Catalytic Activity of Nanosized Ruthenium Oxide-Coated Titanium Anodes Prepared by Thermal Decomposition for Oxygen Evolution in Sulfuric Acid Solutions

Kawaguchi, Kenji; Kimura, Shuhei; Morimitsu, Masatsugu

doi:10.1007/s12678-020-00610-1

Cited by 8 publications

(8 citation statements)

References 24 publications

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“…Here, the calculated Tafel slopes equal to 118, 59, 40, 24, and 17 mV dec –1 imply that the rate-limiting step is S1, S2, S3, S4, and S5, respectively. − The Tafel slope of the IrO 2 –Ta 2 O 5 /Ti felt(350)–PEG was 41.2 mV dec –1 , suggesting that S3 is the rate-limiting step. The Tafel slope increased at temperatures above 350 °C (Figure d).…”

Section: Resultsmentioning

confidence: 80%

Structure–Stability Relationship of Amorphous IrO₂–Ta₂O₅ Electrocatalysts on Ti Felt for Oxygen Evolution in Sulfuric Acid

et al. 2022

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A mixed layer of IrO2 and Ta2O5 deposited on a Ti substrate is an effective electrode for the catalysis of oxygen evolution reactions (OERs) in acidic solutions. In our previous work, IrO2–Ta2O5 catalysts supported on Ti fibers exhibited an amorphous structure, a large electrochemically active surface area (ECSA), and a high stability in acidic media. However, the local structure of amorphous OER electrocatalysts has not been studied extensively. In this study, the properties of an amorphous IrO2–Ta2O5 layer were analyzed through X-ray absorption spectroscopy (XAS) to understand the factors that contribute to its high OER stability. Herein, the addition of polyethylene glycol (PEG) to a precursor composed of H2IrCl6 and TaCl5 resulted in the formation of IrO2 nanoparticles with low chlorine residues even after thermal decomposition at a low temperature of 350 °C. X-ray diffraction and Raman spectroscopy results showed that the synthesized IrO2 nanoparticles were amorphous. However, from the XAS results, the local [IrO6] octahedron structure, which is similar to that of rutile IrO2 crystals, was revealed. During the preparation process, PEG assisted a complete ligand exchange from the [IrCl6] octahedron to the [IrO6] octahedron. This local structure of the IrO2 nanoparticles makes the amorphous IrO2–Ta2O5 layer on the Ti fibers stable during OER in acidic media. Furthermore, sintering is unlikely to occur during the synthesis because of the low thermal decomposition temperature of the precursor. As such, the synthesized amorphous IrO2 nanoparticles exhibited a large ECSA. In addition, the high intrinsic activity of the [IrO6] local structure resulted in a small Tafel slope. Thus, the amorphous IrO2 nanoparticles with an [IrO6] local structure are essential not only to achieve high activity but also high stability during the OER.

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Section: Resultsmentioning

confidence: 80%

Structure–Stability Relationship of Amorphous IrO₂–Ta₂O₅ Electrocatalysts on Ti Felt for Oxygen Evolution in Sulfuric Acid

et al. 2022

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“…Kawaguchi et al 44 prepared a RuO 2 /Ti anode. First, the Ti substrate with dimensions of 10 mm × 50 mm × 1 mm was pretreated, degreased with acetone, etched with 10 wt% oxalic acid solution at 90 °C for 60 min, cleaned with distilled water, and dried.…”

Section: Environmental Science: Water Research and Technologymentioning

confidence: 99%

Treatment of organic matter and ammonia nitrogen in wastewater by electrocatalytic oxidation: a review of anode material preparation

Jing

Yang

et al. 2022

Environ. Sci.: Water Res. Technol.

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“…The nanotwins could not be ignored when investigating the OER reaction mechanism . However, although nanotwins have been found as low-energy planar defects in the experimental work, − they have rarely been studied theoretically because of their complexity.…”

Section: Introductionmentioning

confidence: 99%

V-Shaped RuO₂ Nanotwin Complex Defect Facilitation of OER Reaction

Zhao

Tang

2023

J. Phys. Chem. C

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RuO2 is one of the most active catalysts for the acidic oxygen evolution reaction (OER). As a first step in understanding the mechanism for V-shaped RuO2 nanotwin facilitation of the OER reaction, the relaxed atomic configuration and detailed partial density of states are determined using density-functional theory and are shown to dictate an upward shift of d- and p-band centers. The RuO2 101-nanotwin grain boundary (101-TGB), as the first ∑101 V-shaped structure constructed, reduces the distance between kinked Ru and its surrounding O atoms, which enhances p–d hybridization. The special structure properly regulates the value of ΔG *O–ΔG *OH and charge-transfer energy. In addition, with the introduction of transition-metal and oxygen vacancies, the degree of nanotwin dislocation increases, exhibiting positive effects on the improvement of surface catalytic activity. Regulating the synergistic effect of nanotwins and transition metals can thus be crucial in assisting the exploration of new, multiple, and excellent RuO2-based nanocatalyst materials.

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Catalytic Activity of Nanosized Ruthenium Oxide-Coated Titanium Anodes Prepared by Thermal Decomposition for Oxygen Evolution in Sulfuric Acid Solutions

Cited by 8 publications

References 24 publications

Structure–Stability Relationship of Amorphous IrO₂–Ta₂O₅ Electrocatalysts on Ti Felt for Oxygen Evolution in Sulfuric Acid

Structure–Stability Relationship of Amorphous IrO₂–Ta₂O₅ Electrocatalysts on Ti Felt for Oxygen Evolution in Sulfuric Acid

Treatment of organic matter and ammonia nitrogen in wastewater by electrocatalytic oxidation: a review of anode material preparation

V-Shaped RuO₂ Nanotwin Complex Defect Facilitation of OER Reaction

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Catalytic Activity of Nanosized Ruthenium Oxide-Coated Titanium Anodes Prepared by Thermal Decomposition for Oxygen Evolution in Sulfuric Acid Solutions

Cited by 8 publications

References 24 publications

Structure–Stability Relationship of Amorphous IrO2–Ta2O5 Electrocatalysts on Ti Felt for Oxygen Evolution in Sulfuric Acid

Structure–Stability Relationship of Amorphous IrO2–Ta2O5 Electrocatalysts on Ti Felt for Oxygen Evolution in Sulfuric Acid

Treatment of organic matter and ammonia nitrogen in wastewater by electrocatalytic oxidation: a review of anode material preparation

V-Shaped RuO2 Nanotwin Complex Defect Facilitation of OER Reaction

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Product

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Structure–Stability Relationship of Amorphous IrO₂–Ta₂O₅ Electrocatalysts on Ti Felt for Oxygen Evolution in Sulfuric Acid

Structure–Stability Relationship of Amorphous IrO₂–Ta₂O₅ Electrocatalysts on Ti Felt for Oxygen Evolution in Sulfuric Acid

V-Shaped RuO₂ Nanotwin Complex Defect Facilitation of OER Reaction