Synthesis of Highly Dispersed CuPd@UiO-66-NH 2 for Nonenzymatic Hydrazine Sensing

In this article, a core–shell CuPd@UiO-66-NH 2 composite material was synthesized by a double-solvent reduction method, and an N 2 H 4 electrochemical sensor based on CuPd@UiO-66-NH 2 was constructed. The relationship between the morphology, type, composition, size of the sensor interface composite material and its electrocatalytic performance and sensor response performance was studied, and a new method for detecting N 2 H 4 was established. The surface properties and composition of the materials were studied by transmission electron microscope(TEM),energy dispersive X-ray spectroscopy(EDX) and X-ray diffraction spectroscopy(XRD). The results showed that the synthesized CuPd@UiO-66-NH 2 has a regular 3D structure, particle dispersion, and uniform particle size, the particle size is about 90 nm. Electrochemical performance studies showed the sensor is made into detecting N 2 H 4 in a linear range of 0.25 μ M ∼ 1.39 mM, with a sensitivity of 386.7 μ A·mM −1 ·cm −2 , and a detection limit of 0.08 μ M(S/N = 3). Compared with other electrochemical sensors based on metal nanoparticles to detect N 2 H 4 , the new sensor exhibited a wider linear range; and its sensitivity was 3 times of that obtained by the Cu-BTC/OMC/GCE. So, the sensor can be used as a potential sensing material to detect hydrazine.