Preparation method of Ru monatomic doped Ni (OH) 2 coupled FeOOH and application of Ru monatomic doped Ni (OH) 2 coupled FeOOH in water electrolysis under industrial current density

The invention discloses a preparation method for constructing a composite nano electrocatalyst by coupling Ru monatomic doped Ni (OH) 2 with FeOOH. The preparation method comprises the following steps: step 1, pretreating foamed nickel; 2, 1.2 mmol of NiCl. 6H2O, 5 mmol of CO (NH2) 2, 0.2 mmol of RuCl3. XH2O and 1 mmol of NaCl are dissolved in 40 mL of deionized water, and the mixture is stirred to be uniform; 3, transferring the mixed solution in the step 2 and the pretreated foamed nickel into a 100mL polytetrafluoroethylene reaction kettle, and reacting at 120 DEG C for 12 hours; step 4, washing the foamed nickel after the reaction with deionized water and ethanol for several times, and then performing vacuum drying to obtain the RuSAs/Ni (OH) 2 precursor; and 5, immersing the obtained RuSAs/Ni (OH) 2 precursor in a 4.5 mg/mL FeSO4. 7H2O solution at normal temperature to react for 1 hour, then washing foamed nickel after the reaction for multiple times by using deionized water and ethanol respectively, and