Remarkably high activity of electrodeposited IrO2 film for electrocatalytic water oxidation

Yagi, Masayuki; Tomita, Emi

doi:10.1016/j.jelechem.2005.01.030

Cited by 125 publications

(116 citation statements)

References 17 publications

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“…14 They also agree with the results for IrO 2 /ITO electrodes deposited by electrodeposition 43 and for IrO 2 powders prepared by a pyrolytic process. 44 It is important to notice that the onset potential for the OER (~1.4 V vs. HESS) obtained on the IrO 2 /BDD electrode has a similar value to that obtained using elaborated binary and ternary electrodes, i.e., Ti/RuO 2 -Nb 2 O 5 electrodes prepared by the polymeric precursor method 45 and for Ti/Ru 0.3 Pb (0.7-x) Ti x O 2 electrodes prepared by thermal decomposition of ruthenium, titanium and lead inorganic salts dissolved in isopropanol.…”

Section: Resultssupporting

confidence: 72%

AFM studies and electrochemical characterization of boron-doped diamond surfaces modified with metal oxides by the Sol-Gel method

Suffredini¹,

Salazar‐Banda²,

Okamura³

et al. 2006

J. Braz. Chem. Soc.

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Com o objetivo de aprofundar investigações anteriores, foram realizadas modificações superficiais diretas em eletrodos de diamante dopados com boro (DDB), com óxidos metálicos (PtO x , RuO 2 , IrO 2 e PbO 2 ) e com alguns compósitos mistos, utilizando a técnica Sol-Gel. Estes materiais foram estudados por microscopia de força atômica (MFA) e os resultados indicaram a formação de sítios de deposição heterogênea. Técnicas eletroquímicas foram utilizadas para estabelecer a atividade catalítica para a reação de desprendimento de oxigênio (RDO) e para reação de oxidação de etanol em meio ácido utilizando os compósitos de PtO x e PtO x -RuO 2 . Testou-se ainda a estabilidade de um depósito de PtO x , recoberto por um filme de Nafion ® , por meio de operação contínua de longa duração. Estudos de voltametria cíclica comparativa mostraram que a área superficial ativa dos novos materiais mudou consideravelmente com o método de modificação proposto. O eletrodo de IrO 2 /BDD mostrou o melhor desempenho para a RDO, iniciando o processo de oxidação em ~ 1.4 V vs. HESS, valor este 200 mV menor do que o observado sobre um eletrodo de PtO x /BDD. Foi observada uma pequena perda da atividade do eletrodo de PtO x /BDD (6%) depois de realizada eletrólise de 4 horas, enquanto que 1000 ciclos voltamétricos deixaram a superfície praticamente inalterada. Os estudos realizados mostram que as atividades satisfatórias dos eletrodos preparados pelo método Sol-Gel podem constituir ferramentas interessantes de pesquisa, visando principalmente a utilização destes materiais em aplicações práticas.Continuing previous investigations, direct surface modifications of boron-doped diamond (BDD) electrodes with metal oxides (PtO x , RuO 2 , IrO 2 and PbO 2 ) and with some mixed composites were carried out by the Sol-Gel technique. The materials were studied by atomic force microscopy (AFM) to determine their surface topologies and by electrochemical techniques to establish the catalytic activity towards the oxygen evolution reaction (OER) and also, for the PtO x and PtO xRuO 2 composites, the ethanol oxidation reactions in acid media. The stability of PtO x coating covered by a Nafion ® film was also tested by long-term operation. The AFM results indicated sites of heterogeneous deposition and the electrochemical studies demonstrated that the active surface area changed considerably with the proposed method of modification. The IrO 2 /BDD electrode showed the best performance to the OER with the onset of the oxidation current at ~1.4 V, a value 200 mV lower than for the PtO x /BDD electrode. The enhanced stability of PtO x /BDD electrodes achieved by the application of a Nafion ® film and already reported in acid media was further proved using the ethanol oxidation reaction. Only a small loss of activity (6%) was observed after 4-hours electrolysis while one-thousand voltammetric cycles left the surface practically unchanged. In addition, preliminary studies for the same reaction on PtO x /BDD and PtO x -RuO 2 / BDD electrodes demonstrated the excell...

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Section: Resultssupporting

confidence: 72%

AFM studies and electrochemical characterization of boron-doped diamond surfaces modified with metal oxides by the Sol-Gel method

Suffredini¹,

Salazar‐Banda²,

Okamura³

et al. 2006

J. Braz. Chem. Soc.

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“…37 For electrodeposited catalyst electrodes, a literature method was used to electrodeposit IrO 2 . 38 An aqueous electrodeposition bath of 20 mM oxalic acid and 4 mM K 3 IrCl 6 was adjusted to pH 10 with Na 2 CO 3 and aged for >10 days. 38 IrO 2 was then anodically electrodeposited (with a Ag/AgCl reference and a fritted Pt gauze counter electrode) onto B1 cm 2 of WO 3 on FTO at 0.85 V vs. Ag/AgCl until 400 mC of charge had passed.…”

Section: Catalyst Depositionmentioning

confidence: 99%

“…38 An aqueous electrodeposition bath of 20 mM oxalic acid and 4 mM K 3 IrCl 6 was adjusted to pH 10 with Na 2 CO 3 and aged for >10 days. 38 IrO 2 was then anodically electrodeposited (with a Ag/AgCl reference and a fritted Pt gauze counter electrode) onto B1 cm 2 of WO 3 on FTO at 0.85 V vs. Ag/AgCl until 400 mC of charge had passed. The potential was selected to provide B300 mA cm À2 on FTO, the same current density as the published method.…”

Section: Catalyst Depositionmentioning

confidence: 99%

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Improving O2 production of WO3 photoanodes with IrO2 in acidic aqueous electrolyte

Spurgeon

Velázquez

McDowell

2014

Phys. Chem. Chem. Phys.

101

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WO 3 is a promising candidate for a photoanode material in an acidic electrolyte, in which it is more stable than most metal oxides, but kinetic limitations combined with the large driving force available in the WO 3 valence band for water oxidation make competing reactions such as the oxidation of the acid counterion a more favorable reaction. The incorporation of an oxygen evolving catalyst (OEC) on the WO 3 surface can improve the kinetics for water oxidation and increase the branching ratio for O 2 production. Ir-based OECs were attached to WO 3 photoanodes by a variety of methods including sintering from metal salts, sputtering, drop-casting of particles, and electrodeposition to analyze how attachment strategies can affect photoelectrochemical oxygen production at WO 3 photoanodes in 1 M H 2 SO 4 . High surface coverage of catalyst on the semiconductor was necessary to ensure that most minority-carrier holes contributed to water oxidation through an active catalyst site rather than a sidereaction through the WO 3 /electrolyte interface. Sputtering of IrO 2 layers on WO 3 did not detrimentally affect the energy-conversion behavior of the photoanode and improved the O 2 yield at 1.2 V vs. RHE from B0% for bare WO 3 to 50-70% for a thin, optically transparent catalyst layer to nearly 100% for thick, opaque catalyst layers. Measurements with a fast one-electron redox couple indicated ohmic behavior at the IrO 2 /WO 3 junction, which provided a shunt pathway for electrocatalytic IrO 2 behavior with the WO 3 photoanode under reverse bias. Although other OECs were tested, only IrO 2 displayed extended stability under the anodic operating conditions in acid as determined by XPS.

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“…[1][2][3][4] In our previous studies, we prepared IrO 2 nanoparticle-and colloid-coated electrodes by electrodeposition and self-assembly which revealed high catalytic-activity for water electrolysis. [5][6][7] However, although RuO 2 and IrO 2 are the high-active catalyst, their noble metals are rare materials on earth and are not suitable for use on a very large scale. Therefore, it is important to develop other oxide catalysts using more abundant transition metals.…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic activity of electrodeposited cobalt oxide films to produce oxygen gas from water

Nishizawa

Nakamura

Ikeda

et al. 2015

Journal of Electroanalytical Chemistry

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An electrocatalytic cobalt oxide film for water oxidation was prepared on an indium tin oxide (ITO)-coated substrate by anodic electrodeposition. Atomic force microscopy measurements revealed that numerous particles with a diameter of 100-250 nm were uniformly dispersed on the ITO substrate and the particle size increased when prepared at higher temperature. Cyclic voltammograms of the Co oxide-coated ITO electrodes were measured in alkaline and neutral aqueous solutions to examine their redox characteristics and ability to catalyze water oxidation.When Co oxide was electrodeposited from solutions kept at 10, 25 and 50 °C, the amount of electroactive Co oxide per unit area (Γ ea ) was 1.06×10 -8 , 1.72×10 -8 , and 2.31×10 -8 mol cm -2 , respectively. The increase in Γ ea accompanied the increase in particle size observed with rising deposition temperature. Quantitative analyses of O 2 gas produced by water electrolysis were carried out under potentiostatic conditions using these Co oxide-modified electrodes and a bare ITO electrode for comparison. For the Co oxide-coated electrode prepared at 10 °C, the amount of O 2 evolved by electrolysis for 2 h at 1.3 V vs. Ag/AgCl was 1.3×10 -5 mol cm -2 in alkaline electrolyte solution and 1.52×10 -5 mol cm -2 in neutral electrolyte solution containing phosphate ions. In addition, when the Co oxide-coated electrode treated at 450 °C was used, the amount of O 2 evolved by the electrolysis increased to 2.58×10 -5 mol cm -2 in the neutral electrolyte solution containing phosphate ions, resulting from a stable catalytic current.

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Remarkably high activity of electrodeposited IrO2 film for electrocatalytic water oxidation

Cited by 125 publications

References 17 publications

AFM studies and electrochemical characterization of boron-doped diamond surfaces modified with metal oxides by the Sol-Gel method

AFM studies and electrochemical characterization of boron-doped diamond surfaces modified with metal oxides by the Sol-Gel method

Improving O2 production of WO3 photoanodes with IrO2 in acidic aqueous electrolyte

Electrocatalytic activity of electrodeposited cobalt oxide films to produce oxygen gas from water

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