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Crosslinked porous La1-xCaxCoO3 oxygen evolution reaction catalyst preparation method

A catalyst and oxygen precipitation technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve problems such as low specific surface area, increased cost, and many additives , to achieve the effect of increasing the specific surface area, low cost, and improving the apparent activity

Inactive Publication Date: 2017-09-15
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the larger the specific surface area of ​​the catalyst, the stronger the catalytic activity. However, when the existing perovskite oxide catalysts are only prepared by ball milling, sol-gel or combustion synthesis, the specific surface area is low and the particle size is large. The surface catalytic reaction is restricted; some perovskite oxide catalysts also need to use a substrate, and there are many additives, which increases the cost

Method used

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  • Crosslinked porous La1-xCaxCoO3 oxygen evolution reaction catalyst preparation method
  • Crosslinked porous La1-xCaxCoO3 oxygen evolution reaction catalyst preparation method
  • Crosslinked porous La1-xCaxCoO3 oxygen evolution reaction catalyst preparation method

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preparation example Construction

[0029] A kind of cross-linked porous La of the present invention 1-x Ca x CoO 3 The preparation method of oxygen evolution reaction catalyst, the chemical formula of described catalyst is La 0.6 Ca 0.4 CoO 3 or La 0.5 Ca 0.5 CoO 3 , its preparation method comprises the following steps:

[0030] 1) Liquid preparation: Weigh soluble La(NO 3 ) 3 .6H 2 O or LaCl 3 , Ca(NO 3 ) 2 .4H 2 O or CaCl 2 and Co(NO 3 ) 2 .6H 2 O or CoCl 2 .6H 2 O dissolves in volume V 1 In distilled water, stir continuously with a magnetic stirrer to make metal precursor solution A, wherein the sum of the amount of soluble La salt and soluble Ca salt is equal to the amount of soluble Co salt, and the metal precursor solution The total concentration of metal ions in A is 0.5-1.0mol / L; weigh citric acid, pore-forming agent sucrose or glucose to a volume of V 2 in distilled water to make solution B; where V 1 :V 2 =3:2, the amount of substance of citric acid is equal to the sum of the a...

Embodiment 1

[0036] 1) Cross-linked porous perovskite La 0.6 Ca 0.4 CoO 3 Preparation of Catalyst for Oxygen Evolution Reaction

[0037] Accurately weigh 0.6mmol La(NO 3 ) 3 .6H 2 O, 0.4mmol Ca(NO 3 ) 2 .4H 2 O, 1mmol Co(NO 3 ) 2 .6H 2 O was dissolved in 30ml of distilled water and stirred on a magnetic stirrer for 15min; in addition, 2mmol of citric acid and 3mmol of sucrose were weighed and dissolved in 20ml of distilled water and stirred evenly to form solution B; Solution B was added dropwise to the metal cation nitrate mixed solution to form a sol solution; the sol solution was placed in a magnetic stirrer and stirred in a constant temperature water bath at a temperature of 80°C, and most of the water was evaporated to form a wet gel; then in an oven at 100°C Dry the dry gel; place the dry gel in a muffle furnace, and calcinate it in an air atmosphere at 650°C for 2 hours to obtain a cross-linked porous La 0.6 Ca 0.4 CoO 3 catalyst powder.

[0038] 2) Testing the cross-...

Embodiment 2

[0049] With reference to the preparation method and test method of the catalyst of Example 1, the difference is that the calcination temperature is 675 ° C, and the cross-linked porous La 0.6 Ca 0.4 CoO 3 catalyst powder.

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Abstract

The invention discloses a crosslinked porous La1-xCaxCoO3 oxygen evolution reaction catalyst preparation method. The general formula of a catalyst is La1-xCaxCoO3, wherein x is 0.4 or 0.5. The preparation method includes the steps: weighing soluble La salt, Ca salt and Co salt, dissolving the salt in distilled water with the volume of V1, and continuously stirring the distilled water to prepare metallic precursor solution A; weighing citric acid and pore-forming agents and adding the citric acid and the pore-forming agents into distilled water with the volume of V2 to prepare solution B; gradually adding the solution B into the metallic precursor solution A under stirring conditions to form mixed solution; performing constant temperature evaporation on the mixed solution, removing water and drying the mixed solution in a drying oven to obtain dried gel; placing the dried gel into a muffle furnace, calcining the dried gel in air atmosphere and taking out the dried gel to obtain the crosslinked porous La1-xCaxCoO3 catalyst. V1:V2=3:2, the pore-forming agents are added as compared with a traditional sol-gel method, the prepared catalyst forms a meshed porous structure, the specific surface area of the catalyst is increased, the pore-forming agents are carbonized and burned off at high temperature in the calcining process, and technology is simple.

Description

technical field [0001] The invention belongs to the field of alkaline water electrolysis catalyst research, specifically a cross-linked porous La 1-x Ca x CoO 3 The preparation method of the oxygen evolution reaction catalyst. Background technique [0002] When water is electrolyzed, hydrogen can be generated at the cathode, and oxygen can be precipitated at the anode, which is a key technology for the storage and conversion of renewable energy. Non-noble metal oxides can be used as catalysts for the anode oxygen evolution reaction during alkaline water electrolysis, and the common perovskite oxide ABO 3 There are several key properties: the flexible change between transition metal oxidation states to form redox couples B m+ / B m +1 ; Oxygen vacancy or oxygen excess forms a defect structure; excellent oxygen anion mobility and oxygen exchange kinetics are beneficial to catalyze oxygen reduction / oxygen evolution reactions. ABOs 3 Changes in the type and proportion of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J23/002B01J23/83B01J37/088B01J2523/00B01J35/613B01J35/651B01J35/647B01J2523/23B01J2523/3706B01J2523/845Y02E60/36
Inventor 胡玮许帅童金林
Owner HUBEI UNIV