Potassium-intervened copper–nickel bimetallic organic framework with a potassium hydrogen phthalate ligand for high-performance aqueous potassium-ion hybrid supercapacitors

CuNi–KHP is synthesized via a solvothermal method (160 °C, 17 h) and fabricated into an electrode with PVDF and carbon for three-electrode testing in 6 M KOH. Achieve 1568.58 F g −1 , 76 Wh kg −1 and 812 Wh kg −1 in hybrid potassium-ion supercapacitors.