Ultrathin NiCo2S4@graphene with a core–shell structure as a high performance positive electrode for hybrid supercapacitors

Herein we demonstrate a facile method for the synthesis of a NiCo₂S₄/graphene composite where NiCo₂S₄ is encapsulated with an ultrathin graphene layer to form a core/shell structure (NiCo₂S₄@G).