From electrode to device characterizations of polyaniline/micro and nanodiamond/carbon fiber as ternary composites applied as supercapacitor

Author(s)

da Silva, Lilian Mieko ^[1] ; de Lima Almeida, DaIva Alves ^[1] ; Oishi, Silvia Sizuka ^[1] ; Couto, Andrea Boldarini ^[1] ; Ferreira, Neidenei Gomes ^[1]

Affiliation

^[1] Natl Inst Space Res INPE, Av Astronautas 1758, BR-12227010 Sao Jose Dos Campos, SP - Brazil

• Document type: Journal article
• Source: Journal of Solid State Electrochemistry; v. 23, n. 6, p. 1871-1885, JUN 2019.
• Web of Science Citations: 0

Abstract

Production and characterization of polyaniline/boron-doped diamond/carbon fiber (PAni/diamond/CF) ternary composites are presented in this work, as well as the application as electrode for a supercapacitor device. Different diamond morphologies were evaluated, boron-doped nano- and microcrystalline diamond (BDND/BDD). PAni was chemically synthetized in different deposition times, from 10 to 60min. FEG-SEM images showed differences on PAni deposition for each condition. Raman and FTIR analyses confirmed PAni formation as its conductive form. TGA analyses exhibited the samples' thermal behaviors. Through electrochemical characterizations, PAni deposition time and diamond influence were studied. Diamond films improved PAni deposition and enhanced electrochemical reversibility, especially BDD. For the 10-min deposition, diamond influence was better observed, and the composites showed to be reversible even at high scan rates. However, for 60min, the electrodes presented a much higher charge storage capacity. Therefore, BDD film with 60min of PAni deposition proved to be the best combination, in which the composite presented a specific capacitance of 520Fg(-1) in 1molL(-1) H2SO4. Thus, this electrode was used for the supercapacitor device assembly, exhibiting high capacitive behavior, 99% of coulombic efficiency, 83% of capacitance retention after 1000cycles, and a tendency to stabilize capacitance along the number of cycles. (AU)

• FAPESP's process: 14/27164-6 - Production and characterization of reticulated vitreous carbon/nanodiamond/silver nanoparticles composites used for nitrate removal
• Grantee: Silvia Sizuka Oishi
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 13/24396-0 - Carbon fiber/nanodiamond/polyaniline composites interconnected in water cleaning processes and/or energy convertion devices
• Grantee: Lilian Mieko da Silva
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 16/13393-9 - Semiconductor, polymeric, and carbonaceous composite electrodes ayming the synergy between water cleaning and energy storage processes
• Grantee: Neidenei Gomes Ferreira
• Support Opportunities: Regular Research Grants