New synthesis method for a core-shell composite based on α-Bi2O3@PPy and its electrochemical behavior as supercapacitor electrode.

• Autor(a) principal: Xavier, Farlon Felipe Silva
• Data de Publicação: 2019
• Outros Autores: Bruziquesi, Carlos Giovani Oliveira, Fagundes, Wélique Silva, Matsubara, Elaine Yoshiko, Rosolen, Jose Mauricio, Silva, Adilson Cândido da, Canobre, Sheila Cristina, Amaral, Fábio Augusto do
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFOP
• Texto Completo: http://www.repositorio.ufop.br/handle/123456789/11150; http://dx.doi.org/10.21577/0103-5053.20180192
• topic: Conducting polymers; Bismuth oxide; Supercapacitors; Electrochemical devices

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 °C 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.