Ultrapure water (18.2 MΩ·cm), chloroplatinic acid hexahydrate (H2PtCl6·6H2O, AR), ammonium chloride (NH4Cl, AR), ammonium fluoride (NH4F, AR), potassium hydroxide (KOH, AR), hydrochloric acid (HCl, AR), sodium chloride (NaCl, AR), potassium carbonate (K2CO3, AR), sodium bicarbonate (NaHCO3, AR), and nickel chloride (NiCl2·6H2O, AR) were used as received. All reagents are from Beijing Shiji Company (Beijing, China).
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