Preparation And Electrochemical Property Of PANI/α-ZrP Hybrid Film

Organic and inorganic hybrid materials have attracted more and more attention. Organic and inorganic electric functional material was a mixed conductor with electron and ion, and this material could absorb and desorb ions by changing its redox properties. So there was broad application in ion exchange, chemical sensors and electric catalysis and so on.Polyaniline (PANI) was the most widely studied conducting polymer because of its low cost, high conductivity, easy modification of structures, unique acid doping property. It was commonly used in the acid condition. Layered α-zirconium phosphate (α-ZrP) was layered compound which had a high thermal stability and chemical stability. The preparation of α-ZrP was simple. α-ZrP as a kind of solid acid containing changeable protons which can exchange protons after peelling to nano single flake. However, α-ZrP had poor conductivity. So PANI and α-ZrP can be composited for preparing electrochemical activity film. α-ZrP provided hydrogen proton acids to PANI, in addition, PANI can provide a conductive environment to α-ZrP which resulted that hybrid materials can be applied in neutral conditions. The paper content was roughly divided into three parts, the first part mainly examined the effect of peeling solvent on electrochemical performance of PANI/a-ZrP hybrid film. The second part of paper was facile preparation of PANI/a-ZrP hybrid film for detecting potassium ion in a wide linear range. The third part was PANI/a-ZrP hybrid film prepared by different concentration of aniline and selectivity to metal cation.The third part of paper discussed the influence of acetonitrile and water to exfoliate α-ZrP, then PANI/α-ZrP hybrid film was synthesized on carbon paper using cyclic voltammetry(CV). We investigated the effect of different solvents on preparation and electrochemical property of films. The results showed that the hybrid film prepared in acetonitrile solvent had a larger layer spacing (1.42nm) compared with the layer spacing (1.12nm) of hybrid film prepared in aqueous phase, the first one had a better CV performance than the latter one, and it was more sensitive to the Ni2+and had a high desorption ratio and less resistance.The forth part discussed the performancs of PANI/α-ZrP hybrid film and α-ZrP was exfoliated in acetonitrile solvent. The mechanism of preparation, the exfoliation solution and concentration of aniline were discussed. The hybrid film was as a sensor to detect the concentration of potassium ions. The testing solution pH and the influence of the interference ions were studied. Besides, the mechanism of detecting potassium was proposed. The results showed PANI/α-ZrP hybrid film had a good response to potassium ions. Logarithm concentration of potassium ions had good linearity relationships to oxidation peak currents in10-8～-10-4M and10-4～10-2M and the film had good reversibility and repeatability. The parameters of good film were0.02mol/L aniline and the pH of testing liquid was7.2. The influence of Na+and Cl-to the detection was small.The last part discussed the PANI/a-ZrP hybrid films were prepared on a platinum substrate using unipolar pulse method. The layer space of hybrid film can be regulated by changing the concentration of aniline. The layer spacing was growing with the increase of concentration of aniline, however the layer spacing almost didn’t increase when the concentration of aniline was greater than0.02M. The results showed the different layer space have different selectivity to Cd2+, Pb2+, Ba2+, as these cation had different hydrated ion radius and hydration Gibbs free energy. When pulse number was400times, the preparation temperature was40℃, and testing temperature was60℃, the hybrid film had a better electrochemical performance.