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3 protocols using hydrogen peroxide aqueous solution

1

Anodic Electrodeposition of IrO2 Catalyst

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IrO2 was anodically electrodeposited on a titanium screen mesh according to a previous report30 with minor modification. To prepare the electrodeposition solution, 0.15 g of IrCl4·H2O (Sigma-Aldrich) was dissolved in 100 mL of deionized water. Then, 0.5 g of oxalic acid (Sigma-Aldrich) and 1 mL of hydrogen peroxide aqueous solution (30 wt.%, Sigma-Aldrich) were added. After 10 min of stirring, the pH was slowly raised to 10.5 by stepwise addition of K2CO3 (Sigma-Aldrich). After preparation, the solution was heated to 90 °C for 15 min and subsequently cooled down to room temperature. Electrodeposition of IrO2 was carried out by applying a constant current (0.16 mA cm−2) on a titanium mesh (Fuel Cell Store) in a two-electrode cell for 15 min, with a graphite rod (Sigma-Aldrich) as the counter electrode.
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2

Synthesis and Functionalization of Graphene-Based Nanomaterials

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Graphite powder (particle size 20 μm), tetraethyl orthosilicate (TEOS), (3-aminopropyl) triethoxysilane (APTES), n-hydroxysuccinimide (NHS), 1-ethyl-3-(3-dimethyl aminopropyl) carbodiimide (EDC·HCl), and 1,8-dihydroxyanthraquinone (DHAQ) were purchased from Sigma-Aldrich, Ltd. Co. All other chemicals such as sodium nitrate (NaNO3), potassium permanganate (KMnO4), sulfuric acid (H2SO4), hydrochloric acid (HCl), hydrogen peroxide aqueous solution (H2O2), iron chloride hexahydrate (FeCl3, 6H2O), and iron chloride tetrahydrate (FeCl2, 4H2O) were of reagent grade and used without further purification.
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3

Synthesis and Characterization of Silicone Oil

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Glutaraldehyde (25% solution), Hydrogen peroxide aqueous solution (30% w/w), guaiacol (98%) were of analytical grade and obtained from Sigma-Aldrich (Germany). Phenol 99% and sodium phosphate used for the preparation of buffer solution were purchased from Merck (Germany). The analytical reagents like 4-aminoantipyrine (4-AAP) and potassium ferricyanide were obtained from Sigma Aldrich (Germany).
Silicone oil (polydimethylsiloxane), Rhodorsil® 47V20 was purchased from the Rhodia Company, France. Table 1 summarises its main chemical and physical properties [40] .
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