In situ formation of a carbon fiber@Ni3S2 non-woven electrode with ultrahigh areal and volumetric capacitance

A carbon fiber@Ni3S2 non-woven structured electrode was prepared by electroplating a nickel layer on the surface of carbon paper fibers, and then carbon fiber@Ni3S2 was in situ formed by a vulcanization reaction. The Ni3S2 layer shows ultrahigh volume/area capacitance, 911 F cm(-3)/15.5 F cm(-2), which is 4 times higher than published data, and displays good cycle performance.