Suppressing the metal-metal interaction by CoZn0.5V1.5O4 derived from two-dimensional metal-organic frameworks for supercapacitors

Co2VO4 with Co tetrahedrons and octahedrons of transition metal oxides has achieved progress in electrocatalysts batteries. However, high metal-metal interactions make it challenging to maintain reactivity as well increase the conductivity stability supercapacitors. In this work, spinel-structured CoZn0.5V1.5O4 a specific surface area was synthesized through an ion-exchange process from metal-organic frameworks zinc-cobalt. Density functional theory calculations indicate that replacement by Zn can decrease interaction between metals, leading downshift ?*-orbitals (V-O) half-filled a1g orbitals near Fermi level, thus increasing CoZn0.5V1.5O4. As supercapacitor electrode, exhibits cycling durability (99.4% capacitance retention after 18,000 cycles) (1100 mF cm?2 at 1 mA cm?2). This work provides possibility designing octahedral tetrahedral sites improve their electrochemical performance.