Nickel–Cobalt Sulfide Nanosheets Anchored on Porous Carbon for Energy Storage and Small-Molecule Detection

Transition metal sulfides (TMSs) are considered to be highly promising electrode materials for supercapacitors. Optimizing the structure of the electrode materials to expose more active sites is a crucial strategy for boosting the electrochemical performance. Herein, we developed carbon/metal sulfide composite electrode materials by anchoring nickel–cobalt bimetallic sulfide nanosheets (NCS) on chitosan-derived heteroatom-doped hierarchical porous carbon (CPC). The composite materials exhibited a uniform distribution and significantly increased active sites, which led to a substantial enhancement of the electrochemical properties. The optimal sample NCS/CPC-3 exhibited a brilliant capacitive performance and great cycling stability. Also, the assembled asymmetric supercapacitor presented a robust energy output of 37.1 W h kg–1 at 800.0 W kg–1. In addition, NCS/CPC-3 also demonstrated potential in the field of small-molecule detection. Our findings supply a unique perspective on effectively boosting the electrochemical properties of TMS-based electrode materials.