Aluminum / Air Battery Cathode And The Catalyst Research

The development and problems at present of Aluminum/air fuel cell, air electrode and air electrode catalyst are introduced. The effect of carbon base materials, PTFE content and press pressure on performance of air electrode are studied by Tafel curves. The surface morphologies of air electrode are examined using SEM. The preparation conditions of perovskite, LaCoO3 and LaMnO3 are investigated. The effects of elements substitute on A site of perovskite on structure are also studied by XRD. Polarization and discharge curves under a 200 mA/cm2 current density are measured to evaluate the catalytic performance of electrocatalysts. Porphyrin and metal porphyrin are synthesized and characterized using IR spectrum and XPS. The effect of heat treatment at different temperature on structure and catalytic activity of metal porphyrin are investigated by XPS, polarization and discharge curves respectively.Results show the performance of air electrode using active carbon as base material is better than that using acetylene black. Air electrode with 25% PTFE in active layer using active carbon base material, 60% PTFE in diffusion layer using acetylene black base material and compressed under 15MPa show the best performance.perovskite are prefabricated using malic acid and metal salt to form precursor. Then the precursor is calcined in air at 600 ℃ for 2h. Ca and Sr substitute on perovskite don't change crystal structure. Ca substitute on LaCoO3 result in lattice distortion and grain refinement. La0.6Ca0.4CoO3 which contain the least, im- purity shows the best catalytic activity. Sr substitute on LaMnOa result in unit cell parameters augment and coarse-grain.La0.8Sr0.2MnO3 show the best catalytic activity.Using acid (Pka=2.0~4.0) as catalyst, strong polarity solvent and reacting under 200℃ are found to yield more porphyrin. The moiety M-N4 of metal porphyrin isn't destroyed under 600℃ heat treatment but destroyed partly under 800℃. Thus the catalytic activity of metal porphyrin heat treated under 600# is better than that heat treated under 800#.