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[Display omitted] • CNT/MOF-74 materials are prepared and their electrochemical properties compared. • CNT/Ni-MOF-74 derived 0.2CNT/NiSe x has excellent electrochemical performance. • 0.2CNT/NiSe x is used for not only supercapacitors but also electrochemical sensors. • CNTs improve specific capacitance and conductivity of the composite simultaneously. 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/NiSe x. The results show that 0.2CNT/NiSe x 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/NiSe x and activated carbon (AC). The obtained 0.2CNT/NiSe x //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/NiSe x /GCE electrochemical sensor is prepared. The results show that 0.2CNT/NiSe x /GCE electrochemical sensor can be used for simultaneous determination of acetaminophen (AMP) and dopamine (DA). [ABSTRACT FROM AUTHOR]