Work

Binder-Free Fe2O3/MWCNT/Al Electrodes for Supercapacitors

Year: 2025

Type: article

Abstract: In this work, a method has been developed for the to prepare a Fe2O3/MWCNT/Al composite electrode without the use of a binder. The synthesis of the compo-site material directly on conductive substrates allows to obtain ready-made supercapacitor elec-trodes characterised by high values of specific capacity as well as resistance to numerous charge/discharge cycles. The use of an array of multi-walled carbon nanotubes (MWCNTs) as a conductive base for the synthesis of iron oxide allows the production of a composite material that combines the positive properties of both materials. The Fe2O3/MWCNT/Al composite was formed by electrochemical oxidation of the MWCNT/Al material in a mixture of 0.1 M aqueous solution of Fe(NH4)2(SO4)2 ( iron ammonium sulfate) and 0.08 M CH3COONa (sodium acetate) in a 1:1 ratio. The proposed approaches to fabricate composite electrodes provide excellent performance characteristics: excellent cyclic stabil-ity and high response time. For the first time, the Fe2O3/MWCNT/Al composite was obtained by electrochemical oxidation of Fe2+ on the surface of MWCNTs grown directly on aluminum foil. The specific capacitance of the obtained composite material reaches 175 F/g at a scanning rate of 100 mV/s. The capacity loss during cyclic measurements does not exceed 25% after 10,000 charge/discharge cycles.

Source: Nanomaterials

DOI: 10.3390/nano15161222

Authors: Alena A. Mitina, Evgene E. Yakimov, Maxim A. Knyazev, Viktor I. Korotitsky, Arkady N. Redkin

Institutions: Russian Academy of Sciences, Institute of Microelectronics Technology and High Purity Materials

Language: English

Topic: Supercapacitor Materials and Fabrication

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,896

Funder: Russian Science Foundation