Highly sensitive nonenzymatic H2O2 sensor based on NiFe-layered double hydroxides nanosheets grown on Ni foam

Abstract

Here, NiFe-LDH grown on Ni foam was successfully synthesized through a facile one-step hydrothermal approach and then directly applied as the electrode for nonenzymatic H2O2 sensor. The structure and morphology, of the as-synthesized NiFe-LDH were firstly characterized by X-ray diffraction (XRD), scanning electronic microscopy (SEM) and transmission electron microscopy (TEM). It is found that NiFe-LDH nanosheets assemble differently on inner and outer Ni foam with different Fe contents. The subsequent electrochemical measurements showed that the NiFe-LDH/Ni foam electrode exhibited remarkable electrocatalytic activity towards H2O2 oxidation with a high sensitivity of 1704 µA mM−1 cm−2 (0.5 µM to 0.84 mM) and low limit of detection (0.5 µM). These impressive performances indicate that the NiFe-LDH nanosheets is a promising candidate for nonenzymatic H2O2 sensors.