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Hollow MoO2 spheres anchored on nitrogen-doped graphene (H-MoO2@rGO) are synthesized with an in situ self-assembly approach. The hollow structure could provide sufficient space to accommodate the volume variation of MoO2 during the discharge-charge process, thus improving the cycling stability. Nitrogen-doped graphene can accelerate the charge transfer. Moreover, the graphene and MoO2 are proved to...
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