Design And Fabrication Of Supercapacitor Devices Based On Spinel Transitional Bimetal Oxides

The ever-increasing demand for fossil fuels and ever-worsing environment appear with the development of global economy.For the sake of solving such problems,it is indispensable for research and application on new type energy storage devices.Owning to the intrinsic characteristics of supercapacitors,supercapacitors have been intensively investigated by researchers.The electrode materials?both cathode and anode?play irreplaceable roles in designing high energy density supercapacitors.As functional supercapacitor materials,spinel transitional bimetal oxides provide more active reaction sites and exert the synergistic effect of pure oxides.Consequently,improved conductivity,cycling ability and brodened voltage windows are obtained.This essay mainly discusses the preparation,structural modification,test of electrode materials and the assembly of full cell devices.The experimental sections consist of the following three parts:?1?By adjusting the contents of NH₄F in the reaction system,four ZnCo₂O₄ nanostructures with disparate morphologies have been successfully prepared.We further investigated the morphology-dependent surface areas,conductivity and specific capacitance.A full cell based on leaf-like ZnCo₂O₄-4 anode and AC cathode has been fabricated.?2?Al?NO₃?₃·9H₂O has been added into the solution for the preparation of CuCo₂O₄ precursors.After calcination,Al-CuCo₂O₄ with different Al³⁺contents has been obtained and the electrochemical properties are discussed.?3?Fe_xCo_3-xO₄ and N-doped carbon derived from a single metal organic framework FeCo-ZIF67?X?,?X represents for the Fe/Co molar ratio?have been successfully prepared.For the positive electrode,the Fe/Co molar ratio of Fe_xCo_3-xO₄ is discussed for further electrochemical applications.For the negative electrode,the calcination temperature is investigated.For the optimal Fe_xCo_3-xO₄ and N-doped carbon,a full cell is fabricated.