MoS2 powder (<2 μm) purchased from Sigma-Aldrich was first ball-milled with 20 weight % (wt %) carbon black and 10 wt % polyvinylidene difluoride (binder) in N-methylpyrrolidone for 2 hours in a Fritsch Pulverisette 6. The well-mixed homogeneous slurry was then spread onto a copper foil using a doctor blade spreader and dried at 110°C overnight in a vacuum oven. The foil with electrode materials was then punched into circular disk electrodes about 14 mm in diameter, with ~1.7 mg of MoS2. The active electrodes, along with a polyethene separator, the electrolytes, and Na counter electrodes, were assembled into a CR2032-type coin cell. The electrolyte is 1 M NaClO4 in ethylene carbonate/diethyl carbonate (1:1). All cell assemblies were operated in an argon-filled glove box. Galvanostatic charge-discharge cycling was performed on a Solartron 1470E Multichannel Potentiostat/CellTest System.

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