Self-supported loofah-like Co(OH)F@NiMn-LDH hierarchical core–shell nanosheet arrays as efficient electrocatalyst for hydrazine sensing

Abstract

As a highly toxic substance that is harmful to the environment and human health, hydrazine (N2H4) has attracted more and more attention in the field of electrochemical detection. In this work, a loofah-like NiMn-LDH in situ grown on weed-like Co(OH)F with hierarchical core–shell nanosheet arrays structure on cloth (Co(OH)F@NiMn-LDH NSA/CC) was constructed by a simple two-step hydrothermal method combined with morphological regulation. Electrochemically reactive active sites with higher exposure, and a conductively stable 3D framework for barrier-free diffusion and transport of ions. As an efficient catalyst, the loofah-like Co(OH)F@NiMn-LDH NSA/CC have excellent electrochemical sensing performance at low operating potential (0.65 V) with sensitivity of 2850 μA mM−1 cm−2 and linear range of 2 × 10-3 mM to 7 mM, detection limit is 2.1 × 10-4 mM (S/N = 3). The sensor was successfully used to detect hydrazine in various environmental water samples, indicating that the electrocatalyst has excellent application prospects in electrochemical hydrazine sensors.