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Nanoporous-structure oxygen evolution catalyst with iridium oxide enriched on surface and preparation method for oxygen evolution catalyst

A nanoporous, surface oxidation technology, applied in the field of electrochemistry, can solve the problems of low conductivity and high IrO2 usage, and achieve the effects of low cost, controllable preparation process conditions and broad application prospects

Inactive Publication Date: 2018-01-26
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of these metal oxides are electrochemically inert and have low conductivity, which eventually lead to IrO 2 usage remains high

Method used

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  • Nanoporous-structure oxygen evolution catalyst with iridium oxide enriched on surface and preparation method for oxygen evolution catalyst

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preparation example Construction

[0037] A specific scheme of a preparation method of a nanoporous structure oxygen evolution catalyst enriched in iridium oxide on the surface comprises the following steps:

[0038] Step 1: adding chloroiridic acid hydrate and cobalt chloride hydrate precursors to the NaOH solution to obtain the first solution; the ratio of substances n(Ir):n(Co)=1~3:1~2, n(NaOH)=20n(Ir+Co);

[0039] Step 2: The first solution described in step 1 is reacted in a water bath at 80°C until the solvent is evaporated to dryness to obtain the first product;

[0040] Step 3: burning the first product described in step 2 in an oxygen atmosphere for 1 hour at a burning temperature of 450° C., and cooling to room temperature to obtain a second product;

[0041] Step 4: The second product described in step 3 was dissolved in 5M HNO 3 stirring for 24 hours for acid etching, finally washing, suction filtration, and drying to obtain a nanoporous oxygen evolution catalyst with surface iridium oxide enriche...

Embodiment 1

[0043] 1) put H 2 IrCl 6 ·6H 2 O and CoCl 2 ·6H 2 The O precursor is added to the NaOH solution, the substance ratio n(Ir):n(Co)=1:1, n(NaOH)=20n(Ir+Co), and the first solution is obtained.

[0044]2) The first solution described in 1) was reacted in a water bath at 80°C until the solvent was evaporated to dryness to obtain the first product.

[0045] 3) The first product described in 2) was burned in an oxygen atmosphere for 1 hour at a temperature of 450° C., and cooled to room temperature to obtain a second product.

[0046] 4) 3) the second product in 5M HNO 3 stirring for 24 hours for acid etching, finally washing, suction filtration, and drying to obtain a nanoporous oxygen evolution catalyst with surface iridium oxide enriched.

[0047] 5) ultrasonically disperse the obtained surface iridium oxide-enriched nanoporous structure oxygen evolution catalyst in ethanol to obtain a suspension; apply the obtained suspension to a copper grid and dry it, then scan it with a...

Embodiment 2

[0050] 1) put H 2 IrCl 6 ·6H 2 O and CoCl 2 ·6H 2 The O precursor is added to the NaOH solution, the substance ratio n(Ir):n(Co)=1:2, n(NaOH)=20n(Ir+Co), and the first solution is obtained.

[0051] 2) The first solution described in 1) was reacted in a water bath at 80°C until the solvent was evaporated to dryness to obtain the first product.

[0052] 3) The first product described in 2) was burned in an oxygen atmosphere for 1 hour at a temperature of 450° C., and cooled to room temperature to obtain a second product.

[0053] 4) 3) the second product in 5M HNO 3 stirring for 24 hours for acid etching, finally washing, suction filtration, and drying to obtain the nanoporous structure oxygen evolution catalyst enriched in iridium oxide on the surface.

[0054] 5) ultrasonically disperse the obtained surface iridium oxide-enriched nanoporous structure oxygen evolution catalyst in ethanol to obtain a suspension; apply the obtained suspension to a copper grid and dry it, t...

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Abstract

The invention relates to a nanoporous-structure oxygen evolution catalyst with iridium oxide enriched on the surface and a preparation method for the oxygen evolution catalyst, and relates to the electrochemical field. The nanoporous-structure oxygen evolution catalyst with iridium oxide enriched on the surface can be obtained by adding a Co precursor into an Ir precursor and performing hydrolysisreaction, pyrolysis treatment and an acid etching process. The preparation method for the nanoporous-structure oxygen evolution catalyst with iridium oxide enriched on the surface comprises the following steps: adding the Co precursor into the Ir precursor, and performing hydrolysis reaction, pyrolysis treatment and the acid etching process, thereby preparing the catalyst, wherein conditions in apreparation process are controllable. The oxygen evolution catalyst which has the nanoporous structure, a high specific surface area and an IrO2 surface enrichment structure, has excellent oxygen evolution reaction catalysis activity and excellent stability. Besides, cheap Co is added so that the cost of the catalyst can be effectively reduced, and therefore, the oxygen evolution catalyst has a wide application prospect.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a surface iridium oxide (IrO 2 ) enriched nanoporous structure oxygen evolution catalyst and preparation method thereof. Background technique [0002] Hydrogen production by water electrolysis is a relatively mature technology for producing high-purity hydrogen. However, the currently commonly used alkaline water electrolysis technology has disadvantages such as low current density, power density, energy efficiency, and gas purity. In contrast, solid polymer electrolyte water electrolysis (SPEWE) has higher safety reliability, current density, energy efficiency and specific capacity, and the purity of hydrogen produced by SPE water electrolysis cells can be as high as 99.99%. These advantages make SPEWE a research hotspot in hydrogen production technology in recent years. [0003] However, the slower kinetics of the oxygen evolution reaction on the anode side and the higher ove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/06
CPCY02E60/36
Inventor 邢巍李国强常进法刘长鹏葛君杰李晨阳梁亮
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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