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Metal–organic framework‐derived NiCo2.5S4 microrods wrapped in reduced graphene oxide (NCS@RGO) were synthesized for potassium‐ion storage. Upon coordination with organic potassium salts, NCS@RGO exhibits an ultrahigh initial reversible specific capacity (602 mAh g−1 at 50 mA g−1) and ultralong cycle life (a reversible specific capacity of 495 mAh g−1 at 200 mA g−1 after 1 900 cycles over 314 days)...
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