Work

MOF-Derived Fe2O3@Fe3O4-Coated Carbon Fiber Fabric as a Negative Electrode for Flexible Supercapacitors

Year: 2026

Type: article

Abstract: Owing to the increasing demand for wearable electronics, flexible energy storage devices, such as supercapacitors, have gained interest in the electronic industry. In this context, asymmetric configurations have emerged as a promising strategy for the development of wider potential window supercapacitors. On the other hand, MOF-derived synthesis of transition metal oxides is known to result in porous materials, which exhibit better electrochemical performance. In this work, a MOF-derived Fe2O3 coating on carbon fiber woven substrate is proposed as a negative supercapacitor electrode for asymmetric flexible devices. Moreover, the MOF calcination time was evaluated in order to ensure the best electrochemical performance possible, achieving for the sample calcined for 2 h a specific capacitance of 18.8 F/g at a current density of 200 mA/g and an excellent rate capability. In addition, not only was this promising material obtained, but an asymmetric flexible supercapacitor based on two MOF-derived TMO coatings on carbon fiber woven electrodes was manufactured and characterized as a proof of concept. This supercapacitor displayed a specific capacitance of 229 mF/cm2, an energy density of 0.067 mWh/cm2 and a power density of 0.11 mW/cm2 at 0.15 mA/cm2. Moreover, the flexible supercapacitor retained 94.1% of its capacitance even after being bent to 90°.

Source: Batteries

DOI: 10.3390/batteries12040141

Authors: Andrés González-Banciella, David Martinez-Diaz, Joaquín Artigas-Arnaudas, Bianca K. Muñoz, María Sánchez, Alejandro Ureña

Institution: Universidad Rey Juan Carlos

Language: English

Topic: Supercapacitor Materials and Fabrication

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: gold

Estimated APC paid: $3,258