NiCo‐LDH coupled with 2D ZIF‐derived Co nitrogen doped carbon nanosheet arrays as a self‐supporting electrocatalyst for detection of formaldehyde

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Abstract
Formaldehyde is susceptible to illegal addition to foodstuffs to extend their shelf life due to its antimicrobial, preservative and bleaching properties. In this study, a self‐supporting “nanosheet on nanosheet” arrays electrocatalyst with core‐shell heterostructure was prepared in situ by coupling NiCo layer double hydroxide with 2D ZIF derived Co‐nitrogen‐doped porous carbon on carbon cloth (Co−N/C@NiCo‐LDH NSAs/CC). Co−N/C nanosheet arrays act as a scaffold core with good electrical conductivity, providing more NiCo‐LDH nucleation sites to avoid NiCo‐LDH agglomeration, thus having fast mass/charge transfer performance. While the NiCo‐LDH nanosheet arrays shell with high specific surface area provide more active sites for electrochemical reactions. As an electrocatalytic sensing electrode, Co−N/C@NiCo‐LDH NSAs/CC has a wide linear range of 1 μM to 13 mM for formaldehyde detection, and the detection limit is 82 nM. Besides, the sensor has been applied to the detection of formaldehyde in food samples with satisfactory results.
Funding Information
  • Key Lab of Process Analysis and Control of Sichuan Universities of China (GCFX2023005)

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