0.2CNT/NiSex composite derived from CNT/MOF-74 as electrode material for electrochemical capacitor and electrochemical sensor

Abstract Selenides derived from MOFs have attracted attention as the materials with excellent electrochemical properties. CNT/MOF-74 composites are successfully synthesized by a simple hydrothermal method. Then CNT/Ni-MOF-74 materials are selected as the precursors for further selenization to prepare CNT/NiSex. The results show that 0.2CNT/NiSex derived from CNT/Ni-MOF-74 prepared in the presence of 0.2 g CNTs has the best electrochemical performance as electrochemical capacitor electrode, which exhibits the highest specific capacitance of 2136 F·g−1 at a current density of 1 A·g−1. In addition, a hybrid electrochemical capacitor (HEC) is assembled with 0.2CNT/NiSex and activated carbon (AC). The obtained 0.2CNT/NiSex//AC HEC shows a high energy density of 59 Wh·kg−1 at a power density of 800 W·kg−1. In order to expand the application of the composition material, a 0.2CNT/NiSex/GCE electrochemical sensor is prepared. The results show that 0.2CNT/NiSex/GCE electrochemical sensor can be used for simultaneous determination of acetaminophen (AMP) and dopamine (DA).