ZIFs-derived Hollow CoS₂/N-doped Mesoporous Graphite Carbon Nanocages as an Electrochemical Sensing Platform for Hydrazine Detection in Food

Abstract

The design and construction of a promising electrode is attractive for the sensitive and selective detection of hydrazine. Here, hollow CoS2/N-doped mesoporous graphite carbon nanocages (CoS2/HNGC) were synthesized derived from ZIF-8@ZIF-67 by annealing and sulfidation. In situ nitrogen coordination and self-compounding porous carbon with hollow structure can effectively improve electrocatalytic performance and electron transfer rate of catalyst electrode. The sensor has good performance for hydrazine with a wide linear range of 1 μM - 3 mM, high sensitivity of 2384 μA mM-1 cm-2, and detection limit of 0.272 μM (S/N = 3). In addition, the fine selectivity and the application of this sensor in food hydrazine detection suggest that CoS2/HNGC can be used as an efficient electrochemical detection material for hydrazine.

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

“…38–0715), [27] respectively, while the other two peaks around 44.2° and 51.5° belong to metallic Co (JCPDS No. 15‐0806) [28] . The Raman spectrum displays two distinct vibrational peaks near 1338 cm −1 and 1577 cm −1 , corresponding to the D and G peaks, respectively, indicating the presence of disordered and graphitic carbon (Figure 2b).…”

“…15-0806). [28] The Raman spectrum displays two distinct vibrational peaks near 1338 cm À 1 and 1577 cm À 1 , corresponding to the D and G peaks, respectively, indicating the presence of disordered and graphitic carbon (Figure 2b). Due to the introduction of NiCo-LDH structure, the intensity ratio (I D /I G ) of peak D to peak G increased from 0.93 of Co-NC to 1.02 of Co-NC@NiCo-LDH (Figure 3b), indicating an increase in structural disorder and lattice defects after growing NiCo-LDH.…”