Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Catalytic properties of Co3O4 nanoparticles for rechargeable Li/air batteries | Kim and Park Nanoscale Research Letters 2012 7 47 http content 7 1 47 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Catalytic properties of Co3O4 nanoparticles for rechargeable Li air batteries Kwan Su Kim and Yong Joon Park Abstract Three types of Co3O4 nanoparticles are synthesized and characterized as a catalyst for the air electrode of a Li air battery. The shape and size of the nanoparticles are observed using scanning electron microscopy and transmission electron microscopy analyses. The formation of the Co3O4 phase is confirmed by X-ray diffraction. The electrochemical property of the air electrodes containing Co3O4 nanoparticles is significantly associated with the shape and size of the nanoparticles. It appears that the capacity of electrodes containing villiform-type Co3O4 nanoparticles is superior to that of electrodes containing cube- and flower-type Co3O4 nanoparticles. This is probably due to the sufficient pore spaces of the villiform-type Co3O4 nanoparticles. Keywords composites nanostructures chemical synthesis electrochemical properties. Introduction A significant increase in the energy density of rechargeable batteries is required to satisfy the demands of vehicular applications and energy storage systems. One approach to solving this problem is the introduction of a new battery system having a higher energy density. Li air batteries are potential candidates for advanced energy storage systems because of their high storage capability 1-3 . They do not store a cathode in the system which allows for a higher energy density than any other commercial rechargeable batteries. Instead oxygen from the environment is reduced by a catalytic surface inside the air electrode. Thus catalysts are key materials that affect the capacity cycle life and rate capability of such batteries. In this study the Co3O4 nanoparticles of various shapes and structures were tested as catalysts of air electrodes for .
