The effect of hydroxide ions on the electrocatalysis of glucose at single platinum nanoparticles

• Published in: Journal of applied electrochemistry Vol. 53; no. 10; pp. 1991 - 1999
• Main Authors: Lin, Jun, Wang, Jun, Li, Shuang, Zhao, Wenbin, Zhang, Dong, Zang, Yue, Xin, Qing
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.10.2023; Springer Nature B.V
• Subjects: Chemisorption; Chemistry; Chemistry and Materials Science; Electrochemistry; Glucose; Industrial Chemistry/Chemical Engineering; Nanoparticles; Oxidation; Physical Chemistry; Platinum; Research Article; Glucose oxidation; Pt NPs; Single entity electrochemistry
• ISSN: 0021-891X; 1572-8838
• DOI: 10.1007/s10800-023-01905-z

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. Graphical abstract