Prussian Blue Anchored on Reduced Graphene Oxide Substrate Achieving High Voltage in Symmetric Supercapacitor

Avila L.B.; Serrano P.A.; Quispe L.T.; Dantas A.; Costa D.P.; Arizaca E.E.C.; Chávez D.P.P.; Portugal C.D.V.; Müller C.K. · Materials (2024) · DOI: 10.3390/ma17153782

Resumen

In this work, iron hexacyanoferrate (FeHCF—Prussian blue) particles have been grown onto a reduced graphene oxide substrate through a pulsed electrodeposition process. Thus, the prepared FeHCF electrode exhibits a specific volumetric capacitance of 88 F cm−3 (specific areal capacitance of 26.6 mF cm−2) and high cycling stability with a capacitance retention of 93.7% over 10,000 galvanostatic charge–discharge cycles in a 1 M KCl electrolyte. Furthermore, two identical FeHCF electrodes were paired up in order to construct a symmetrical supercapacitor, which delivers a wide potential window of 2 V in a 1 M KCl electrolyte and demonstrates a large energy density of 27.5 mWh cm−3 at a high power density of 330 W cm−3.

Instituciones: Universidad Nacional de San Agustín de Arequipa; Universidad Católica de Santa María