Abstract
A novel Ti-supported gold catalyst (nanoAu/Ti) with a nanoporous 3D texture has been fabricated using a hydrothermal method. Au particles were stably deposited on the Ti surface from the mixture of aqueous tetrachlororoauric acid and polyethylene glycol at 180 °C. Voltammetry (CV) and chronoamperometry were used to characterize the nanoAu/Ti electrode and assess its electroactivity towards glucose oxidation. Compared to polycrystalline Au, the nanoAu/Ti electrode shows similar CV profiles in alkaline solution. However, in an alkaline solution containing 10 mM glucose, the nanoAu/Ti electrode presents much higher anodic current densities and a more negative onset potential (ca. −0.75 V) for glucose oxidation than a bulk Au electrode. Analysis for Tafel plot of the nanoAu/Ti electrode shows that electro-oxidation of glucose takes place via a one-electron rate-determining step. Results indicate a high and (relatively) stable electrocatalytic activity of the nanoAu/Ti for glucose oxidation.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No.20876038) and A Project Supported by Scientific Research Fund of Hunan Provincial Education Department, China (No.07A019). Qingfeng Yi thanks the Project Sponsored by the Scientific Research Foundation for Returned Overseas Chinese Scholars, State Education Ministry, China ([2007]1108).
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Yi, Q., Yu, W. Electrocatalytic activity of a novel titanium-supported nanoporous gold catalyst for glucose oxidation. Microchim Acta 165, 381–386 (2009). https://doi.org/10.1007/s00604-009-0148-0
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DOI: https://doi.org/10.1007/s00604-009-0148-0