Abstract
A Co1.5Mn1.5O4-Ce0.8Sm0.2O1.9 (CMO-SDC) composite material has been prepared by the one-step hydrothermal synthesis method. The phase structure and morphology of the polycrystalline powders have been characterized by X-ray powder diffraction (XRD), Scanning Electron Microscopy (SEM). The results show the coexistence of the spinel and the fluorite-type structure which is uniformly distributed throughout the prepared samples. The fluorite phase SDC is well compatible with the spinel phase CMO. This proposed CMO-SDC composite cathode is successfully assembled with a traditional yttria stabilized zirconia (YSZ) electrolyte to fabricate intermediate temperature solid oxide fuel cells (IT-SOFCs) with the structure Ni–YSZ|YSZ|CMO-SDC. The CMO-SDC (50:50wt%) cell with the YSZ film of ~60µm in thickness achieve power densities of 932 and 646mWcm-2 at 800 and 750℃, respectively, in humidified H2 (3vol%H2O), demonstrating its promising application in IT-SOFCs. The high performance is attributed to the intimate contacts between CMO and SDC nanoparticles in the three-phase boundaries in the cathode.
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