New Synthesis Method for a Core-Shell Composite Based on α-Bi2O3 @PPy and its Electrochemical Behavior as Supercapacitor Electrode

New composite based on polypyrrole (PPy) and bismuth oxide (α-Bi2O3) was investigated as supercapacitor electrode. The α-Bi2O3 was obtained by hydrothermal route at 500 ºC for 2 h. Cyclic voltammetry was used to electropolymerize PPy on graphite electrode (GE) or on GE/α-Bi2O3. The X-ray diffraction profile of Bi2O3 revealed the α-Bi2O3 monoclinic structure with space group P21/c.The scanning and transmission electron microscopy images showed that PPy coated α-Bi2O3. Raman spectra showed that PPy inhomogeneously coated α-Bi2O3, but it was still possible to obtain a α-Bi2O3 @PPy core-shell hybrid composite with highly ordered α-Bi2O3 with electronic interaction between the oxide and the polymer chain of the polymer. The GE/α-Bi2O3@PPy composite electrode (type I supercapacitor) displayed a predominantly capacitive profile with low impedance values and good electrochemical stability after 50 charge and discharge cycles. The specific capacitance of α-Bi2O3 @PPy composite was found in the range of 634 to 301 F g-1 to gravimetric current of 3 and 10 A g-1, respectively.

Bibliographic Details

Main Authors:	Xavier,Fárlon F. S., Bruziquesi,Carlos G. O., Fagundes,Wélique S., Matsubara,Elaine Y., Rosolen,José M., Silva,Adilson C., Canobre,Sheila C., Amaral,Fábio A.
Format:	Digital revista
Language:	English
Published:	Sociedade Brasileira de Química 2019
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532019000400727
Tags:	Add Tag No Tags, Be the first to tag this record!