| The aluminum-air battery is brand-new chemical power source with abundance in nature, low price, high energy density and long life. The aluminum air battery with simulated seawater as electrolyte, has promised application in lantern pharos and submarine. However, serious polarization and poor stability of air cathode limited the further application of aluminum-air battery.In this paper, the perovkite type oxide LaCoO3 as a catalyst for oxygen reduction was prepared by sol-gel method. The temperature of calcining dry gel was determined by TG. The effects of solvent, doping lever of CaNO3, addition level of citric acid were studied by XRD spectrum analysis and IR specrum analysis. The adsorption property of catalyst was chracterzed by surface analysis.The preparation of LaCoO3 was optimized by orthogonal experimental. The results show that the size of catalyst is about 200nm and the surface area of catalyst is 63.59m2/g when using ethylene glycol as solvent and the temperature of calcining dry gel at 700℃, with 0.4 Ca(NO3)2 doped and the molar ration of citrieaeid to metal lion at 2.0.We studied the content of catalyst and PTFE in active layer, the content of (NH4)2C2O4 in gas diffusion and waterpro layer by polarization curve, cyclic voltammetry, electrochemical impedance spectroscopy, electrochemical discharge curve. The results show that the ctive layer with 20% (wt%) catalyst and PTFE has smaller polaration characteristic and stable discharge curve. We can increase the transfer rate of oxygen when the mass ratio of (NH4)2C2O4 to base material is 2:1. When the thickness of air cathode is 2mm, high voltage is gotten, the performance of air cathode is best. |
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