Tulip-like MoS2 with a single sheet tapered structure anchored on N-doped graphene substrates via C-O-Mo bonds for superior sodium storage

Tulip-like MoS2 with a tapered structure was assembled using a single-sheet anchored on N-doped graphene substrates (tulip-MoS2/NG) through an in situ technique with N-methyl-2-pyrrolidinone (NMP) as the sacrificial agent to promote C-O-Mo bond formation. As an anode for the Na+ battery, tulip-MoS2/NG electrodes exhibited excellent capacity retention (above 99% after 100 cycles at 0.1 A g(-1)) and long cycling stability (179 mA h g(-1) at 1 A g(-1) and 151 mA h g(-1) at 5 A g(-1) after 1000 cycles with a degradation below 110 Ah g(-1) cycle(-1)). The excellent electrochemical performance could be attributed to the single-sheet tapered structure that functions as a self-support and promotes the stability of the tulip-MoS2/NG architecture. Moreover, the C-O-Mo bonds derived from the NMP molecular bridge fixed tulip-like MoS2 on the NG.