All Redox‐Active 2D MXene and 0D Phosphomolybdic Acid Nanoclusters‐Anchored Polypyrrole Nanotubes for High‐Performance Aqueous Hybrid Supercapacitors

Abstract

The construction of a hybrid supercapacitor (HSC) with 2D Ti3C2Tx MXene anode is restricted by the scarcity of promising cathode materials that can demonstrate the superior electrochemical features in protic electrolytes. To circumvent this issue, we demonstrate an innovative high‐performance HSC cell in a protic electrolyte by combining a redox‐active 0D phosphomolybdic acid (PMo12) nanoclusters‐anchored polypyrrole nanotubes (PMo12/PPyNT) cathode against the pseudocapacitive Ti3C2Tx MXene anode. Decorating PMo12, a Keggin‐type polyoxometalates material known for their high redox activities on polypyrrole nanotubes (PPyNT) resulting in a nanocomposite that matches the electrochemical performance of MXene in a protic electrolyte so that a high‐performance HSC cell can be acquired. The gathered PMo12/PPyNT//MXene HSC cell delivers the specific energy (36.1 Wh/kg) and specific power (6.66 kW/kg) superior to the state‐of‐the‐art MXene‐based supercapacitor (SC) cells. The cell also exhibits impressive coulombic efficiencies over various current densities and adequate stability over 5000 charge‐discharge cycles. These results show that combining polyoxomolybdate‐based cathode materials against the MXene anode can overcome the boundaries associated with the existing HSC cells.

Carbon Nanomaterials Made from Supramolecular Hybridization of Cucurbit[6]uril with Phosphomolybdic Acid for Supercapacitors

“…As illustrated in Figure d, the highest energy density (36.03 W h kg –1 ) was achieved on the SSC device at 560 W kg –1 power density and 0.2 A g –1 current density. These values are comparable to literature reports for PMA-doped materials, − with the advantage that we report a much simpler synthetic strategy and higher energy density (Table S7). Therefore, the materials presented in this paper could be promising in using SC electrodes.…”