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79101 |
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|a La O', Gerardo Jose Cordova
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|a Massachusetts Institute of Technology. Department of Mechanical Engineering
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|a Massachusetts Institute of Technology. Electrochemical Energy Laboratory
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|a La O', Gerardo Jose Cordova
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|a Shao-Horn, Yang
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|a Shao-Horn, Yang
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|a Thickness Dependence of Oxygen Reduction Reaction Kinetics on Strontium-Substituted Lanthanum Manganese Perovskite Thin-Film Microelectrodes
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|b Electrochemical Society,
|c 2013-06-13T19:51:24Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/79101
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|a Oxygen reduction reaction (ORR) kinetics was investigated on dense La₀.₈Sr₀.₂MnO₃ microelectrodes as a function of temperature and microelectrode thickness using electrochemical impedance spectroscopy. The surface oxygen exchange and mixed bulk/three-phase-boundary (TPB) charge transfer process were found to control ORR kinetics at high and low temperatures, respectively. The transition temperature from the mixed bulk/TPB charge transfer control to surface oxygen exchange was found to be highly dependent on the microelectrode thickness (~600degrees C for 65 nm vs ~800degreesC for 705 nm). These findings can be used to guide the design of electrodes that can operate at intermediate temperatures.
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|a National Science Foundation (U.S.) (Materials Research Science and Engineering Center (MRSEC) Program, Award DMR-0819762)
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|a National Science Foundation (U.S.) (NSF grant no. CBET-0844526)
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|a en_US
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|a Article
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|t Electrochemical and Solid-State Letters
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