Controllable Synthesis And Electrochemical Performances Of PANI-NiHCF Nanocomposite Materials

Organic-inorganic nanocomposite materials can show synergistic effects that suppress undesirable properties of individual components and generate enhanced, even create totally new, functionalities. They have attracted more and more attention because of excellent properties in materials synthesis and device fabrication. Among the vast number of hybrid materials, the combination of polyaniline (PANI) and nickel hexacyanoferrate (NiHCF) has been extensively investigated to improve overall performances of electrochemical supercapacitor (ESC), elec-trocatalysts biosensors and so on. The main contents of our work are summarized as follows:Firstly, the electroactive composite films of CNTs/PANI/NiHCF were synthesized on platinum substrates modified with CNTs by one-step co-polymerization of cyclic voltammetry. The components and morphology of the composite films were characterized by fourier transform infrared spectroscopy (FT-IR), energy dispersive X-ray spectroscopy (EDS), and scanning electron microscope (SEM). Cyclic voltammetry (CV), galvanostatic charge/discharge, and electrochemical impedance spectroscope (EIS) were used to study the cycling stability and electrochemical capacitive performance of the CNTs/PANI/NiHCF film. Experimental results show the three-dimensional porous network composite films with uniform distribution of both PANI and NiHCF nanoparticles along the CNTs are formed by this new method. The specific capacitance of the inorganic-organic hybrid films can reach 262.28 F/g with a specific energy of 29.51 Wh/kg at the current density of 2 mA/cm2, and the specific power is 10228.61 W/kg at the current density of 10 mA/cm2. Meanwhile, the films show that the capacity decay is only 19.92% after 2000 charge/discharge cycles and the coulombic efficiency is over 99%.Secondly, PANI-NiHCF nanocomposite particles with three different size had been achieved by adjusting the concentration of aniline in the process of preparation. The formation mechanism of PANI-NiHCF was discussed and the composition/structure-function relationship was also studied in our Work. The composition and microstructure of nanocomposite particles were analyzed by fourier transform infrared spectroscopy, energy dispersive X-ray spectroscopy, and scanning electron microscope. Cyclic voltammetry and electrochemical impedance spectroscope were used to investigate the dynamics of charge transport and its electrochemical performances. Experimental results show that PANI-NiHCF nanoparticles reveal cube-structure, and are uniform and dispersed. And PANI-NiHCF-I are characterized by high dynamics of charge transport, and the calculated value of the transfer coefficientαis 0.467. PANI-NiHCF-II has good stability, and its capacity decay is only 8.7% after 1000 cycles of potential scan. Compare with PANI-NiHCF-III, PANI-NiHCF-I and II are both detected and analyzed alkali metal cations by electrochemically controlled ion separation.