Zinc - Air Battery Catalysts And Their Performance

Zinc-air battery anode (negative) energy storage is the metal zinc as the active material, and the cathode (positive) is the oxygen in the air.Oxygen in the air, inexhaustible, yet within the space occupied by the battery, it is the same size, same weight, the this new zinc-air batteries can store more raw materials, the electrochemical reaction, phasethan traditional batteries, it is a very high specific energy (specific energy in theory, up to 1350Wh/kg, while the actual up to (200-400Wh/Kg), production costs are low.Zinc-air battery has a discharge capacity, high specific energy, low production costs, discharge performance is stable, safe, non-polluting, high-power use and readily available materials, abundant and renewable, and many other features, has become the world's energydevelopment focus areas, is a huge market potential with the chemical power supply.Zinc-Air Batteries to the implementation of industrial production, the core of the air diffusion electrode, one of the key technologies to solve the problem of its preparation.If you optimize its performance, it is expected to favor gas diffusion, and formation of more three-phase interface, the more favorable electrochemical reaction.One of the air diffusion electrode mainly composed of PTFE emulsion catalytic membrane, activated carbon, catalyst composition.PTFE emulsion content of zinc-air battery catalytic membrane electrochemical properties greatly.PTFE emulsion catalytic membrane electrochemical properties of two ways:on the one hand the PTFE emulsion is a very good electrical insulating properties of polymer materials, with the dosage increased, the electrode resistance increases, while the porous catalytic membranethe liquid layer to reduce the number of holes, the liquid resistance increases, resulting in ohmic resistance of the battery increases, the performance of the battery discharge; the other hand, PTFE emulsion, with the increase in the number of catalytic coating in the pores increases, soincreased diffusion of oxygen coming in, which can effectively reduce the gas concentration polarization, to improve the discharge capacity of the battery.The second air diffusion electrode for general use waterproof breathable membrane hydrophobic polymer polytetrafluoroethylene (PTFE) emulsion as the base material and acetylene black.The main function of PTFE emulsion is formed a lot of gas diffusion pores, so that oxygen can come in and the water vapor to enter, while also preventing leakage of electrolyte.In order to have a uniform porous structure made of the air electrode, usually the waterproof breathable layer and the catalyst layer by adding an appropriate amount of pore-forming agent, such as anhydrous Na2SO4, NH4HCO3 and so on.Were the subject of chemical coprecipitation of NiTiO3 Al-doped as a catalyst, tetrabutyl titanate hydrolysis prepared TiO2 nanoparticles prepared by urea combustion LaxSr1-xMnyNi1-yO3 series of compounds, spinel type oxide as a catalyst,discharge electrode polarization curves will use experimental methods on the catalytic layer and the waterproof breathable layer of 4 main components, namely, PTFE emulsion, respectively, activated carbon, anhydrous Na2SO4, catalyst and PTFE emulsion, activated carbon, acetylene black, the proportion of the amount of anhydrous Na2SO4optimization, discussed the four components of this ratio on the performance of gas diffusion electrode, the cathode composition obtained reasonable to improve the performance of gas diffusion electrodes.Meanwhile, the traditional zinc-to improve the air cell structure to improve discharge performance and discharge capacity, to optimize performance.Anode and electrolyte in a suitable corrosion inhibitor added to reduce the zinc-air batteries dendritic growth, increased discharge capacity.