Abstract
The dynamic gas bubble template method was used to potentiostatically electrodeposit three-dimensional honeycomb-like porous nano‑gold (AuH) at −3 V vs SCE on a gold disk electrode in an aqueous bath containing 50 mM HAuCl4 and 3 M NH4Cl (AuH/Au). Then, Pt was potentiostatically deposited at −1 V vs SCE on the AuH/Au electrode in 0.1 M aqueous KCl containing 4 mM H2PtCl6 to yield a Pt/AuH/Au electrode. Scanning electron microscopy, X-ray diffraction pattern and cyclic voltammetry were employed to characterize the relevant electrodes. The Pt/AuH/Au electrode of large specific surface area exhibits high electrocatalytic activity for ethanol oxidation in 0.5 M aqueous H2SO4 or 1 M aqueous KOH. The Pt/AuH/Au electrode in 0.5 M aqueous H2SO4 shows a linear amperometric response to ethanol concentration from 0.05 mM to 43.3 mM with a sensitivity of 75.7 μA cm−2 mM−1, a limit of detection (LOD, S/N = 3) of 2.3 μM, and good selectivity, which is used to analyze ethanol in white-spirit/red-wine real samples with satisfactory results.
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