Evaluation of the Redox Behavior of Hydrous Ruthenium Oxides: Effect of Temperature and Acid Concentration on the Electrochemical Behavior of Layered Ruthenium Oxide

Sugimoto, Wataru; Ohta, Toshiaki; Yokoshima, Katsunori; Takasu, Yoshio

doi:10.5796/electrochemistry.75.645

Cited by 9 publications

(4 citation statements)

References 19 publications

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“…Three characteristic redox pairs are observed at ~0.1, 0.65 and 0.8 V (hereafter denoted A1/C1, A2/C2, A3/C3). A2/C2 and A3/C3 are attributed to electrosorption of anionic and cationic species, respectively [27,28]. A1/C1 is uncommon for polycrystalline RuO 2 systems but bears similarity to peaks observed in high quality RuO 2 (100) single crystal surfaces [38].…”

Section: Electrochemical Properties Of Ruo 2 Ns/cmentioning

confidence: 95%

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Enhanced activity and stability of Pt/C fuel cell anodes by the modification with ruthenium-oxide nanosheets

Saida¹,

Sugimoto²,

Takasu³

2010

Electrochimica Acta

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Ruthenium oxide nanosheet (RuO 2 ns) crystallites with thickness less than 1 nm were prepared via chemical exfoliation of a layered potassium ruthenate and deposited onto carbon supported platinum (Pt/C) as a potential co-catalyst for fuel cell anode catalysts. The electrocatalytic activity towards carbon monoxide and methanol oxidation was studied at various temperatures with for different RuO 2 ns loadings. An increase in electrocatalytic activity was evidenced at temperatures above 40°C, while little enhancement in activity was observed at room temperature. The RuO 2 ns modified Pt/C catalyst with composition of RuO 2 :Pt= 0.5:1 (molar ratio) exhibited the highest methanol oxidation activity. CO-stripping voltammetry revealed that RuO 2 ns promotes oxidation of adsorbed CO on Pt. In addition to the enhanced initial activity, the RuO 2 ns modified Pt/C catalyst exhibited improved stability compared to pristine Pt/C against consecutive potential cycling tests.

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Section: Electrochemical Properties Of Ruo 2 Ns/cmentioning

confidence: 95%

“…It is well known that crystalline RuO 2 has high electrochemical stability within the hydrogen and oxygen evolution region [23][24][25][26][27][28][29][30]. However, it has also been reported that hydrous ruthenium oxide containing Ru 3+ is not stable in acidic electrolyte [30].…”

Section: Introductionmentioning

confidence: 99%

Enhanced activity and stability of Pt/C fuel cell anodes by the modification with ruthenium-oxide nanosheets

Saida¹,

Sugimoto²,

Takasu³

2010

Electrochimica Acta

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“…Among research interest of classical thermoelectrochemistry in open cells with small T variation was the process of electropolymerisation [146,147], the large field of electrode surface layers [148][149][150][151][152][153][154][155][156][157][158][159]. Formation of oxide films or layers of adsorbed oxygen species at noble metal electrodes (Ir, Pd, Pt, Ru) or at alloy 600 (a nickel-chromium-iron alloy) has been studied in dependence on temperature [148][149][150][151].…”

Section: Kinetics and Transport Processesmentioning

confidence: 99%

In-situ Thermoelectrochemistry

Gründler

2015

Monographs in Electrochemistry

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Surprisingly, a large number of important topics in electrochemistry is not covered by up-to-date monographs and series on the market, some topics are even not covered at all. The series Monographs in Electrochemistry fills this gap by publishing indepth monographs written by experienced and distinguished electrochemists, covering both theory and applications. The focus is set on existing as well as emerging methods for researchers, engineers, and practitioners active in the many and often interdisciplinary fields, where electrochemistry plays a key role. These fields will range -among others -from analytical and environmental sciences to sensors, materials sciences and biochemical research.

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“…Oxides with tetravalent ruthenium, namely RuO 2 and RuO 2 • xH 2 O, are known to be electrochemically stable in hydrogen and oxygen evolution regions. 19,20,[63][64][65][66][67] RuO 2 not only has a stabilizing effect on Pt but also prevents degradation and Pt dissolution at the cathodes of PEFCs. 34 A tentative explanation is given by Saida et al by evoking strong acidic nature of RuO 2 .…”

Section: Resultsmentioning

confidence: 99%

A Durable RuO₂-Carbon-Supported Pt Catalyst for PEFCs: A Cause and Effect Study

Selvaganesh¹,

Selvarani²,

Sridhar³

et al. 2012

J. Electrochem. Soc.

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As Polymer Electrolyte Fuel Cells (PEFCs) are nearing the acceptable performance level for automotive and stationary applications, the focus on the research is shifting more and more toward enhancing their durability that still remains a major concern in their commercial acceptability. Hydrous ruthenium oxide (RuO 2 ) is a promising material for pseudocapacitors due to its high stability, high specific-capacitance and rapid faradaic-reaction. Incorporation of carbon-supported RuO 2 (RuO 2 /C) to platinum (Pt) is found to ameliorate both stability and catalytic activity of fuel cell cathodes that exhibit higher performance and durability in relation to Pt/C cathodes as evidenced by cell polarization, impedance and cyclic voltammetry data. The degradation in performance of Pt-RuO 2 /C cathodes is found to be only ∼8% after 10000 accelerated stress test (AST) cycles as against ∼60% for Pt/C cathodes after 7000 AST cycles under similar conditions. These data are in conformity with the Electrochemical Surface Area and impedance results. Interestingly, Pt-RuO 2 /C cathodes can withstand more than 10000 AST cycles with only a nominal loss in their performance. Studies on catalytic electrodes with X-ray diffraction, transmission electron microscopy and cross-sectional field-emission scanning electron microscopy reflect that incorporation of RuO 2 to Pt helps mitigating aggregation of Pt particles and improves its stability during long-term operation of PEFCs.

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Evaluation of the Redox Behavior of Hydrous Ruthenium Oxides: Effect of Temperature and Acid Concentration on the Electrochemical Behavior of Layered Ruthenium Oxide

Cited by 9 publications

References 19 publications

Enhanced activity and stability of Pt/C fuel cell anodes by the modification with ruthenium-oxide nanosheets

Enhanced activity and stability of Pt/C fuel cell anodes by the modification with ruthenium-oxide nanosheets

In-situ Thermoelectrochemistry

A Durable RuO₂-Carbon-Supported Pt Catalyst for PEFCs: A Cause and Effect Study

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Evaluation of the Redox Behavior of Hydrous Ruthenium Oxides: Effect of Temperature and Acid Concentration on the Electrochemical Behavior of Layered Ruthenium Oxide

Cited by 9 publications

References 19 publications

Enhanced activity and stability of Pt/C fuel cell anodes by the modification with ruthenium-oxide nanosheets

Enhanced activity and stability of Pt/C fuel cell anodes by the modification with ruthenium-oxide nanosheets

In-situ Thermoelectrochemistry

A Durable RuO2-Carbon-Supported Pt Catalyst for PEFCs: A Cause and Effect Study

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A Durable RuO₂-Carbon-Supported Pt Catalyst for PEFCs: A Cause and Effect Study