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Sci Rep ; 2: 462, 2012.
Article in English | MEDLINE | ID: mdl-22708057

ABSTRACT

Tremendous efforts to develop high-efficiency reduced-temperature (≤ 600°C) solid oxide fuel cells are motivated by their potentials for reduced materials cost, less engineering challenge, and better performance durability. A key obstacle to such fuel cells arises from sluggish oxygen reduction reaction kinetics on the cathodes. Here we reported that an oxide hybrid, featuring a nanoporous Sm(0.5)Sr(0.5)CoO(3-δ) (SSC) catalyst coating bonded onto the internal surface of a high-porosity La(0.9)Sr(0.1)Ga(0.8)Mg(0.2)O(3-δ) (LSGM) backbone, exhibited superior catalytic activity for oxygen reduction reactions and thereby yielded low interfacial resistances in air, e.g., 0.021 Ω cm(2) at 650°C and 0.043 Ω cm(2) at 600°C. We further demonstrated that such a micro-nano porous hybrid, adopted as the cathode in a thin LSGM electrolyte fuel cell, produced impressive power densities of 2.02 W cm(-2) at 650°C and 1.46 W cm(-2) at 600°C when operated on humidified hydrogen fuel and air oxidant.


Subject(s)
Electric Power Supplies , Nanostructures/chemistry , Oxides/chemistry , Oxygen/chemistry , Catalysis , Cobalt/chemistry , Electric Conductivity , Electrochemistry/instrumentation , Electrochemistry/methods , Electrodes , Electrolytes/chemistry , Gallium/chemistry , Lanthanum/chemistry , Magnesium/chemistry , Microscopy, Electron, Scanning , Nanopores/ultrastructure , Nanostructures/ultrastructure , Oxidation-Reduction , Porosity , Reproducibility of Results , Samarium/chemistry , Strontium/chemistry , Temperature
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