Peeyush Pandey, Mohammad Qureshi
ABSTRACT Spin control for interfacial charge/mass transport plays a decisive role in achieving elevated energy density while retaining power density in a hybrid supercapacitor. Interfacial charge‐transfer improvisations by push‐pull spin control strategy among two magnetically distinctive materials offer a unique way to enhance the intrinsic characteristic of the electrode. Herein, we present a push‐pull strategy at the intersection of soft/hard magnetic spin junction, where spin‐ordering in soft magnetic (SM) Co(1,4‐benzenedicarboxylate) (CBDC) layer is induced by hard magnetic (HM) MnFe 2 O 4 (MFO) nanoparticle under the influence of an external magnetic field. Specific capacitance of CBDC‐MFO@CSF electrode is increased from 612 to 1015 Fg −1 , capacitance retention from 30% to 50% across a 1.6 V operating range, from magnetically induced ferromagnetic ordering in CBDC layer activating more Co 2+ sites and facilitating charge/mass transport for superior charge storage. When 0 and 18 mT activated electrodes are assembled into a hybrid device, the energy density of the magnetically activated electrode is increased to 146 Whkg −1 @ 800 Wkg −1 compared to a non‐magnetically activated electrode (81 Whkg −1 @ 798.4 Wkg −1 ) without compromising power output. Improvement in mass/charge transport for the magnetically activated electrode suggests a direct consequence of the induced spin ordering and pinning, which favors enhanced diffusion dynamic control at the electrode‐electrolyte interface.