The Simple Preparation Of Manganese Oxide And Its Electrochemical Performance

The research and application of new energy technologies to replace traditional fossil fuels is one of the hotspots in global technology research.The common global goal is how to mitigate and solve the environmental problems.New energy resources and energy storage technologies are the only way to replace traditional energy in the future.As important inorganic functional materials,MnOOH,MnO₂ and other manganese oxide nanomaterials have broad application prospects in super capacitors,sensors,magnetic materials and other scientific and technological fields.At present,general methods for preparing MnOOH,MnO₂ and other manganese oxide nanomaterials include hydrothermal method,liquid-phase precipitation method and thermal decomposition method.Among them,there are many problems such as high temperature,long reaction time,and great toxicity of the reducing agent when prepared by the hydrothermal method.Because of its good capacitance performance,low cost,and environmental protection,manganese oxide can better meet the application requirements than other oxide systems,and has gradually become the focus of the development of supercapacitor electrode materials.There are many valence states of manganese oxides,mainly including Mn?0?,Mn???,Mn???.There are many kinds of oxides,and the capacitance mainly comes from protons and ions between the electrode and the electrolyte redox pseudocapacitors produced by exchange and electron transfer between different valence states of manganese.Although the application of manganese oxide as the electrode material of supercapacitors has been developed rapidly in recent years,manganese oxide itself has weak conductivity and has not yetreached the standard for mass production.Therefore,how to prepare nano-manganese oxides through a more environmentally friendly,more convenient and lower cost method has become an important research direction.At the same time,the research on the electrochemical performance of manganese oxides is also worth further research.This paper prepares the manganite by hydrothermal reaction and roast,with the reactant of KMnO₄ and the reducing agent of glutathione?hereinafter referred to as GSH?.As a result,the MnOOH with nanowires structure is prepared and MnO₂ with nanowires structure is generated by calcination.The morphology and structure of the product were characterized by SEM?Scanning Electron Microscope?,EDS?Energy Dispersive Spectrometer?,XRD?Diffraction of X-ray?and XPS?X-ray photoelectron spectroscopy?.The electrochemical properties of materials ae studied by electrochemical workstation.Combined with the existing technology theory and previous research,the following research results are obtained:1.MnOOH micro/nano rods are synthesized from KMnO4 and GSH by hydrothermal reaction at suitable temperature.The SEM,XRD and XPS tests with different reaction times are analyzed and the reaction mechanism is explored.By changing the experimental reaction temperature,the optimal reaction conditions are explored,and the electrochemical properties of the material are studied by testing the cyclic voltammetry?CV?constant current charge and discharge?GCD?and electrochemical impedance spectroscopy?EIS?in 1 M Na₂SO₄ solution using a three-electrode system.2.MnO₂ micro/nano rods are generated by calcined raw materials?-MnOOH micro/nano rods prepared in 1's The electrochemical properties of the materials are studied by cyclic voltammetry?CV?and electrochemical impedance spectroscopy?EIS?in 1 M Na₂SO₄ solution.