Synthesis of MnS microfibers for high performance flexible supercapacitors

Abstract

Cubic MnS thin films are prepared at 358K bath temperature using chemical bath deposition (CBD) method. MnS phase of manganese sulfide is identified with X-ray diffraction (XRD) and X-ray photoemission spectroscopy analyses. Interconnected porous microfibers like surface texture of MnS thin film is evaluated through field-emission scanning electron microscopy (FE-SEM). Specific surface area of 120.42m2g−1 is measured with Brunauer-Emmett-Teller (BET) technique. The highest specific capacitance (Cs) of 747Fg−1 is obtained using galvanostatic charge discharge (GCD) technique at 1mAcm−2 current rate. Excellent 85% capacity retention is obtained after 2 000CV cycling at 100mVs−1 scan rate. All solid state flexible (ASSF) symmetric supercapacitor devices based on microfiber-MnS thin films are prepared using cost effective stainless steel substrate and PVA-KOH gel electrolyte and practical application is demonstrated by illumination of red LED.