BiCo-MOF@NiO/PANI/rGO composite electrode with enhanced conductivity and stability for hybrid supercapacitor and HER applications

초록

A novel electrode material, BiCo-MOF@NiO/PANI/rGO, was prepared through a low-cost hydrothermal method. The crystallinity and surface morphology were analyzed using XRD and SEM, and the BET study confirmed a specific surface area of 314 m2/g. Electrochemical testing showed that BiCo-MOF@NiO/PANI/rGO (B2) delivered a high specific capacity (Qs) of 431.66 mAh g- 1 at 1.5 A g- 1, which is significantly greater than that of BiCoMOF@NiO (100.08 mAh g- 1) and BiCo-MOF@NiO/PANI (242.95 mAh g-1). Under a two-electrode asymmetric configuration, the device attained a Qs of 132.37 F/g at 0.7 A/g and maintained 83.3 % capacity after 10,000 cycles. It also offered a high energy density of 81.2 Wh kg- 1 and a power density of 2695.7 W kg- 1. In addition to energy storage capabilities, the material exhibited notable electrocatalytic behavior for the HER, with a low Tafel slope (Ts) of 47.62 mV dec- 1. The outcomes highlight the composite's potential as a multifunctional material for both energy storage and electrocatalysis, paving the way for next-generation sustainable technologies.

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