Preparation Of Ferrocene Based Polymers And The Study Of Electrochemical Properties

With the rapid increase of energy demand,the gradual reduction of fossil fuels,which is non-renewable resources,are difficult to provide long-term and convenient supply for human production and life.Expansion in new energy storage materials is imminent.At present,although lithium-ion battery has become the mainstream of battery materials because of its high energy density,long cycle stability and high power density,it is still difficult to meet the new requirements on the flexibility and safety of the energy storage materials.Because of its convenient processing,easily designing and controlling,polymers can be used as flexible materials.Polymer materials,with the hot rise of flexible electronic devices,have become a hot spot in the field of energy storage materials,especially in the direction of flexible materials.Ferrocene based polymer,as the most typical organic transition metal polymer,has both the advantages of polymer materials and the unique properties of organic transition metals in electricity and electrochemistry,and has huge value to explore and research.At present,main electrolytes in electrochemical devices are organic electrolytes,aqueous electrolytes and polymer solid electrolytes.Aqueous battery has the advantages of non-flammable,easy assembling,low cost,high conductivity and so on,which is an important research direction in battery field at present.The ferrocenyl silane polymer can make the membrane materials with stable redox potential through purposeful design,and can improve its oxidation potential to widen its application range.Herein,ferrocenyl silane polymer can be applied in electrochemical and energy storage field by researching on electrochemical behaviors in aqueous solutions.In this paper,poly(ferrocenylmethylsilane),poly(ferrocenylmethylsilane),poly(ferrocenylmethylchlorosilane)were synthesized purposely and then characterized by Nuclear Magnetic Resonance Spectroscopy,Fourier Transform infrared Spectroscopy,Scanning Electronic Microscopy,Energy Dispersive Spectrometer,X-ray Diffraction,Thermogravimetric Analysis and Raman Spectroscopy.The electrochemical behavior of three kinds of polymers in aqueous solutions was studied.The cyclic voltammetry curves of three polymers in solutions of lithium sulfate,sodium chloride,potassium nitrate,lithium nitrate,sodium nitrate,sodium sulfate,sodium hydroxide,sodium bromide,ammonium chloride,lithium perchlorate,sodium perchlorate in aqueous solutions and sodium perchlorate in acetonitrile were studied.The three polymers have similar structures,but the electrophilic ability of the functional groups around the iron active centre is gradually increasing and so are the oxidation potential,which confirms that we can control the oxidation potential of ferrocene based polymers by introducing functional groups.The oxidation potential of the three polymers is above 0.55V,relative to the saturated calomel electrode.In this paper,we also research on the relationship between the electrochemical behaviors of the three polymers with the sweep speed,concentration of electrolytes and mass on per unit.The results show ferrocene based polymers appear redox peaks and cyclic voltammetry curves are symmereic and remain uncharged which illustrates polymer materials have stable oxidation potential and reduction potential and good cycle stability.It tells us that ferrocene based polymers have good electrochemical properties in aqueous solutions.With the increase of sweep speed of cyclic voltammetry,the oxidation potential and reduction potential respectively shift to positive potential and negative potential.The difference value is enlarging,which illustrates the electrode is controlled by diffussion and suggests the process of permeation and emigration of anions on electrode surface.Sweep speed,concentration of electrolytes and mass on per unit can change electrochemical behaviors in aqueous solutions,which interprets that we can control the electrochemical properties by changing sweep speed,concentration of electrolytes and mass on per unit.