Influence of High Energy Ball Milling and Dispersant on Capacitive Properties of Fe2O3—Carbon Nanotube Composites

Journal of Composites Science

Igor Zhitomirsky¹  Chengwei Zhang¹ 

[1] Department of Materials Science and Engineering, McMaster University, Hamilton, ON L8S 4L7, Canada;

关键词: iron oxide;    carbon nanotube;    supercapacitor;    milling;    dispersant;    nanoparticle;   

DOI  :  10.3390/jcs6060177

来源: DOAJ

【 摘 要 】

This investigation is motivated by increasing interest in ferrimagnetic materials and composites, which exhibit electrical capacitance. It addresses the need for the development of magnetic materials with enhanced capacitive properties and low electrical resistance. γ-Fe₂O₃-multiwalled carbon nanotube (MWCNT) composites are developed by colloidal processing and studied for energy storage in negative electrodes of supercapacitors. High energy ball milling (HEBM) of ferrimagnetic γ-Fe₂O₃ nanoparticles results in enhanced capacitive properties. The effect of HEBM on particle morphology is analyzed. Gallocyanine is used as a co-dispersant for γ-Fe₂O₃ and MWCNTs. The polyaromatic structure and catechol ligand of gallocyanine facilitated its adsorption on γ-Fe₂O₃ and MWCNTs, respectively, and facilitated their electrostatic dispersion and mixing. The adsorption mechanisms are discussed. The highest capacitance of 1.53 F·cm⁻² is achieved in 0.5 M Na₂SO₄ electrolyte for composites, containing γ-Fe₂O₃, which is high energy ball milled and co-dispersed with MWCNTs using gallocyanine. HEBM and colloidal processing strategies allow high capacitance at low electrical resistance, which facilitates efficient charge–discharge. Obtained composites are promising for fabrication of multifunctional devices based on mutual interaction of ferrimagnetic and capacitive properties.

【 授权许可】

Unknown