A novel chemical synthesis and characterization of Mn_3O_4 thin films for supercapacitor application

摘要

Mn_3O_4 thin films have been prepared by novel chemical successive ionic layer adsorption and reaction (SILAR) method. Further these films were characterized for their structural, morphological and optical properties by means of X-ray diffraction (XRD), Fourier transform infrared spectrum (FTIR), field emission scanning electron microscopy (FESEM), wettability test and optical absorption studies. The XRD pattern showed that the Mn_3O_4 films exhibit tetragonal hausmannite structure. Formation of manganese oxide compound was confirmed from FTIR studies. The optical absorption showed existence of direct optical band gap of energy 2.30 eV. Mn_3O_4 film surface showed hydrophilic nature with water contact angle of 55°. The supercapacitive properties of Mn_3O_4 thin film investigated in 1 M Na_2SO_4 electrolyte showed maximum supercapacitance of 314 F g~(-1) at scan rate 5 mV s~(-1).