Journal of Power Sources 321 (2016) 112-119.
Mechanically delaminated few layered MoS2 nanosheets based high performance wire type solid-state symmetric supercapacitors
Karthikeyan Krishnamoorthy a, Parthiban Pazhamalai a, Ganesh Kumar Veerasubramani a, Sang Jae Kim a, b, *
Two dimensional nanostructures are increasingly used as electrode materials in flexible supercapacitors
for portable electronic applications. Herein, we demonstrated a ball milling approach for achieving few
layered molybdenum disulfide (MoS2) via exfoliation from their bulk. Physico-chemical characterizations
such as X-ray diffraction, field emission scanning electron microscope, and laser Raman analyses
confirmed the occurrence of exfoliated MoS2 sheets with few layers from their bulk via ball milling
process. MoS2 based wire type solid state supercapacitors (WSCs) are fabricated and examined using
cyclic voltammetry (CV), electrochemical impedance spectroscopy, and galvanostatic charge discharge
(CD) measurements. The presence of rectangular shaped CV curves and symmetric triangular shaped CD
profiles suggested the mechanism of charge storage in MoS2 WSC is due to the formation of electrochemical
double layer capacitance. The MoS2 WSC device delivered a specific capacitance of 119 mF cm1,
and energy density of 8.1 nWh cm1 with better capacitance retention of about 89.36% over 2500 cycles,
which ensures the use of the ball milled MoS2 for electrochemical energy storage devices.