Preparation and electrochemical properties of V₃O₇@PANI composition with core-shell architecture

V 3 O 7 ⋅H 2 O is a new energy storage material with great potential for application, which has a higher theoretical capacitance and was considered to be the most promising electrode material. However, its inherent structural instability and inferior energy storage capacity remain critical bottlenecks impeding practical advancement. In this work, a novel two-dimensional V 3 O₇⋅H 2 O@PANI heterostructured composite was developed via a sequential synthetic protocol, integrating hydrothermal synthesis of V 3 O₇⋅H 2 O nanolayers with in-situ oxidative polymerization for PANI surface functionalization. Moreover, the optimal performance composite was obtained by adjusting the ratio between V 3 O 7 ⋅H 2 O and PANI (1:1, 1:3 and 1:5). Experimental results demonstrate that the V 3 O₇⋅H 2 O@PANI (1:3) composite exhibits superior electrochemical performance, attributed to the synergistic enhancement from the integrated components. Specifically, this composite delivers an impressive capacity (363 F/g at a current density of 0.5 A/g), coupled with remarkable cycling durability (approximately 70% capacitance retention). In conclusion, the V 3 O 7 ⋅H 2 O@PANI as the electrode material with core-shell structure was prepared by in-situ polymerization for supercapacitors, which was feasible and also opened up new thinking for the field of energy storage materials.