Self-sustaining hybrid electrode prepared from polyaniline, carbon nanotubes, and carbon fibers: morphological, structural, and electrochemical analyses

Autor(es)

Almeida, D. A. L. ^[1] ; Edwards, E. R. ^[1] ; Ferreira, N. G. ^[1]

Afiliação do(s) autor(es)

^[1] Inst Nacl Pesquisas Espaciais INPE, Lab Assoc Sensores & Mat, Ave Astronautas 1758, BR-12227010 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Solid State Electrochemistry; v. 22, n. 1, p. 69-80, JAN 2018.
• Citações Web of Science: 3

Resumo

The self-sustaining hybrid electrode was prepared via chemical polymerization of aniline in acid medium containing dispersed carbon nanotubes (CNT), using carbon fiber (CF) as conducting substrate. The ternary composites called PAni/CNT/CF were characterized in order to evaluate their morphologies, structures, and thermal properties. The influence of the polyaniline (PAni) layer in the ternary composite properties was studied considering different deposition times on CF samples (30, 60, and 90 min). The ternary composite morphologies were observed by scanning electron microscopy while thermal structural analyses were obtained using thermogravimetric measurements. The structural features were analyzed by Raman scattering spectroscopy and Fourier transform infrared spectroscopy (FTIR). The possible interactions between PAni and CNT were discussed on the basis of Raman and FTIR spectra. These spectroscopic analyses also confirmed that the PAni present in the composite is in the emeraldine (ES) salt form. Furthermore, the ternary composites were also evaluated by electrochemical measurements such as cyclic voltammetry (CV), galvanostatic charge-discharge, and electrochemical impedance spectroscopy (EIS) techniques. The results showed good charge storage capacity for ternary composites, in particular, for PAni/CNT/CF obtained with 90 min of deposition time, which exhibited specific capacitance of around 500 F g(-1). Therefore, this electrode was selected to build a prototype of type I supercapacitor. This device presented specific capacitance of around 143 F g(-1) after 3200 charge/discharge cycles. (AU)

• Processo FAPESP: 09/17584-0 - Estudo de Compósitos de Nanotubos de Carbono, Fibras de Carbono e Polianilina como Eletrodos em Dispositivos de Conversão e Armazenamento de Energia.
• Beneficiário: Dalva Alves de Lima Almeida
• Modalidade de apoio: Bolsas no Brasil - Doutorado