Organic cation linkers polyoxomolybdate-polypyrrole nanocomposite-based supercapacitors

A few new hybrid electrode materials have been synthesized and immobilized for the next-generation energy storage device. The hybrid electrodes PVMo₁₁-TBA, PVMo₁₁-BTA, PVMo₁₁-TBP, PVMo₁₁-TBA-PPy, PVMo₁₁-BTA-PPy, and PVMo₁₁-TBP-PPy were well characterized by NMR, XRD, FTIR, FESEM, BET, and tested for electrochemical performance. Among these hybrid electrode materials, the PVMo₁₁-TBA-PPy electrode shows a high specific capacitance of 144.37 F/g at a 1A/g current density and incredible power and energy density of 1100.16 W/kg and 15.28 Wh/kg, respectively. The high electrode’s capacitance was due to the synergistic effect between the PPy and TBA-PVMo₁₁ and high ionic diffusion compared with other synthesized electrodes. It also exhibited high cycle stability of 72.78% after 4500 cycles at 1 M H₂SO₄ electrolyte. The EIS offers a lower ESR value of 0.72 ohms for the PVMo₁₁-TBA-PPy than PVMo₁₁-TBA, indicating the rapid charge/discharge rate. On the other hand, the PVMo₁₁-BTA-PPy and PVMo₁₁-TBP-PPy electrodes showed lower capacitance values of 26.98 and 19.53. F/g at 0.4 and 1 A/g current density, respectively. Lowering the capacitance could be the prevention of the interaction of organic cations with the counter polyanion.