Self-supporting nickel-doped V2O5 nanoarrays as bifunctional electrodes for wearable aqueous zinc-ion batteries and pressure sensors

Vanadium pentoxide (V 2 O 5 ), due to its distinctive open-framework construction and significant theoretical capacity, has widespread applications in the rapid development of aqueous zinc-ion batteries (AZIBs) and pressure sensors. However, V 2 O 5 exhibits rapid capacity degradation and poor cycling stability due to its low electrical conductivity and ion diffusion rate, limiting its vast application prospects. Therefore, the self-supporting V 2 O 5 nanoarrays employing a Ni doping strategy on flexible carbon substrates act as an AZIBs cathode material (Ni–V 2 O 5 @CNTF), which possesses an enlarged interlayer space and high ion conductivity to provide a stable crystal structure for fast and reversible Zn 2+ insertion/extraction. More notably, the assembled Zn/Ni–V 2 O 5 @CNTF battery achieves a high capacity of 398.85 mAh cm −3 at 0.1 A cm −3 , superior rate performance and cycling stability for 2000 cycles. In addition, the V 2 O 5 nanoarrays grown on carbon cloth serving as the functional electrode material (Ni–V 2 O 5 @CC) are applied in a flexible resistive pressure sensor, exhibiting a high sensitivity of 0.8 kPa −1 from 0 to 5.0 kPa and stable sensing capabilities from 0 to 25 kPa. Furthermore, extensive applications are investigated in monitoring human activities and anti-intrusion pre-alarm systems. This work demonstrates a dual-functional fabric electrode based on Ni–V 2 O 5 , offering new guidelines for the next generation of multifunctional flexible electronic products.