Controllable one step electrochemical synthesis of PANI encapsulating 3d-4f bimetal MOFs heterostructures as electrode materials for high-performance supercapacitors

Two new 3-dimensional (3D) 3d-4f bimetal organic frameworks (ZnCe-MOF and CuCe-MOF) were created through hydrothermal method. These MOFs have the similar formula (M-2(imidazole)(2)Ce(H2O)(C2O4)(1/2)(4,5-ida)(2)center dot 2(H2O), M = Zn, Cu; 4,5-ida: 4,5-imidazole dicarboxylate) and possesses monoclinic symmetry in the P2(1)/n space group. The electrodeposition method was used to in-situ coat polyaniline (PANI) to improve the electrical conductivity. As the electrode materials for supercapacitors in three-electrode system, the specific capacitance of CuCe-MOF@PANI-1 and ZnCe-MOF@PANI-1 electrodes can reach 724.4F g(-1) and 713.2F g(-1) at 1 A g(-1). Using the as-synthesized CuCe-MOF@PANI-1 heteorostructure as positive material, the assembled hybrid capacitor delivers an energy density of 87.45 Wh kg(-1) and 58.05 Wh kg(-1) at power density of 850 W kg(-1), demonstrating that the heteorostructure of MOF coated with PANI has promising applications in portable energy storage devices.

Automated summary

Two new 3D 3d-4f bimetal organic frameworks (ZnCe-MOF and CuCe-MOF) were synthesized through hydrothermal method. These MOFs have monoclinic symmetry in the P2(1)/n space group and were coated with PANI using the electrodeposition method to improve electrical conductivity. The heterostructure of MOF coated with PANI shows promising applications in portable energy storage devices, with specific capacitance reaching up to 724.4F g(-1) and 713.2F g(-1) at 1 A g(-1).