with the anode surface. The WO x based anodes appear to be promising catalysts for the anodic oxidation of both (COOH) 2 and HCOOH. #

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Section: Electrochemical Characteristics Of Wo X Filmssupporting

confidence: 92%

The electrochemical oxidation of organics using tungsten oxide based electrodes

Bock

MacDougall

2002

Electrochimica Acta

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“…The CV response of the IrO 2 / PDDA-bilayers strongly resembles that previously reported for hydrous iridium oxide films (HIROFs). [38][39][40][41][42][43][44][45][46][47][48] The two reversible redox couples are commonly attributed to the Ir(III)/Ir(IV) and Ir(IV)/Ir(V) transitions, respectively, reflecting the multiple redox states available for the IrO 2 centers. Interestingly, the electrochemical response strikingly contrasts with the one observed in flocculated films where the charge associated to the transformation between Ir(III)/Ir(IV) is higher than the one assigned to Ir(IV)/Ir(V).…”

Section: Spectro-electrochemistry Of Lbl Deposited Iro 2 Np Films On mentioning

confidence: 99%

Boosting water oxidation layer-by-layer

Hidalgo-Acosta

Scanlon

Méndez

et al. 2016

Phys. Chem. Chem. Phys.

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), moving from acidic to alkaline conditions. Bulk electrolysis experiments revealed that the IrO 2 /PDDA films were stable and adherent under acidic and neutral conditions but degraded in alkaline solutions. Oxygen was evolved with Faradaic efficiencies approaching 100% under acidic (pH 1) and neutral (pH 7) conditions, and 88% in alkaline solutions (pH 13).This layer-by-layer approach forms the basis of future large-scale OER electrode development using ink-jet printing technology.

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“…Equivalent circuits * Author for correspondence (kgnn@pdn.ac.lk) were used to describe the influence of each component of the oxide layer on the impedance spectrum. Typical electric circuits are modelled to the oxide electrode elements that describe the ohmic resistance associated with solution and the oxide film, as well as the charge transfer resistance of the processes that occur at the oxide/solution interface [2,[13][14][15]. Moreover, the superior electrocatalytic properties of an anode material towards oxygen evolution can be achieved by high exchange current density and low Tafel slope.…”

Section: Introductionmentioning

confidence: 99%

“…The goal of the present work is to find electrochemical properties of OER that developed Ti/IrO 2 -SnO 2 electrode in Na 2 SO 4 solution. So far, many researchers have been carrying out a large number of investigations on the works of IrO 2 -based DSAs in acidic and alkaline solutions for OER [2,13,15]. However, little work is known about investigation for OER of IrO 2 type electrodes in neutral solutions [16].…”

Section: Introductionmentioning

confidence: 99%

Oxygen evolution reaction of Ti/IrO2–SnO2 electrode: a study by cyclic voltammetry, Tafel lines, EIS and SEM

2016

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The electrochemical characteristics towards oxygen evolution reaction of thermally prepared Ti/IrO 2 -SnO 2 electrodes were examined. Two electrodes prepared with two different IrO 2 compositions were analysed in Na 2 SO 4 electrolyte. Cyclic voltammetry, steady state polarization curves, impedance spectroscopy and open circuit potential were performed to investigate the performance and stability of these electrocatalysts. It has found that the surface electrochemistry of Ti/IrO 2 -SnO 2 anodes are governed by the Ir(III)/Ir(IV) couple. The impedance spectroscopy investigation permitted to propose an equivalent circuit to describe the modifications occurred in different potentials during oxygen evolution reaction. The same equivalent circuit was found to describe both electrodes. Moreover, the double layer capacitance and microstructure analysis reflected that the inner surface makes a large contribution to the electrochemically active surface area of Ti/IrO 2 -SnO 2 anodes. It was found that the stability and the electrocatalytic activity mainly depend on changes in the IrO 2 composition of the electrode and its morphology during oxygen evolution reaction.

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Comparison of Ir oxide film redox kinetics in sulfuric and p-toluene sulfonic acid solutions

Cited by 15 publications

References 33 publications

The electrochemical oxidation of organics using tungsten oxide based electrodes

The electrochemical oxidation of organics using tungsten oxide based electrodes

Boosting water oxidation layer-by-layer

Oxygen evolution reaction of Ti/IrO2–SnO2 electrode: a study by cyclic voltammetry, Tafel lines, EIS and SEM

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