Aqueous Supercapacitors with Ultrawide Potential Window and pH Independent Stability Using Electrodes of Graphene Oxide Nanoribbons/Fe-MOFs Nanocomposite

A method of fabricating a supercapacitor electrode with enhanced electrochemical properties for energy storage systems, comprising:

• (a) synthesizing solid samples of graphene oxide nanoribbons (GONRs) by oxidative unzipping of Multi-Walled Carbon Nanotubes (MWCNTs);
• (b) hydrothermally making a powder of iron-metal-organic frameworks (Fe-MOFs) using a hydrothermal;
• (c) physically mixing the solid samples of GONRs and powder of Fe-MOFs while maintaining a substantial weight ratio of 1:1 in the mixing of the solid samples and powder and thereby making a GONRs/Fe-MOFs composite;
• and
• (d) ultrasonically mixing the physical mixing the GONRs/Fe-MOFs composite for at least 1 hour at about 300 Watt and at room temperature ranging from 24 degrees Celsius to 26 degrees Celsius.