Abstract
AbstractIn this work, we study the fabrication, structural characterization, and electrochemical activity of titanium‐supported binary AuRu catalysts for glucose oxidation. The catalysts including Au99Ru1, Au95Ru5, Au93Ru7 and Au88Ru12 were prepared by a hydrothermal method using formaldehyde as a reduction agent. The morphologies of the prepared AuRu catalyst structures are characterized by porous dendritic particles with roughened surfaces with nano‐sized flakes. Electrochemical catalytic activity of the binary AuRu catalysts towards glucose oxidation in alkaline solutions was investigated using cyclic voltammetry and chronoamperometry. All binary AuRu catalysts facilitate glucose oxidation at the lower potentials and deliver higher anodic oxidation currents compared to pure Au catalyst. Among them, the binary Au95Ru5 catalyst presents the most negative onset potential of −0.872 V (vs. Ag/AgCl, 3 M KCl) for glucose oxidation in 0.1 M NaOH solution. For the Au95Ru5 catalyst, chronoamperometric data at the potential step of −0.65 V (vs. Ag/AgCl,3 M KCl) exhibit a well linear dependence of the anodic oxidation current density on glucose concentration in the range of 0 to 15 mM glucose.
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