ELECTROCHEMICAL PREPARATION OF PANI/CeO2 COMPOSITE WITH SPECIAL MORPHOLOGY
SANG Xiaoguang1, ZENG Fanwu2, LIU Xiaoxia1
1. Department of Chemistry, Northeastern University, Shenyang 110819
2. National Laboratory for Materials Science, Institute of Metal Research,Chinese Academy of Sciences, Shenyang,110016
Cite this article:
SANG Xiaoguang, ZENG Fanwu, LIU Xiaoxia. ELECTROCHEMICAL PREPARATION OF PANI/CeO2 COMPOSITE WITH SPECIAL MORPHOLOGY. Acta Metall Sin, 2012, 48(4): 508-512.
Abstract Composite materials consisting of conducting polymers and inorganic particles have attracted considerable attention as they combine the advantages of both components and have potential applications in many fields. Electrodeposition is an attractive method for the preparation of thin films since it offers the advantages of low processing temperature, normal handling pressure, high purity of deposition, and controlled thickness of the film. Polyaniline/CeO2 (PANI/CeO2) composite with “horn--like” morphology was prepared by potentiostatic electrodeposition method in 0.05 mol/L Ce(NO3)3 containing 0.05 mol/L CH3COOH and 0.025 mol/L aniline (An) at 1.1 V (vs SCE) (pH=5.5). The morphology and composition of the PANI/CeO2composite were characterized by SEM and TEM. The results indicated that the PANI/CeO2 composite had “horn--like” morphology. Characteristic vibrations of PANI were observed on the Fourier transform infrared spectrum (FTIR) of PANI/CeO2 composite. The PANI/CeO2 composite displayed characteristic electrochemical behaviors of PANI in phosphate buffer (pH=6.9), based on cyclic voltammetric experiments. The influences of electrodeposition conditions on the morphology of the composite were investigated by changing the reaction time and the potentiostatic potential. The results showed that potential is the key factor for the formation of “horn--like” PANI/CeO2 composite. PANI/CeO2 composite obtained at 0.8 V existed in nanoparticles. No “horn-like” composite was observed at this lower potential, even after prolonged reaction time. More protons were released during the electrochemical polymerization of aniline and the electrochemical deposition of CeO2 at higher potential. One--dimensional growth of PANI was promoted due to the effect control of secondary growth of PANI at lower pH media, resulting in nanofibrous composite. More PANI and CeO2 were formed along with the electrodeposition and so more protons were released. Thus the nanofiber changed thinner and “horn-like” PANI/CeO2 was formed.
