Solvent-assisted ligand exchange as a post-synthetic surface modification approach of Zn-based (ZIF-7, ZIF-8) and Co-based (ZIF-9, ZIF-67) zeolitic frameworks for energy storage application

•Two Zn-based and two Co-based MOFs have synthesized by mechanical method.•Solvent assisted ligand exchanged used for surface modification of each ZIFs.•ZIF67@ZIF-9 was selected as best electrode with specific capacitance of 300F/g.•Asymmetric device reached to capacitance retention of 89 % after 3,000 cycles.