Abstract
Cobalt-nickel hybrid materials have multiple morphologies and multiple valence states and therefore have high electrochemical activity. Here we prepared Co-Ni precursor microspheres with hollow structure by homogeneous precipitation. This method is simple and rapid and requires neither the presence of a template compound nor high temperature/pressure conditions. Furthermore, the reaction only uses urea as a precipitation reactant; its decomposition products are water and ammonia, so the entire preparation process is green and environmentally friendly. Structural and compositional analyses revealed that the precursor has a micro-nano layered structure with a composition of [MCO3]x·[M (OH)2]y·nH2O (M = Co, Ni; x,y,n = 1–5). Furthermore, the precursor has a good electrochemical activity for dopamine and a wide linear range (10 μM–0.5 mM). These results indicate that the precursor can be used for dopamine electrochemical sensing.
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Acknowledgment
Besides, we would like to thank the Zhang Yanlin team of Nanjing University of Information Science and Technology for their support. Here, we pay tribute to Dr. Li Wenliang, who died in Wuhan pneumonia (time of death: 2.6, 2020 21:30).
Funding
This work was supported by the National Natural Science Foundation of China (funded 41977349, 91644103), the Postdoctoral Foundation of China Postdoctoral Science Foundation (2016 M601694), and Jiangsu Province (1601090B).
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Yang, C., Sun, X., Zhang, C. et al. Green synthesis of Co-Ni hollow spheres for its electrochemical detection of dopamine. J Nanopart Res 22, 55 (2020). https://doi.org/10.1007/s11051-020-4775-z
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DOI: https://doi.org/10.1007/s11051-020-4775-z