Electropolymerized Polyaniline/Manganese Iron Oxide Hybrids with Enhanced Electrochemical Energy Storage and Color Switching Response
Yiran Wang,1 Huige Wei,1 Jiang Guo,1 Suying Wei2,* and Zhanhu Guo1,*
1Integrated Composites Laboratory (ICL)
Department of Chemical & Biomolecular Engineering
University of Tennessee, Knoxville, TN 37909 USA
2Department of Chemistry and Biochemistry
Lamar University, Beaumont, TX 77710 USA
Polyaniline (PANI) nanocomposites embedded with manganese iron oxide (MnFe2O4) nanoparticles were prepared as thin films by electropolymerizing aniline monomers onto indium tin oxide (ITO) glass slides pre- spin-coated with MnFe2O4 nanoparticles. The shift of the characteristic peaks of PANI/MnFe2O4 in UV-visible absorption spectra and fourier transform infrared spectroscopy (FT-IR) indicate a formation of composite films and a chemical interaction between the PANI matrix and MnFe2O4 particles, which is also confirmed by the SEM images. A coloration efficiency of 206.2 cm2 C-1 was obtained for the PANI/MnFe2O4 nanocomposite film, higher than that of the pristine PANI film, 104.2 cm2 C-1, suggesting a synergistic effect between the MnFe2O4 particles and the PANI matrix. An enhanced areal capacitance as 4.46 mF cm-2 was also achieved in the PANI/MnFe2O4 nanocomposite film compared with that of 3.95 mF cm-2 in the pristine PANI film from the CV at a scan rate of 5 mV s-1. The enhanced capacitance of the composite films are attributed to the pseudocapacitive property of MnFe2O4 and the rougher morphology caused by the embedment of MnFe2O4 particles into the PANI matrix. Finally, the sulfuric acid (H2SO4) concentration and temperature effects on the supercapative behavior of the pristine PANI and its MnFe2O4 nanocomposites films were studied, suggesting positive effects of decreasing H2SO4 concentration and increasing temperature during a low temperature range, relative higher temperatures can destroy the PANI structure and cause the degradation of PANI.
1. H. Wei, C. He, J. Liu, et al, Polymer, doi:10.1016/j.polymer.2015.04.064.
2. H. Wei, Y. Wang, J. Guo, X. Yan, et al, ChemElectroChem, 12(1) (2015) 119-126.
3. X. Zhang, J. Zhu, N. Haldolaarachchige, et al, Polymer, 53(10) (2012) 2109–2120.
See more of this Group/Topical: Materials Engineering and Sciences Division