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0.112g of MoS2 was added to 10mL of 20 M NaOH solution to prepare solution A. The solution B was prepared by adding
NaBH4 to 10 mL of 20 M NaOH solution and magnetically stirring at 50 ̊C for 30 min. The A solution was then added dropwise
to the B solution for 60 min. The solution was poured into a Teflon-lined autoclave (30 mL) and kept at 150 ̊C for 10 hours, and then
the black powder was washed three times.
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