Electrodeposited Vanadium Pentoxide/Polypyrrole as a Highly Efficient and Low Cost Electrode Material for Microsupercapacitor Applications

Recently, supercapacitors have gained significant attention as a highly promising energy storage technology, owing to their exceptional safety, low cost, and eco‐friendliness. Over the past five years, V 2 O 5 has been extensively studied as a cathode material due to its high theoretical capacity, multielectron redox capability and stable layered structure. Despite these advantages, its relatively low electronic conductivity leads to poor rate capability and necessitates the use of conductive additives. To address these limitations, various modification strategies have been developed to improve the electrochemical and overall performance of V 2 O 5 cathodes. The V 2 O 5 /polypyrrole composite was fabricated through in situ oxidative polymerization of polypyrrole (PPy) on an electrodeposited V 2 O 5 electrode. Benefiting from the synergistic interaction between the two components, the device demonstrates significantly enhanced electrochemical performance. It operates within a voltage window of 0‐1.6 V and delivers an areal capacitance of 90 mF/cm 2 at 2 mV/s, along with excellent rate capability. Moreover, the device shows remarkable cycling stability, retaining 93% of its initial areal capacitance after 5000 cycles.