Abstract
Glucose oxidation on platinum nanoparticles (Pt NPs) at varying potentials (from − 0.7 V to 0.2 V) was investigated using single entity electrochemistry. The active chemisorption model was found to be valid only at potentials below − 0.6 V, while the incipient hydrous oxide/adatom mediator (IHOAM) model was confirmed for potentials above − 0.6 V. In both cases, hydrous ions significantly improved glucose oxidation by freeing up active sites on the Pt NPs. The potential for glucose sensing at − 0.4 V, where continuous glucose oxidation took place, was assessed. Although the linearity was limited (0.1–0.6 mM), the high sensitivity of 423.056 µA mM− 1 cm− 2 and limit of detection (LOD) of 25.63 µM demonstrated promising prospects for glucose sensing at − 0.4 V, particularly for samples with low glucose concentrations.
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Acknowledgements
The authors acknowledge funding from Zhejiang Provincial Natural Science Foundation of China (Grant No. LY21F050004).
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JL and SL wrote the main manuscript text. JW and WZ conducted all the experiments. DZ, QX and YZ conducted the data analyzing and prepared all the figures. All authors reviewed the manuscript.
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Lin, J., Wang, J., Li, S. et al. The effect of hydroxide ions on the electrocatalysis of glucose at single platinum nanoparticles. J Appl Electrochem 53, 1991–1999 (2023). https://doi.org/10.1007/s10800-023-01905-z
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DOI: https://doi.org/10.1007/s10800-023-01905-z