Unipolar Pulse Deposition And Super-capacitor Performances Of PANI Nanofiber And PPy/NiHCF Composite Material

With the science and technology renews day by day, the new material's synthesis technology also alternates rapidly. Controllable Preparation of materials has attracted wide attention, also due to the advantages performance from both single component and it can create a new function, the organic/inorganic composite materials have attract more and more attention by researchers. Conductive polymer and the composite materials with hexacyano metalate have the extensive research prospect, which can be improved in the capacitor performance by doping. For this reason we have carried on the preliminary discussion and the research of the synthesis and the capacitor performance of conducting polymers and the composite materials with hexacyano metalate.Polyaniline (PANI) nano-fiber materials with different sizes were prepared on the platinum electrode by unipolar pulse deposition (UPD) through controlling the electrochemical parameters during the deposition process. The different preparation parameters to the electrochemical activity as well as the capacity of PANI nanofibers were studied by cyclic voltammetry (CV), super-capacitor performance of PANI nanofibers in acidic solution were tested by galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS), the scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were used to character the morphologies and structures of PANI nanofibers. Then it was compared with the PANI prepared through cyclic voltammetry. The results showed that:the PANI nanofibers with different diameters from 200 nm to 90 nm were prepared by controlling the pulse potential. On the platinum electrode, the PANI was deposited through unipolar pulse method by adjusting the pulse potential had a high specific capacitance with 891.74 F·g-1, the specific energy and power of that were 111.78 Wh·kg-1 and 1583.3 W·kg-1. PANI nanofibers prepared under the 0.8 V pulse potential has good stability that could stay with 98% after 500 cycles of cyclic voltammetry. By comparison, it was found that the electrochemical properties of PANI nanofibers synthesized by unipolar pulse method was much better than obtained by cyclic voltammetry, and the morphologies and structures of PANI produced by two methods were different.On the basis of the context, unipolar pulse deposition was used to synthesize PPy/nickel hexacyanoferrate (PPy/NiHCF) composite film material, which had a good electrochemical activity in neutral solution. Cyclic voltammetry (CV) was used to test the peakshape changes of composite material to infer its composition preliminary. Also the characteristic of charge transfer dynamic in composite material was explored. Capacitive behavior of the PPy/NiHCF composite film was explored using galvanostatic charge/discharge method and electrochemical impedance spectroscopy (EIS). Then Fourier transform infrared spectroscopy (FTIR) was used to characterize the composition of the composite film preliminary. The results of experimental work indicated that:The unipolar pulse deposition could synthesis PPy/NiHCF composite film material by one step; it was found that the composite material would have the better electrochemistry properties, when the pulse potential was 0.8 V. Under the same synthesized condition, the composite materials would have a higher specific capacitance and energy, and have a better CV stability than the exclusive material.