ZIF derived N-CoS2@graphene rhombic dodecahedral nanocomposites: As a high sensitivity sensor for hydrazine

Abstract As a highly toxic substance that may be harmful to the environment and human beings, hydrazine has been paid growing attention in the field of electrochemical detection. Using the organometallic framework as a template and taking advantage of its high porosity, we prepared cobalt disulfide rhombic dodecahedral nanocomposites with nitrogen coordination and graphene coating (N-CoS2@graphene) in this study. Nitrogen coordination can effectively boost the intrinsic activity of the active site by modulating the electronic structure of the Co center in N-CoS2@graphene. The surface graphene layers not only work as protective layers to enhance stability but also promote electron transfer. It has been proved that this electrocatalyst has excellent hydrazine electrochemical sensing performance with a high sensitivity of 1580 μA mM−1 cm−2, a low detection limit of 30 nM at S/N = 3, a linear range from 1.0 μM to 1.0 mM, and satisfactory reproducibility and stability at 0.1 V. It can be seen that this catalyst has a very attractive application prospect in an electrochemical sensor.