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In this study, graphene oxide, lanthanum sulfide and their composite thin films are prepared using simple and inexpensive chemical methods and their supercapacitive performance is evaluated. The X-ray diffraction study shows the formation of mixed-phase lanthanum sulfide with monoclinic α-LaS 2 and tetragonal La 5 S 7. Field emission scanning electron microscopy images show porous surface morphology of lanthanum sulfide and composite thin films. The supercapacitive performance of composite film tested in 1 M Na 2 SO 4 electrolyte shows highest specific capacitance of 312 F g −1 at a 5 mV s −1 scan rate.

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One pot hydrothermal method is used for synthesis of groundnuts-like samarium oxide (Sm 2 O 3) thin film on stainless steel substrate. The Sm 2 O 3 film is characterized by X-ray diffraction, water contact angle, UV-visible spectrophotometer, photoluminescence, and field emission scanning electron microscopy techniques. The hydrothermal method allows the formation of cubic Sm 2 O 3 film with porous groundnuts-like morphology. The Sm 2 O 3 film is hydrophilic with the optical band gap of 3.70 eV. Electrochemical capacitive behavior of Sm 2 O 3 film is studied using cyclic voltammetry, galvanostatic charge-discharge measurement and electrochemical impedance spectroscopy. The Sm 2 O 3 film exhibits maximum specific capacitance of 155 Fg −1 at 5 mVs −1 scan rate in 1 M KOH electrolyte.

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