Preparation method of catalyst, and application of catalyst in metal-air battery
A catalyst, solvothermal reaction technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problem of poor crystal formation, reduced electrocatalytic performance, low specific surface area And other issues
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[0036] The invention provides a method for preparing a perovskite type composite oxygen reduction catalyst, comprising the following steps:
[0037] A) After mixing the cerium source compound, the acid-base buffer, the surfactant and the solvent, performing a solvothermal reaction under airtight conditions to obtain a reaction solution;
[0038] B) adding a lanthanum source compound, a manganese source compound and a compound containing M to the reaction solution to obtain a mixed solution, and after adjusting the pH value of the mixed solution, perform a hydrothermal reaction to obtain a catalyst precursor;
[0039] C) Calcining the catalyst precursor to obtain a perovskite composite oxygen reduction catalyst, the chemical formula of the perovskite composite oxygen reduction catalyst is La 1-x m x MnO 3 -CeO 2 , M is selected from Sr and / or Ca, 0≤x<1.0.
[0040] In the invention, firstly, the cerium source compound, the acid-base buffer, the surfactant and the solvent are...
Embodiment 1
[0080] First, according to CeO 2 The amount of cerium nitrate dissolved in ethylene glycol, control CeO 2 Solid content is 10%; Add appropriate tetrabutylammonium bromide surfactant in above-mentioned solution again, control surfactant concentration is 0.1mmol / L; And add a certain amount of urea, control urea / CeO 2 The molar ratio is 0.4, fully stirred and mixed evenly to prepare a mixed solution. The above mixed solution was transferred to a polytetrafluoroethylene-lined stainless steel reactor, and subjected to solvothermal reaction at a certain temperature of 180° C. for 6 hours; the above reactor was lowered to room temperature to obtain the intermediate product of the first step.
[0081] At room temperature, add according to La to the above-mentioned first step reactor 0.7 Sr 0.3 MnO 3 Aqueous solutions of lanthanum nitrate, strontium nitrate, manganese nitrate in stoichiometric ratio, control CeO 2 / La 0.7 Sr 0.3 MnO 3The ratio is 2 / 3; and a mixed solvent of eth...
Embodiment 2
[0085] First, according to CeO 2 The amount of cerium nitrate dissolved in ethylene glycol, control CeO 2 Solid content is 3%; Add appropriate tetrabutylammonium bromide surfactant in above-mentioned solution again, control surfactant concentration is 0.01mmol / L; And add a certain amount of urea, control urea / CeO 2 The molar ratio is 0.2, fully stirred and mixed evenly to prepare a mixed solution. The above mixed solution was transferred to a polytetrafluoroethylene-lined stainless steel reaction kettle, and solvothermal reaction was carried out at a certain temperature of 85°C for 2 hours; the above reaction kettle was lowered to room temperature to obtain the intermediate product of the first step.
[0086] At room temperature, add LaMnO 3 Aqueous solutions of lanthanum nitrate and manganese nitrate in stoichiometric ratio to control CeO 2 / LaMnO 3 Proportioning is 0.1; And form the mixed solvent of ethylene glycol and deionized water, control ethylene glycol / water ratio...
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