Freeze-dried MoS2 sponge electrodes for enhanced electrochemical energy storage

Abstract

In the present study, we have synthesized high surface area MoS₂ sponge electrodes via a facile hydrothermal method followed by a freeze drying process. The performance of the MoS₂ based symmetric capacitor showed a high specific capacitance value of around 128 F g⁻¹ at a scan rate of 2 mV s⁻¹, and also a single electrode showed a specific capacitance of 510 F g⁻¹, which is a remarkable value to be reported for a MoS₂ based material in a symmetric device configuration. Also, a high energy density of around 6.15 Wh kg⁻¹ and a good cyclic stability over 4000 cycles are obtained for the symmetrical cell.