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We introduce an asymmetric supercapacitor composed of graphene wrapped yolk-double shell NiGa2S4 as a cathode, and graphene wrapped FeS2–FeSe2 core–shell as an anode.

A facile strategy is developed to construct graphene-encapsulated multi-shelled zinc–cobalt-selenide hollow nanospheres and graphene-encapsulated yolk–double shell cobalt–iron-selenide hollow nanospheres for asymmetric supercapacitors.

An effective strategy is developed to synthesize graphene-wrapped NiGa2O4, and graphene-wrapped NiFe2O4 for supercapacitors.

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