Tracking Pseudocapacitive Contribution to Superior Energy Storage of MnS Nanoparticles Grown on Carbon Textile

Transition metal chalcogenides have emerged as a new class of electrode-materials for energy storage devices with superior electrochemical performance. We have directly synthesized manganese sulfide rianopartides on carbon textile substrate and used them as electrodes to fabricate flexible all-solid-state supercapacitors. By voltammetry analysis, we have studied the electrochemical,propertiesof MnS-CT composites, which reveal that the Faradaic diffusion-controlled process dominates at low scan rates (82.85% at 5 mV s(-1)) and even at high scan rates (39% at 20 mV s(-1)). The MnS-CT electrode shows high capacitance of 710.6 F g-1 in LiC1 aqueous electrolyte, and the surface redox reactions on MriS nanoparticles are found to :be responsible for the high pseudocapacity,: which is-further analyzed by XRD and HRTEM. Furthermore, MnS-CT supercapacitor exhibits excellent psetidocapacitive performance (465 Pg-1 at 5 mV s-1), excellent stability, light weight (0.83 g as a whole device), and high flexibility. The device has also achieved high energy density and high power density (52 Wh kg(-1) at 308 W kg-i and 1233 W kg-1 with 28 Wh kg(-1), respectively). In practice, three charged supercapacitors in series can power four red light-emitting diodes (LEDs) (2.0 V, 15 mA) for 2 min. All of the evidence shows that MnS nanoparticles combined' with carbon textile is a promising electrode material for pseudocapacitors.