Impact of mesoporous SiO2 support for Ni/polypyrrole nanocomposite particles on their capacitive performance. (4th November 2022)

• Record Type: Journal Article
• Authors: Ali, M. Sagor; Rahman, M. Mahabur; Hossain, M. Kawsar; Minami, Hideto; Rahman, M. Mahbubor; Hoque, S. Manjura; Alam, M. Ashraful; Ahmad, Hasan
• Is Part Of: New journal of chemistry. Volume 46:Number 45(2022)
• Page Start: 21798
• Page End: 21811
• Publication Date: 2022-11-04
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d2nj04320c
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : The inclusion of mesoporous H2 N-SiO2 support in H2 N-SiO2 /Ni/PPy nanocomposite particles improved their electrochemical performance, suitable for energy storage devices. Abstract : Electro-conducting polypyrrole (PPy) coated H2 N-SiO2 /Ni nanocomposite particles are prepared by a three-step process. The objective is to analyze the influence of porous functional SiO2 support on the electrochemical performance of the prepared H2 N-SiO2 /Ni/PPy nanocomposite particles. H2 N-SiO2 support is first prepared by a modified sol–gel method and then co-ordinated with Ni nanoparticles via an amine functionality. Finally, H2 N-SiO2 /Ni/PPy nanocomposite particles are prepared by in situ chemical oxidative polymerization of pyrrole using citric acid as a dopant. Fourier Transform IR (FTIR) and X-ray photoelectron spectroscopy (XPS) confirmed the formation of co-ordinated Ni/Ni 2+ nanoparticles and a PPy layer with almost a core–shell type morphology. The mesoporous surface structure of H2 N-SiO2 core-particles is confirmed from the morphological study and the specific surface area gradually decreased from 496 m 2 g −1 to 59 m 2 g −1 following subsequent surface modification with Ni nanoparticles and the PPy layer. The ultimate nanocomposite particles had paramagnetic properties and the magnetization value is 4.8 emu g −1 . Comparative electrochemical performance between electrodes made from the respective PPy, Ni/PPy and H2 N-SiO2 /Ni/PPy showed the highest specific capacitance value (982.6 F g −1 from cyclic voltammetry curves) for the H2 N-SiO2 /Ni/PPy nanocomposite. The H2 N-SiO2 /Ni/PPy nanocomposite electrode is fairly stable during cycling measurement. The results indicated that the use of mesoporous functional SiO2 support remarkably improved the mechanical stability and capacitive performance of the H2 N-SiO2 /Ni/PPy nanocomposite electrode, suitable for application in energy storage devices.