Construction of hollow NiCo-LDH nanocages for electrochemical sensing of hydrazine based on template etching strategy

Abstract

The improper use of hydrazine (N2H4) will cause serious pollution to the environment and harm to human health. It is essential to establish a rapid and sensitive detection method for N2H4 in the environment. In this study, NiCo-LDH self-assembled hollow nanocages (HNCs) are prepared by in-situ etching using Cu2O nanocube as precursor template. The unique hollow nanocage structure can significantly increase the active site of the catalyst, which is beneficial for ion transfer and charge transport, thereby improving the electrocatalytic performance of the N2H4 sensor. The detection linear range is 3 × 10−3 mM −2 mM and 3 μM to 6 mM, and the detection limit (LOD) is 0.135 μM (S/N = 3). Additionally, it shows good selectivity, reproducibility and stability. The constructed novel N2H4 electrochemical sensor has potential application prospects in environmental water samples.