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

Autor(es)

Xavier, Farlon F. S. ^[1] ; Bruziquesi, Carlos G. O. ^[2] ; Fagundes, Welique S. ^[1] ; Matsubara, Elaine Y. ^[3] ; Rosolen, Jose M. ^[3] ; Silva, Adilson C. ^[2] ; Canobre, Sheila C. ^[1] ; Amaral, Fabio A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Uberlandia, Inst Quim, LAETE, Av Joao Naves Avila 2121, BR-38408100 Uberlandia, MG - Brazil

^[2] Univ Fed Ouro Preto, Inst Ciencias Exatas & Biol, LQTA, BR-35400000 Ouro Preto, MG - Brazil

^[3] Univ Sao Paulo, Ciencias & Letras Ribeirao Preto, Fac Filosofia, Dept Quim, BR-14040901 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 30, n. 4, p. 727-735, APR 2019.
• Citações Web of Science: 0

Resumo

New composite based on polypyrrole (PPy) and bismuth oxide (alpha-Bi2O3) was investigated as supercapacitor electrode. The alpha-Bi2O3 was obtained by hydrothermal route at 500 degrees C for 2 h. Cyclic voltammetry was used to electropolymerize PPy on graphite electrode (GE) or on GE/alpha-Bi2O3. The X-ray diffraction profile of Bi2O3 revealed the alpha-Bi2O3 monoclinic structure with space group P2(1)/c. The scanning and transmission electron microscopy images showed that PPy coated alpha-Bi2O3. Raman spectra showed that PPy inhomogeneously coated alpha-Bi2O3, but it was still possible to obtain a alpha-Bi2O3 OPPy core-shell hybrid composite with highly ordered alpha-Bi2O3 with electronic interaction between the oxide and the polymer chain of the polymer. The GE/alpha-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 alpha-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)

• Processo FAPESP: 17/04759-2 - Free-binder eletrodos para dispositivos de armazenagem/conversão de energia
• Beneficiário: Jose Mauricio Rosolen
• Modalidade de apoio: Auxílio à Pesquisa - Regular