Method for preparing SPE (solid polymer electrolyte) anodic oxygen evolution catalysts for water electrolysis

An electrocatalyst, water electrolysis technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of harsh roasting conditions and limited applications, and achieve the effects of simple and convenient operation, control of process parameters, and good application prospects.

Active Publication Date: 2012-05-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +2
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Problems solved by technology

The preparation of powder oxygen evolution catalyst mainly includes Adams roasting method and sol-gel method. Adams roasting method is a relatively simple method for preparing metal oxides. It was proposed by Adams and Shriner in 1923. However, its harsh calcination conditions and large metal oxide particles limit its wider application.

Method used

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  • Method for preparing SPE (solid polymer electrolyte) anodic oxygen evolution catalysts for water electrolysis
  • Method for preparing SPE (solid polymer electrolyte) anodic oxygen evolution catalysts for water electrolysis
  • Method for preparing SPE (solid polymer electrolyte) anodic oxygen evolution catalysts for water electrolysis

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Weigh 1g RuCl 3 ·nH 2O (n=3~5) was dissolved in 50mL ethanol / water (equal volume ratio, the same below) solution, stirred for 30min, and 0.38M NaHCO was added dropwise 3 ethanol / water solution to make the pH = 8, continue to stir for 30 minutes, let it stand for 5 hours, pour off the upper layer solution, centrifugal filter, wash with deionized water, repeat 3 times, AgNO 3 No white emulsion or precipitate was formed when the solution was tested. Vacuum-dried at 80°C overnight, baked in air at 400°C and 500°C for 30 minutes, and cooled naturally to prepare the anode oxygen evolution catalyst RuO for SPE water electrolysis. 2 , yield about 0.3g.

Embodiment 2

[0032] Weigh 1g of H 2 IrCl 6 (Ir content 37wt%) solution 50mL ethanol / water solution, other steps are with embodiment 1, make SPE water electrolysis anode oxygen evolution catalyst IrO 2 , yield about 0.3g.

Embodiment 3

[0034] Weigh 5mg each of the anode catalysts of Example 1 and Example 2, dissolve them in 1mL of absolute ethanol, disperse ultrasonically for 15min, add 50μL of 5wt% Nafion solution dropwise, continue ultrasonically dispersing for 30min, take 25μL and apply Glassy carbon working electrode, with a saturated calomel electrode as a reference electrode and a platinum sheet electrode as a counter electrode to form a classic three-electrode system, at 0.5M H 2 SO 4 In the solution, under the condition of nitrogen flow, the oxygen evolution catalyst prepared in Example 1 and Example 2 was subjected to cyclic voltammetry test and linear scan ( figure 1 and figure 2 ).

[0035] Test results: The Ru(III) / Ru(IV), Ru(IV) / Ru(VI) and Ir(III) / Ir(IV) pairs corresponding to the characteristic redox peaks are very obvious, and the RuO 2 , IrO 2 It has a large electric double layer charging current, and it shows that it has good oxygen evolution activity. Onset oxygen evolution potential...

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Abstract

The invention relates to a method for preparing SPE (solid polymer electrolyte) anodic oxygen evolution catalysts for water electrolysis. The method mainly includes steps of dissolving precursors of metal salt, such as RuCl3, H2PtCl6, H2IrCl6 and the like, into ethanol / water solution, regulating the pH (potential of hydrogen) value of the solution by NaHCO3 ethanol / water, then ageing, separating, washing, roasting and the like, so that noble metal oxides with high oxygen evolution activity are prepared. Accordingly, the noble metal load amount is reduced, and cost of the SPE water electrolysis technology is lowered, and foundation for further commercialized application of the SPE water electrolysis technology is laid.

Description

technical field [0001] The invention relates to solid polymer electrolyte (SPE) water electrolysis, in particular to a preparation process of an anode oxygen evolution catalyst for SPE water electrolysis. Background technique [0002] Today, when energy and the environment attract much attention, low-carbon economy has become the darling of the times. Governments and business circles of various countries are working on how to develop new energy and how to use energy efficiently to meet the requirements of sustainable development of human beings. Hydrogen energy is known as the most potential energy carrier, which has the advantages of cleanness, high efficiency, and wide sources. As a traditional hydrogen production technology, electrolyzed water currently only accounts for about 4% of the total hydrogen production, and needs to be improved in terms of energy consumption, cost, stability, and safety. The SPE water electrolysis technology has become a research hotspot in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25B1/04
CPCY02E60/366Y02E60/36
Inventor 衣宝廉肖钢李光福于广欣俞红梅
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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