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. 2020 Jan 28;10:1365. doi: 10.1038/s41598-020-58403-x

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Current densities of five Au@Ni/C electrodes in 0.1 M NaOH containing 5 mM glucose at 0.10 V by amperometric measurements (The current densities were normalized to the first electrode) (A); current densities of 5 mM glucose in 0.1 M NaOH solution tested every half day by amperometric measurements (The current densities were normalized to the first day) (B), the current densities are the average values of triplicate determinations; CVs of the Au@Ni/C (C) and Au/C (D) electrode with the presence and absence of different concentration of Cl⁻ ions.