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Oxygen adsorption properties on a palladium promoted La1-xSrxMnO3 solid oxide fuel cell cathode

机译:钯促进的La1-xSrxMnO3固体氧化物燃料电池阴极上的氧吸附性能

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Surface reactions of O-2 molecules on a Sr-doped LaMnO3 (LSM) cathode and Pd impregnated LSM cathode are investigated by the first principles method. A tetrahedral Pd-4 cluster is used to simulate the Pd particles on the LSM surface. The calculated adsorption energies demonstrate that the pre-adsorbed Pd facilitates O-2 adsorption on the surface. The bond length of adsorbed O-2 species and corresponding dissociation energies indicate that O-2 molecules on the Pd/LSM cathode surface can be dissociated more easily than on the pure LSM surface. The pre-adsorbed Pd (atom and cluster) can serve as an active center on the surface and enhance the electron transference properties during the oxygen reduction reactions.
机译:通过第一原理方法研究了O-2分子在掺Sr的LaMnO3(LSM)阴极和Pd浸渍的LSM阴极上的表面反应。四面体Pd-4簇用于模拟LSM表面上的Pd粒子。计算得出的吸附能表明,预吸附的Pd促进了O-2在表面的吸附。吸附的O-2种类的键长和相应的离解能表明Pd / LSM阴极表面上的O-2分子比纯LSM表面上的O-2分子更容易离解。预吸附的Pd(原子和簇)可以充当表面上的活性中心,并在氧还原反应过程中增强电子传输性能。

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