Rational design of MXene/activated carbon/polyoxometalate triple hybrid electrodes with enhanced capacitance for organic-electrolyte supercapacitors

• POMs were nano-dispersed within MXene with assistance of AC matrix. The hybrid combined the merits and compensate for demerits each component. Gravimetric capacitance was 2.2 times that MXene. remained anchored in long-term leading to great cycle stability. Hybrid's asymmetric cells outperformed AC//MXene by weight volume. We report a triple electrode (MXene/activated carbon (AC)/polyoxometalates (POMs)) combining three materials: (high volumetric capacitance), gravimetric capacitance) Phosphotungstate (fast redox). Phosphotungstic acid (HPW12) tetraethylammonium phosphotungstate (TEAPW12) two used prepare MXene/AC/POMs hybrids. MXene/AC/TEAPW12 MXene/AC/HPW12 1 M tetrafluoroborate (TEABF4)/acetonitrile. Nano-dispersion facilitates charge storage through surface capacitive processes (91% at 2 mV s ?1 ). delivered significantly higher (87F g ) than (40F same organic electrolyte, without sacrificing much (less 10%). similar MXene/AC, whereas its 1.5 higher. Replacing TEA cations 1-ethyl-3-methylimidazolium (EMIM + ), improved 21%. Coupled positive electrodes an cell, 4.6 energy density 3.5 cell relatively high-power densities. This study proves combines compensates component is promising material organic-electrolyte supercapacitors.