Progress in Application of Carbon/Perovskite-Type Composite Oxide Bifocals in Metal-Air Batteries
Metal-air battery has the advantages of high energy density,good safety performance,low cost,no pollution and so on.It is a kind of pre-coated chemical energy storage and conversion device.However,the kinetics of oxygen reduction reaction(ORR)and oxygen release reaction(OER)are slow,and they depend on expensive precious metal catalysts(such as Pt or Ir),which hinder the development of sustainable commercialization.Perovskite-type oxides have attracted much attention in recent years due to their high inherent catalytic activity,abundant species,low cost and abundant resources,and are expected to become efficient ORR and OER catalysts instead of noble metal based catalysts.Because of low intrinsic conductivity of perovskite oxides,it is generally believed that conductive carbon is needed to enhance the electronic conductivity inside perovskite electrode for maximizing the utilization of perovskite.The preparation methods of perovskite-type bifunctional catalysts supported by carbon materials,such as sol-gel,chemical vapor precipitation,hydrothermal and electrospinning methods,are reviewed,and the advantages and disadvantages of each preparation method are summarized.The Application of Perovskite/carbon composite bifunctionnal catalysts in three kinds of common metal-air batteries is reviewed.Finally,the challenges and future directions of synthesis and development of highly effective oxygen catalysts based on perovskite/carbon composite are put forward.
perovskite/carbon compositepreparation of catalystmetal-air battery
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