Temperature‐Driven Structural and Electrochemical Evolution of Manganese Oxide Nanoparticles for Supercapacitor Applications

The progress of the electrochemical energy storage system significantly influences the growth of the national economy. Along with high power and energy density, enhanced performance rate, extended cycle life, quick charging—discharging, and safety features, tenders' supercapacitors (SCs) are a promising energy storage solution. For better storage, SC materials need longevity, safety, cost‐effectiveness, high capacitance, and conductivity. SCs primarily rely on the material's high surface area, conductivity, and stability. Even though carbon is perfect for energy storage applications owing to its electrochemical stability, its relatively low specific capacitance limits its performance in high energy‐demand systems, showing only electrical double layer capacitor (EDLC) behavior with limited energy density. Here, we opted for manganese oxide nanoparticles (Mn 2 O 3 NPs), which reveal high conductivity, optimal size, and structure (21.78 nm and cubical), and high specific capacitance.