Abstract
A new type of Ni2+-loaded MWCNT composite was prepared by mixing carboxylated multiwalled carbon nanotubes (MWCNTs) and Ni2+ ions and allowing them to interact electrostatically. The resulting composite was subsequently used as an electrocatalyst for glucose (Glu) oxidation. Compared with electrodes modified through the addition of free Ni2+ ions or MWCNTs, the Ni2+/MWCNT composite electrode showed greatly improved properties such as hydrophilicity. Investigations of the Ni2+/MWCNT composite electrode via inductively coupled plasma atomic emission spectroscopy and nitrogen adsorption–desorption isotherms verified that Ni2+ ions had been adsorbed onto the surfaces of the MWCNTs in the composite. As expected, a Ni2+/MWCNT composite-based sensor showed extraordinary electrocatalytic performance in Glu oxidation. In the concentration range 0–4.3 mM, a good linear relationship between the Glu added and the current generated was observed, with a correlation coefficient (R 2) of 0.9988. The detection limit and sensitivity were calculated to be 0.081 μM and 2285 μA mM−1 cm−2, respectively. Finally, the new method was successfully applied to determine the Glu in a human blood sample. Recoveries of >100%, indicative of high reliability, accuracy, and precision, were obtained.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21305090), the State Key Laboratory of Analytical Chemistry for Life Science (SKLACLS1502), the Shanghai Natural Science Foundation (13ZR1428300), the Innovation Program of Shanghai Municipal Education Commission (14YZ086), and the Fundamental Research Funds for the Central Universities (to Shuang Zhou). The authors greatly appreciate the support provided by each of these institutions.
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Ouyang, R., Zong, T., Su, Y. et al. Excellent electrocatalytic performance of a Ni2+-loaded multiwalled carbon nanotube composite in glucose oxidation. J Solid State Electrochem 21, 2887–2898 (2017). https://doi.org/10.1007/s10008-017-3603-6
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DOI: https://doi.org/10.1007/s10008-017-3603-6