The rough spherical-shaped cerium metal-organic framework (Ce-MOF) is synthesized by using solvothermal technique, and after being calcined at 550 °C both with and without tannic acid, CeO 2 and C@CeO 2 are produced. As synthesized Ce-MOF, CeO 2 , and C@CeO 2 are constructed as anodes for lithium-ion batteries (LIBs), also Ce-MOF and C@CeO 2 are investigated for use in supercapacitors. In the case of LIBs, as anode, C@CeO 2 exhibits a good reversible discharge capacity of 137 mAh g À 1 with 99 % coulombic efficiency over 250 cycles at 1 C rate. It demonstrates that the conductivity is greatly improved by the carbon covering than the pristine CeO 2 and Ce-MOF. After the galvanostatic charge-discharge technique at 1 C rate, the morphology size was investigated using FESEM to conform further the following alloying and dealloying mechanism of C@CeO 2 and the dissolution of terephthalic acid (TPA) in the non-aqueous electrolyte that is connected to the core structure of Ce-MOF. In terms of supercapacitors, rough surface morphology improves the electrode electrolyte conduct also the ligand TPA of free terminal acid group attracting K + and forms the COO À K + . Thus, Ce-MOF exhibits a good specific capacitance; after 5000 cycles, it produces 118 F g À 1 at 4 A g À 1 .with 65.2 % capacitance retention. The archived maximum power and energy density outcomes of 10.6 kW kg À 1 and 0.56 Wh kg À 1 at 2 A g À 1 .
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