Constructing high-performance supercapacitors and electrochemical water splitting electrode materials through core–shell structured Co9S8@Ni(OH)2nanosheets

The material demonstrates a specific capacitance of 844.8 C g −1 at a current density of 1 A g −1 . In addition, the hydrogen evolution reaction performance of the material is 92.7 mV at 10 mA cm −2 , with a Tafel slope of 147.86 mV dec −1 .