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

Author(s)

Fárlon F. S. Xavier ^[1] ; Carlos G. O. Bruziquesi ^[2] ; Wélique S. Fagundes ^[3] ; Elaine Y. Matsubara ^[4] ; José M. Rosolen ^[5] ; Adilson C. Silva ^[6] ; Sheila C. Canobre ^[7] ; Fábio A. Amaral ^[8]

Affiliation

^[1] Universidade Federal de Uberlândia. Instituto de Química. Laboratório de Armazenamento de Energia e Tratamento de Efluentes - Brasil

^[2] Universidade Federal de Ouro Preto. Instituto de Ciências Exatas e Biológicas. Laboratório de Química Tecnológica e Ambiental - Brasil

^[3] Universidade Federal de Uberlândia. Instituto de Química. Laboratório de Armazenamento de Energia e Tratamento de Efluentes - Brasil

^[4] Universidade de São Paulo. Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto. Departamento de Química - Brasil

^[5] Universidade de São Paulo. Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto. Departamento de Química - Brasil

^[6] Universidade Federal de Ouro Preto. Instituto de Ciências Exatas e Biológicas. Laboratório de Química Tecnológica e Ambiental - Brasil

^[7] Universidade Federal de Uberlândia. Instituto de Química. Laboratório de Armazenamento de Energia e Tratamento de Efluentes - Brasil

^[8] Universidade Federal de Uberlândia. Instituto de Química. Laboratório de Armazenamento de Energia e Tratamento de Efluentes - Brasil

• Document type: Journal article
• Source: Journal of the Brazilian Chemical Society; v. 30, n. 4, p. 727-735, 2019-04-00.

Abstract

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. (AU)

• FAPESP's process: 17/04759-2 - Free-binder electrodes for storage/conversion energy
• Grantee: Jose Mauricio Rosolen
• Support Opportunities: Regular Research Grants