Microplasma-assisted construction of cross-linked network hierarchical structure of NiMoO4 nanorods @NiCo-LDH nanosheets for electrochemical sensing of non-enzymatic H2O2 in food.

The accumulation of small doses of hydrogen peroxide (H₂O₂) into food can cause many diseases in the human body, and it is urgent to develop efficient detection methods of H₂O₂. Herein, the hierarchical structure composite of NiCo-LDH nanosheets crosslinked NiMoO₄ nanorods was grown in situ on carbon cloth (NiMoO₄ NRs@NiCo-LDH NSs/CC) by micro-plasma assisted hydrothermal method. Thanks to the synergistic effect of three metals and (NiMoO₄ NRs@NiCo-LDH NSs/CC) provided by nanorods/nanosheets hierarchical structure, NiMoO₄ NRs@NiCo-LDH NSs/CC exposes more active sites and achieves rapid electron transfer. The H₂O₂ electrochemical sensor was constructed as the working electrode with a linear range of 1 μmol L^-1 to 9.0 mmol L^-1 and detection limit of 112 nmol L^-1. In addition, the sensor has been successfully applied to the detection of H₂O₂ in food samples, the recovery rate is 95.2%-106.62%, RSD < 4.89%.