Preparation method of copper oxide-doped nickel-iron-like hydrotalcite nanosheet/graphene bifunctional catalyst for water splitting
A technology of graphene and copper oxide, applied in the field of electrocatalysis
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Embodiment 1
[0026]Take a certain amount of graphene oxide GO and ultrasonically disperse it in 100mL aqueous solution containing 50% formamide to make the concentration 0.3mg / mL. The metal ion concentration of copper is 10mmol / L, 20mmol / L and 0.75mmol / L respectively, makes the copper metal ion concentration be 2.5% of the nickel-iron metal ion concentration, stirs 1h and makes metal salt dissolve completely, under the condition of violent stirring, Slowly titrate with 0.7mol / L aqueous sodium hydroxide solution containing 50% formamide until the pH of the reaction solution is 8.5-9.5, add 100 μL of 80% hydrazine hydrate to the mixture, and gradually heat to 100°C for 2 hours After cooling, the reaction solution was centrifuged and separated, and the precipitate was washed three times with deionized water and ethanol, and dried to obtain copper oxide-doped ultrathin nickel-iron-like hydrotalcite nanosheet / graphene composite, which was recorded as 2.5% CuO- NiFe-LDHNS / rGO;
Embodiment 2
[0028] Take a certain amount of graphene oxide GO and ultrasonically disperse it in 100mL aqueous solution containing 60% formamide to make the concentration 0.3mg / mL, add ferric nitrate nonahydrate, nickel nitrate hexahydrate and copper nitrate hexahydrate in turn The metal ion concentration of copper is 10mmol / L, 20mmol / L and 0.75mmol / L respectively, makes the copper metal ion concentration be 2.5% of the nickel-iron metal ion concentration, stirs 1h and makes metal salt dissolve completely, under the condition of violent stirring, Slowly titrate with 0.7 mol / L sodium hydroxide aqueous solution containing 60% formamide until the pH of the reaction solution is 8.5 to 9.5. After the reaction solution is centrifuged, the precipitate is washed three times with deionized water and ethanol, and dried. The copper oxide-doped ultra-thin nickel-iron-like hydrotalcite nanosheet / graphene composite was obtained, denoted as CuNiFe-LDHNS / GO;
Embodiment 3
[0030] Take a certain amount of graphene oxide GO and ultrasonically disperse it in 100mL aqueous solution containing 50% formamide to make the concentration 0.3mg / mL. The metal ion concentration of copper is 10mmol / L, 20mmol / L and 0.3mmol / L respectively, make the copper metal ion concentration be 1% of the nickel-iron metal ion concentration, stir for 1h to make the metal salt dissolve completely, under the condition of vigorous stirring, Slowly titrate with 0.7mol / L aqueous sodium hydroxide solution containing 50% formamide until the pH of the reaction solution is 8.5-9.5, add 100 μL of 80% hydrazine hydrate to the mixture, and gradually heat to 100°C for 2 hours After cooling, the reaction solution was centrifuged and separated, and the precipitate was washed three times with deionized water and ethanol, and dried to obtain copper oxide-doped ultrathin nickel-iron-like hydrotalcite nanosheet / graphene composite, which was recorded as 1% CuO- NiFe-LDHNS / rGO;
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