Abstract
In this paper, the Ni/NiO ultrathin nanobelts were successively synthesized by a facile in suit conversion process using pre-synthesized Ni-based metal-organic frameworks (MOFs) nanobelts as parent materials to detect the nitrite (NaNO2). The synthesized Ni/NiO composites have the advantages in structure, as follows: (I) Interleaved 3D reticulated structure has strong mechanical stability; (II) Ultrathin nanobelt structures allow more active sites to be exposed and make the transfer of charge faster; (III) A large number of ultrafine Ni nanoparticles decorate the building blocks of the NiO nanobelt and enhance the electrical conductivity. Ni/NiO/GCE has an obvious oxidation peak at 0.78 V, when the concentration is between 0.5 and 1000 μM, the oxidation peak current of NaNO2 is linearly related to the concentration, and the sensitivity is 1.5319 μA mM−1 cm−2 (S/N = 3). Moreover, the experimental results also concluded that the Ni/NiO ultrathin nanobelts not only indicated wonderful reproducibility in the determination of NaNO2 in the pickled pork samples, but also could be well-recovered and keep stable for a long time.
Highlights
Metal-organic frameworks (MOFs) are expected to play a significant role in energy applications (Lin et al, 2015; Xia et al, 2015; Tan et al, 2017; Liang et al, 2018; Wu et al, 2019; Yang et al, 2019; Zhao Y. et al, 2019)
We report that, with presynthesized ultrathin Ni-MIL-77 nanobelts as parent materials, a facile in situ conversion way (O2-protected annealing process) has been demonstrated to fabricate metal nickel nanoparticle functionalized NiO composites (Ni/NiO ultrathin nanobelts)
The Ni/NiO composite reported here was made by using an in suit conversion process
Summary
Metal-organic frameworks (MOFs) are expected to play a significant role in energy applications (Lin et al, 2015; Xia et al, 2015; Tan et al, 2017; Liang et al, 2018; Wu et al, 2019; Yang et al, 2019; Zhao Y. et al, 2019). Because the micro/nanoscale structure has a great potential to overcome the disadvantages of low specific surface area (SSAs) and poor contacts of active materials with electrolyte/pollutants compared to conventional bulks or aggregate materials. It is considered as a promising electrode material (Du et al, 2014, 2017; Bosch et al, 2017; Chen et al, 2017; Shi et al, 2017; Li Y.-P. et al, 2019; Xiao et al, 2020). NaNO2 in pickled pork was determined by the Ni/NiO materials, and good recovery was achieved
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