Hydrogen hexachloroplatinate (IV) (H2PtCl6, ≥99.9%) and gold(III) tetrachloride trihydrate (HAuCl4·3H2O, ≥49.0%) were provided by Sigma. Commercial Pt/C (20 wt. %) was provided by Johnson Matthey. L-Ascorbic acid (AA, ≥99.7%) and methanol (≥99.7%) were purchased from Sinopharm Chemical Reagent Co. Ltd. All reagents and chemicals were used as received. Ultrapure water (18.2 MΩ cm) from a Milli-pore system was used in all experiments.
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