Journal Article10.1007/BF01023815
Oxygen reduction on Ru-oxide pyrochlores bonded to a proton-exchange membrane
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TL;DR: In this article, the performance of a gas-fed, porous, ruthenium-pyrochlore electrode attached to a Dow Developmental Fuel Cell Membrane was measured in solutions of various pH.
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Abstract: Oxygen reduction at a gas-fed, porous, ruthenium-pyrochlore electrode attached to a Dow Developmental Fuel Cell Membrane was measured in solutions of various pH. Electrode assemblies containing high surface area Pb2Ru2−xPbxO7−y or Bi2Ru2−xBixO7−y with different amounts of Teflon content with/without the incorporation of Dow gel in the active part of the electrode with/without a CO2-treated Vulcan XC-72 carbon substrate were tested. The oxide pyrochlores were found to be chemically stable and to show their lowest overpotential if separated from a 2.5 M H2SO4 proton reservoir by the membrane. Interesting oxygen reduction activity at room temperature was obtained with the Pb2Ru1.74Pb0.26O7−y electrode bonded with 22% by weight Teflon and incorporating 5% by weight Dow gel. The performance of the oxides against B-site Pb concentration and a measurement of the surface charge on the particles indicate that, in this configuration, the active sites for the oxygen reduction reaction are OH− species at the O-site positions of the A2B2O6′O1−y pyrochlores, especially the bridging oxygen with one Ru and one Pb near neighbour, i.e. Pb−Ob−Ru. Evidence that oxide particles precipitated on CO2-treated carbon transfer electrons to the substrate is also presented.
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Citations
Thermodynamic Guidelines for the Design of Bimetallic Catalysts for Oxygen Electroreduction and Rapid Screening by Scanning Electrochemical Microscopy. M-Co (M: Pd, Ag, Au)
TL;DR: Using the SECM technique, combinations of metals with enhanced electrocatalytic activities when compared with the constituent, pure metals are identified and addition of Co to Pd, Au, and Ag clearly decreases the ORR overpotential, in agreement with the proposed model.
608
An O2 cathode for rechargeable lithium batteries: The effect of a catalyst
TL;DR: In this article, the authors explore the influence of the catalysts on the performance of a nonaqueous O 2 electrode on a Li/O 2 cell and find that Co 3 O 4 gives the best compromise between initial capacity (2000 mAhg −1 ) and capacity retention (6.5% per cycle), as well as the lowest charging voltage 4 V.
603
Pd-Co-Mo electrocatalyst for the oxygen reduction reaction in proton exchange membrane fuel cells.
TL;DR: Investigation of the catalytic activity of the Pd-Co-Mo system with varying composition and heat treatment temperature reveals that a Pd:Co:Mo atomic ratio of 70:20:10 with a heat treatmentTemperature of 500 degrees C exhibits the highest catalysttic activity.
186
Comparison of Pd-Co-Au electrocatalysts prepared by conventional borohydride and microemulsion methods for oxygen reduction in fuel cells
TL;DR: In this article, a single phase Pd-Co-Au/C catalysts synthesized by the conventional borohydride reduction method and reverse microemulsion method followed by heat treatment at 500-900°C in a reducing atmosphere have been characterized by X-ray diffraction, transmission electron microscopy, and polarization measurements for oxygen reduction reaction (ORR) in proton exchange membrane fuels cells.
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Electrocatalytic oxidation and trace detection of amitrole using a Nafion/lead-ruthenium oxide pyrochlore chemically modified electrode
TL;DR: In this article, the Nafion/lead-ruthenium oxide pyrochlore (Pb 2 Ru 1.75 Pb 0.25 O 7− y ) chemically modified electrode (CME) exhibits an excellent electrocatalytic response towards the amitrole oxidation.
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References
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904
The surface chemistry of hydrous manganese dioxide
James W. Murray
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TL;DR: An experimental investigation has shown that H+ and OH− are potential determining ions for the δMnO2 surface The pH (ZPC) was determined using electrophoretic mobilities and Na+ and K+ adsorption and found to be 225 Alkalimetric titration curves failed to provide a direct determination of the pH as mentioned in this paper.
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