Preparation and electrochemical properties of bimetallic Nd/Ni organic framework compounds
[Introduction] Bimetallic organic framework compounds (MOFs) doped with rare earth element generally feature excellent electrochemical properties. [Method] A NdNi-MOFs material of prismatic structure were prepared by solvothermal method with Nd and Ni as ion sources and trimesic acid (BTC) as organic ligand. The electrochemical properties of NdNi-MOFs were studied by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) measurement, and electrochemical impedance spectroscopy (EIS). [Results] The specific capacitance of NdNi-MOFs electrode was up to 1280 F/g at a current density of 1 A/g, and maintained at 1145 F/g with a capacitance retention rate of 88.3％ even after 5000 cycles of galvanostatic charging/discharging at a current density of 8 A/g. The symmetric capacitor consisting of NdNi-MOFs electrodes featured an energy density of 175 W·h/kg at a power density of 204.2 W/kg, indicating that it had good cyclic stability during the charge/discharge process. [Conclusion] NdNi-MOFs are expected to be used as an electrode material for capacitors, batteries, and so on.
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