Morphology Controlled PANI/NiHCF Particled Nanocomposite Films

Organic/inorganic nanocomposite have attracted extensive attention and stimulated wide-ranging research because they could show synergistic effects that suppress undesirable properties of individual components. Polymer and inorganic composites are widely applied owing to their good optical, electrical, electrocatalytic and compatible properties. The research of chemically modified electrode is an active field of electrochemistry and electroanalytical chemistry presently. As electrode materials, polymer and inorganic nanoparticle composites have been applied to prepare electrochemical supercapacitor, electrochromic device, elec-trocatalysts biosensors and so on.Among the vast number of organic/inorganic nanocomposites, the combination of polyaniline (PANI) and nickel hexacyanoferrate (NiHCF) have attracted much attention. Many researches showed that the morphology and electrochemical performance of composites were greatly influenced by preparation conditions, so we can obtain different materials through controlling the preparation conditions in order to meet different functional requirements. First of all, The PANI/NiHCF nanocomposite particles were synthesized on CNTs-modified Pt substrate by one-step co-polymerization of cyclic voltammetry. Electrochemical quartz crystal microbalance (EQCM) technique was adopted to investigate the polymerization process of the nanocomposite particles and the mechanism of ion exchange in aqueous solution containing Cd2+. The morphologies and structures of the prepared composite particles were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), and fourier transform infrared spectroscopy (FT-IR), respectively. Combined with cyclic voltammetry (CV) method, the electrochemical behavior and the mechanism of ion exchange were also investigated in aqueous solution containing Cd2+. Experimental results indicated that the cubic nanocomposite particles of PANI/NiHCF have formed and distributed uniformly on the CNTs-modified Pt substrate, and the particles had good electroactivity and reversible electrochemical behavior in aqueous solution containing Cd2+, and Cd2+ion could be separated from aqueous solutions by ESIX processes.PANI/NiHCF nanocomposite films on CNTs-modified Pt substrate with different morphologies and sizes had been obtined by adjusting the pH (ranging from pH0to7) of solutions by CV. The films were found to grow from strong acidic environments at much faster rate and appeared to adopt different growth patterns from those grown from higher pH media, thus the nanocomposite films with different morphologies ranging from particles to films like structures. The components and morphologies of the composite films were characterized by FT-IR and SEM. The supercapacitive performances of the nanocomposite films were also investigated with CV, charge/discharge tests (GCPL) and electrochemical impedance spectroscopy (EIS). All the nanocomposite films obtained from pH0to7gave high specific capacitance which can be up to434F-cm-2in1mol-L-1KNO3. This extends the application prospect of PANI/NiHCF nanocomposite films in the aspect of supercapacitor.