Evaluation of the Oxygen Reduction Activities of Rare-Earth Oxide-supported Silver Catalysts Using a Channel Flow Double Electrode

Itagaki, Masayuki; Fujimura, Yasuhiro; Shitanda, Isao; Watanabe, Kunihiro; Hachiya, Toshinori

doi:10.2116/analsci.22.1315

Cited by 4 publications

(4 citation statements)

References 13 publications

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“…Preparation of the catalyst 12 Carbon black (2 g, Mitsubishi Chemical, KETJENBLACK EC-600JD), which was ground to powder by a mill (Janke & Kukel, A10), was dispersed in a 200-cm 3 aqueous solution containing 3.15 g silver nitrate. The solution was stirred for 15 min with a magnetic stirrer, and was evaporated to dryness at 100 C in an oven.…”

Section: Methodsmentioning

confidence: 99%

“…12 Oxygen is reduced to hydrogen peroxide by 2-electron reduction on the Ag surface. Hydrogen peroxide generated chemically decomposes to oxygen and water on the CeO2 surface by the disproportionation reaction.…”

Section: Permeability Of Hydrogen Peroxide For Pdms Filmmentioning

confidence: 99%

“…Recently, the authors prepared a cerium oxide-supported silver (CeO2/Ag) catalyst, and reported that quasi-4 electron reduction occurs on the CeO2/Ag surface. 12 The CeO2/Ag catalyst retains a high oxygen reduction activity, and is stable under the oxidative and high alkaline conditions. Here, the authors used the CeO2/Ag catalyst for the present screen-printed dissolved oxygen sensor.…”

Section: Introductionmentioning

confidence: 99%

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Screen-printed Dissolved Oxygen Sensor Based on Cerium Oxide-supported Silver Catalyst and Polydimethylsiloxane Film

2011

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Section: Methodsmentioning

confidence: 99%

Section: Permeability Of Hydrogen Peroxide For Pdms Filmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Screen-printed Dissolved Oxygen Sensor Based on Cerium Oxide-supported Silver Catalyst and Polydimethylsiloxane Film

2011

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“…The inert electrodes are used to study the oxygen reduction mechanism, and one of the by-products of this reaction is H 2 O 2 . Traditionally, a rotating ring disk electrode [5][6][7][8] or a channel flow double electrode [9][10][11] is used to detect H 2 O 2 from the oxygen reduction reaction; however, these cannot be used to detect H 2 O 2 in biofilms growing on electrodes. Biofilms growing cathodically on polarized surfaces, or cathodic biofilms (biocathodes), can reduce oxygen during their growth phase [12,13].…”

Section: Introductionmentioning

confidence: 99%

A hydrogen peroxide microelectrode to use in bioelectrochemical systems

Atçı

Babauta

Beyenal

2016

Sensors and Actuators B: Chemical

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Polarized electrodes are used in bioelectrochemical systems (BES) in which the electrodes are used to grow biofilms or remove biofilms. In either case H O 2 is generated as an intermittent product of oxygen reduction. Traditionally, a H 2 O 2 microelectrode (HPM) consists of a sealed platinum wire with a tip a few µm in diameter. This microelectrode is connected to an external reference electrode (which is also used as the counter electrode) and polarized to +0.8 V Ag/AgCl to measure H 2 O 2 concentration. This traditional H 2 O 2 microelectrode (tHPM) works well for measuring H 2 O 2 concentrations in biofilms growing on non-polarized surfaces. It is a common misconception that this tHPM will work correctly in an electric field. We observed experimentally that the tHPM produces artifacts in measurements when it is used in BES. This has not been noticed before. These undesired effects needed to be resolved before H 2 O 2 concentration could be measured in BES. The goals of this work were to 1) describe the artifacts related to the use of tHPM in BES, 2) develop a H 2 O 2 microelectrode which does not suffer from these artifacts, 3) verify the operation of the new microelectrode in BES, and 4) improve the sensitivity of the microelectrode. In this work, we built an all-in-one HPM (aHPM) in which the reference electrode and the working electrode were placed a few hundred µm away from each other in a sealed configuration. We verified that our aHPM, unlike the tHPM, is not affected by an interfering electric field and generates reproducible, correct measurements in BES. We compared H 2 O 2 flux measurements from the electrode in a BES with depth profiles measured using aHPM and tHPM to identify artifacts and reliability. Finally, after proving the reliability of the aHPM in BES, we improved its sensitivity. The aHPM demonstrated a linear calibration in the range of 0.87 M to 166.8 M H 2 O 2 concentration with a 1.69-M limit of detection (S/N = 2). Although our goal was to develop an HPM which can operate in an electric field, the developed microelectrode can be used in many other applications requiring M resolution.

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Microelectrode-based hydrogen peroxide detection during oxygen reduction at Pt disk electrode

Kishi

Fukasawa

Umeda

2010

Journal of Power Sources

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Evaluation of the Oxygen Reduction Activities of Rare-Earth Oxide-supported Silver Catalysts Using a Channel Flow Double Electrode

Cited by 4 publications

References 13 publications

Screen-printed Dissolved Oxygen Sensor Based on Cerium Oxide-supported Silver Catalyst and Polydimethylsiloxane Film

Screen-printed Dissolved Oxygen Sensor Based on Cerium Oxide-supported Silver Catalyst and Polydimethylsiloxane Film

A hydrogen peroxide microelectrode to use in bioelectrochemical systems

Microelectrode-based hydrogen peroxide detection during oxygen reduction at Pt disk electrode

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