Enhanced cathodic electrodes from V2O5 nanorods: Pioneering organic dye degradation and optimized catalysis for sustainable supercapattery devices

Abstract

Encapsulating the essence of multifunctionality, the synthesized Vanadium Pentoxide (V₂O₅) nanorods (NRs) are adaptable innovators of visible-light photocatalytic degradation and sustainable supercapattery device fabrication. Meanwhile, the physicochemical properties are investigated by precise instruments. The V₂O₅ NRs demonstrate improved photocatalytic performance over a 100-min duration, effectively catalyzing the methylene blue (MB) degradation with a remarkable degradation percentage of 98.37 % (25 mg catalysis) and shows a lower wavelength shift due to MB molecular braking. In a groundbreaking twist, this work utilises tainted V₂O₅ NRs, ingeniously repurposing them to energy storage tenacities. In addition, the electrochemical assessment of tainted V₂O₅ NRs demonstrated subtle changes after MB degradation, increasing the specific capacity (C_s) value from 794 to 933C.g⁻¹ due to developing reduced particle agglomeration. Moreover, the better C_s value of tainted V₂O₅ NRs reached 95.02 % after 500 cycles (5 A.g⁻¹). The fabricated asymmetric supercapattery (ASC) device demonstrates superior ion diffusion processes, as evidenced by Dunn's method calculations, particularly at a scan rate of 5 mV.s⁻¹. Additionally, the assembled device underscored their unique positioning between battery and capacitor materials, distinctly supported by a “b” value of 0.8 and superior capacity retentivity. They reached a superior power (P = 191.75 W.kg⁻¹) with energy (E = 50 Wh.kg⁻¹) and better cyclic stability, maintaining their performance over 4000 cycles at 5 A. g⁻¹ (91.3 %). Furthermore, under exposure to the light of a yellow light emitting diode (LED) for 30 s, the real-time consequences of after cyclic stability material of tainted V₂O₅ NRs are investigated, providing meaningful insights into their performance dynamics.