An IrSi oxide film as a highly active water-oxidation catalyst in acidic media

Tran, Viet Ha; Yatabe, Takeshi; Matsumoto, Takahiro; Nakai, Hidetaka; Suzuki, Kazuharu; Enomoto, Takao; Hibino, Takashi; Kaneko, Kenji; Ogo, Seiji

doi:10.1039/c5cc04286k

Cited by 18 publications

(13 citation statements)

References 41 publications

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“…Recently,T ran et al proposed away for reducing the iridium content by doping oxide films with silicon, rendering av ery high TOFfor OER. [17] One of the major reasons for the slow progress in finding improved catalysts for OER electrocatalysis is that the selection of these materials has been guided mainly by theoretical-based approaches such as ab-initio density functional theory (DFT) calculations. [18,19] This seems to become ac ritical issue in electrochemistry, [20] and while theoretical approaches are an important and powerful tool, synthesis steps with atrial and error route are indispensable to achieve better catalysts for industrial PEM electrolyzers.Nonetheless, ap urely theoretical approach will enhance the catalyst development in atimely manner.…”

Section: Thetotalglobalhydrogenproductionvalueisgreaterthan30mentioning

confidence: 99%

Nanosized IrO_x–Ir Catalyst with Relevant Activity for Anodes of Proton Exchange Membrane Electrolysis Produced by a Cost‐Effective Procedure

et al. 2015

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Abstract:We have developed ah ighly active nanostructured iridium catalyst for anodes of proton exchange membrane (PEM) electrolysis.C lusters of nanosized crystallites are obtained by reducing surfactant-stabilized IrCl 3 in water-free conditions.T he catalyst shows af ive-fold higher activity towards oxygen evolution reaction (OER) than commercial Ir-black. The improved kinetics of the catalyst are reflected in the high performance of the PEM electrolyzer (1 mg Ir cm À2 ), showing an unparalleled low overpotential and negligible degradation. Our results demonstrate that this enhancement cannot be only attributed to increased surface area, but rather to the ligand effect and low coordinate sites resulting in ahigh turnover frequency (TOF). The catalyst developed herein sets ab enchmark and as trategy for the development of ultra-low loading catalyst layers for PEM electrolysis.

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Section: Thetotalglobalhydrogenproductionvalueisgreaterthan30mentioning

confidence: 99%

Nanosized IrO_x–Ir Catalyst with Relevant Activity for Anodes of Proton Exchange Membrane Electrolysis Produced by a Cost‐Effective Procedure

et al. 2015

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“…S2). This is probably related to both the catalytic activity of IrO 2 for the water vapor oxidation reaction [10][11][12] and its proton exchange ability. [14][15][16] Another important result in the CV profiles is that the current increased almost linearly with the voltage, regardless of the presence or absence of PM (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…First, we grew a thin, dense Zr 1-x Y x P 2 O 7 film on the surface of a BaZr 0.8 Y 0.2 O 3-δ ceramic substrate, which provides a good balance between withstanding voltage and proton conductivity. We next added IrO 2 or RuO 2 , both of which are known electrocatalysts for water oxidation, [10][11][12][13] with a Pt working electrode. Since these metal oxides also have excellent proton exchange ability, 14-16 a three-dimensional network of protons was expected to form within the working electrode.…”

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confidence: 99%

A Sensitive and Self-Regenerable Particulate Matter Sensor with a H₃PO₄-Modified BaZr_0.8Y_0.2O_3-δElectrolyte and an IrO₂-Catalyzed Sensing Electrode

Oogushi

Nakashima

et al. 2016

J. Electrochem. Soc.

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There have been many attempts to develop solid-state sensor devices for detecting particulate matter (PM) in diesel exhaust; however, in most of these, the accumulated PM must be burned intermittently to allow subsequent sensing cycles. Here, we report a selfregenerable PM sensor using a proton conductive solid electrolyte and an active working electrode for PM oxidation. The withstanding voltage capability of BaZr 0.8 Y 0.2 O 3-δ was greatly improved by the growth of a dense Zr 1-x Y x P 2 O 7 film on the electrolyte surface. The reaction of PM with active oxygen under anodic polarization was further enhanced by the addition of IrO 2 to the working electrode. As a result of these combined modifications, when the working electrode was anodically polarized, PM was oxidized to CO 2 according to a four-electron reaction (C + 2H 2 O → CO 2 + 4H + + 4e -) while remaining below the self-ignition temperature. This amperometric sensor successfully produced a current signal corresponding to the quantity of PM in a gas stream at an operating temperature of 300 • C. These results demonstrate that the sensor can carry out continuous monitoring of PM concentrations while self-regenerating.

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“…36,37 These materials have also been shown to represent important replacements for platinum in electrolysis and fuel cells. 34,38 We conducted preliminary tests using these commercially available materials as cathode materials for RFCBs and found that RuO 2 showed a higher cathode performance than IrO 2 . Subsequently, nanocrystalline RuO 2 was synthesized from RuCl 3 in our own laboratory and compared to the commercial RuO 2 with respect to nanostructure and catalytic activity.…”

Section: Resultsmentioning

confidence: 99%

“…It is also reasonable to conclude that the current collection ability of the electrode is enhanced, contributing to the decrease in the polarization resistance. 34 The galvanostatic discharge profiles of cells using the above MPCs as anodes were obtained by charging to 1.0 V with a current density of 10 mA cm −2 at room temperature ( Fig. 2c and Fig.…”

Section: Resultsmentioning

confidence: 99%

Design of a Rechargeable Fuel-Cell Battery with Enhanced Performance and Cyclability

Hibino

Kobayashi

Nagao

et al. 2016

J. Electrochem. Soc.

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Electrochemical devices integrating a fuel cell with a hydrogen storage medium are able to function as secondary batteries. Batteries incorporating a partially oxygenated carbon anode with a RuO 2 /C cathode exhibit excellent reversibility, but their performance is not yet sufficient for secondary battery applications. This is due to excessive oxygenation of the anode, degradation of the cathode and the excess weight of the electrolyte membrane. In the present work, we addressed these challenges through various improvements in the design of a rechargeable proton-exchange membrane battery. These included coating the surface of a significantly oxygenated carbon anode (O/C atomic ratio 0.131) with carbon black nanoparticles, nanocrystallization of a carbon-free RuO 2 cathode (avg. crystallite size 1.1 nm) and the synthesis of an inorganic-organic composite electrolyte membrane. As a result of these optimizations, coulombic efficiencies of over 95% were achieved during charge/discharge over the voltage range of 0.0-1.5 V at 75 • C. The resulting device exhibited an initial capacity of 330 mAh g −1 and was stable over 300 cycles, with maximum energy and power densities of Hydrogen is a promising medium for the storage and supply of electricity through water-electrolysis/fuel-cell operation.1,2 The primary application of hydrogen in this context would be to store surplus power when the quantity of electricity produced by natural energy sources exceeds that required by a consumer.3-5 Rechargeable fuel cells capable of operating alternately in electrolyzer and fuel cell modes are recognized as the optimum systems because they are smaller and more compact than conventional systems based on isolated water electrolyzer and fuel cell units.6-8 The key technology necessary for such devices is hydrogen storage, which is currently accomplished via liquefaction and compression of the gas or by the physical or chemical adsorption of hydrogen atoms or molecules in/on materials such as metal or organic chemical hydrides.9,10 However, an energy input is required for these processes that in turn increases the overall cost. Furthermore, the hydrogen tanks and lines employed in such systems negatively impact their volumetric energy density.To mitigate these problems, rechargeable fuel-cell batteries (RFCBs) containing a hydrogen storage medium have been proposed. [11][12][13] During the operation of such batteries, hydrogen production, storage, supply and utilization processes must be conducted at the anode under the standard operational conditions of the cell, such as between room temperature and 80• C and at ambient pressure. In this context, oxygen-functionalized microporous carbons (MPCs) are promising hydrogen storage media, due to their excellent reversibility. 13 The redox pair between carbonyl (C=O) and phenol (C-OH) groups is one of the most important hydrogen carrier sites in such carbon anodes. The origin of this redox reaction is ascribed to the following equilibrium reaction between the two functional groups.This reaction...

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An IrSi oxide film as a highly active water-oxidation catalyst in acidic media

Cited by 18 publications

References 41 publications

Nanosized IrO_x–Ir Catalyst with Relevant Activity for Anodes of Proton Exchange Membrane Electrolysis Produced by a Cost‐Effective Procedure

Nanosized IrO_x–Ir Catalyst with Relevant Activity for Anodes of Proton Exchange Membrane Electrolysis Produced by a Cost‐Effective Procedure

A Sensitive and Self-Regenerable Particulate Matter Sensor with a H₃PO₄-Modified BaZr_0.8Y_0.2O_3-δElectrolyte and an IrO₂-Catalyzed Sensing Electrode

Design of a Rechargeable Fuel-Cell Battery with Enhanced Performance and Cyclability

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An IrSi oxide film as a highly active water-oxidation catalyst in acidic media

Cited by 18 publications

References 41 publications

Nanosized IrOx–Ir Catalyst with Relevant Activity for Anodes of Proton Exchange Membrane Electrolysis Produced by a Cost‐Effective Procedure

Nanosized IrOx–Ir Catalyst with Relevant Activity for Anodes of Proton Exchange Membrane Electrolysis Produced by a Cost‐Effective Procedure

A Sensitive and Self-Regenerable Particulate Matter Sensor with a H3PO4-Modified BaZr0.8Y0.2O3-δElectrolyte and an IrO2-Catalyzed Sensing Electrode

Design of a Rechargeable Fuel-Cell Battery with Enhanced Performance and Cyclability

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Nanosized IrO_x–Ir Catalyst with Relevant Activity for Anodes of Proton Exchange Membrane Electrolysis Produced by a Cost‐Effective Procedure

Nanosized IrO_x–Ir Catalyst with Relevant Activity for Anodes of Proton Exchange Membrane Electrolysis Produced by a Cost‐Effective Procedure

A Sensitive and Self-Regenerable Particulate Matter Sensor with a H₃PO₄-Modified BaZr_0.8Y_0.2O_3-δElectrolyte and an IrO₂-Catalyzed Sensing Electrode