Aqueous Mg-Ion Supercapacitor and Bi-Functional Electrocatalyst Based on MgTiO₃ Nanoparticles.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Supercapacitors and hydrogen fuel cells are emerging as eco-friendly alternatives to lithium-ion batteries.
• Metal oxide nanostructures with perovskite structures offer unique electrochemical properties due to their electronic band structure and multiple redox-active ions.

Purpose of the Study:

• To synthesize and characterize MgTiO₃ nanoparticles (MTO-1) for advanced energy storage applications.
• To evaluate the supercapacitor performance and electrocatalytic activity of MTO-1 for oxygen and hydrogen evolution reactions.

Main Methods:

• Wet-chemical sol-gel technique was employed to synthesize MgTiO₃ nanoparticles.
• Electrochemical characterization was performed using cyclic voltammetry and galvanostatic charge-discharge in aqueous electrolytes.

Main Results:

• Synthesized MTO-1 nanoparticles with an average size of 50-55 nm.
• Achieved superior supercapacitor performance: 25 F/g capacitance, 17 Wh/kg energy density, 275 W/kg power density, and 82.41% capacitance retention after 1000 cycles.
• Demonstrated promising electrocatalytic activity for both Oxygen Evolution Reaction (OER) and Hydrogen Evolution Reaction (HER) with low overpotentials.

Conclusions:

• MgTiO₃ nanoparticles exhibit excellent electrochemical properties suitable for supercapacitor applications.
• MTO-1 shows significant potential as an electrocatalyst for both OER and HER in alkaline media.
• These findings highlight the viability of MgTiO₃ nanoparticles for diverse electrochemical energy applications.