Electrochemical Study Of Porous Oxide Composite Electrode Applied In Supercapacitor

With the rapid development of modern electronic technology, a large number ofportable electronic products emerged. These products need high active materials withhigh-efficiency energy storage performance. With the shortage of energy and greenenergy concept deeply rooted, traditional battery energy storage has far cannot meetthe practical needs. Formulation of the theory of super-capacitors, as well as synthesisof their related materials and electrode, has increasingly become a hot spot in the fieldof scientific research, and shows great prospect. In this paper, one-pot method is usedto synthesis ultra-thin porous CuO nanobelts,3D porous gear-like CuO and3Dporous spinous iron oxide. These materials are used for the anode material ofsupercapacitors and electrochemical performance test are made too.1、Hydrothermal method has been developed to fabricate porous CuO nanobeltsdirectly grown on a Cu substrate. The as-prepared CuO samples can be directly usedas integrated electrodes for lithium-ion batteries and pseudo-supercapacitors withoutthe addition of other ancillary materials such as carbon black or a binder to enhanceelectrode conductivity and cycling stability. Ultra-thin porous CuO nanobeltsnanostructure which with a huge number of holes formed on it and the larger surfaceareas enable the loading of dramatically increased amount of active materials, thusimproving the energy density per unit area. At the same time, these porous CuOnanobelt electrodes not only achieved an excellent specific capacitance of392F g-1but also achieved excellent cyclability,for example capacity retentivity is90%over5000cycles.2、Hydrothermal method has been used for controlled synthesis of3D porousgear-like Cu(OH)2on Cu substrate. These Cu(OH)2nanostructure are annealed at200°C in air. A huge number of holes formed on each nanoarray which should due tothe dehydration reaction that was happened between adjacent Cu(OH)2moleculesafter annealing. There were plenty of void spaces between neighbouring nanoarrayswhich can allow for the ease of electrolyte penetration. There were several edgeswhich constitute with3D porous gear-like nanostructure and a huge number of holes formed on each edges. Thus, as-synthesized PGC with a large specific surface areawas promising candidate as electrode for electric energy storage. When evaluated asan electrode material for supercapacitors, the as-prepared PGC manifest exceptionalperformance with an usually high specific capacitance of348F g-1at a current densityof1A g-1. Moreover, the excellent cycling stability was confirmed that about88%ofthe initial capacitance can be retained after2000charge/discharge cycles.3、One-pot method is used to synthesized series of3D porous spinous iron oxideon a thin iron plate. The using of Cu substrate as binder-free current collectorssimultaneous minimization of primary resistances present during charge anddischarge. And the spatial three-dimensional network structure possesses largersurface area. This enables the attaching area was dramatically increased betweenactive materials and electrolytethus improving the energy density per unit area. ThinFe plate as flexible scaffolds are the predominant scaffold materials due to itselectronically conductive, mechanically flexible, and chemically stable when betwisted into different shapes. As-synthesized3D porous spinous iron oxide with highspecific surface area exhibited high stability, high specific capacity of1143F g-1while towards into electrochemical test for supercapacitors. Moreover, the excellentcycling stability was confirmed that about87.9%of the initial capacitance can beretained after2000charge/discharge cycles.