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Ru and / or Ir noble metal oxide and application thereof to oxygen evolution electro-catalysis

A precious metal oxide, precious metal salt technology, applied in metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical/physical process, etc., can solve application limitations, cumbersome steps, complicated operation process, etc. problems, to achieve high preparation efficiency, extended application scope, economical and reasonable effects

Active Publication Date: 2014-11-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This type of method is suitable for the synthesis of most shell component microcapsules, but because the main template insulating material silicon oxide in the shell is difficult to completely remove, the application of this type of material in electrocatalysis is limited, and the operation process is complicated. In order to form a dense shell layer, it often needs to go through multiple deposition operations, and the steps are relatively cumbersome.

Method used

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  • Ru and / or Ir noble metal oxide and application thereof to oxygen evolution electro-catalysis
  • Ru and / or Ir noble metal oxide and application thereof to oxygen evolution electro-catalysis
  • Ru and / or Ir noble metal oxide and application thereof to oxygen evolution electro-catalysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 4g of surfactant P123 and dissolve it in 93g of deionized water, add 25g of hydrochloric acid with a concentration of 37wt.%, stir at 40°C for 2h, add dropwise 8.8g of tetraethyl orthosilicate (TEOS), stir for 24h, and move to a high-temperature reaction kettle in 120°C for 24 hours, cooled naturally, filtered, the solid powder was washed with deionized water until no foam, and dried at 60°C for 24 hours to prepare silica molecular sieve SBA-15.

[0034] Disperse 2.5g of SBA-15 in 150mL of 1wt.% APS ethanol solution, stir at room temperature for 4h, filter, wash with absolute ethanol, repeat 5 times, and vacuum dry at 60°C to obtain amino-modified silica molecular sieve SBA -15. Take 0.45g of amino-modified SBA-15 and disperse it in 40mL of deionized water, add H 2 IrCl 6 , so that the total noble metal ion concentration is 0.08M, after stirring and impregnating for 4h, at 50°C, N 2 Add dropwise 1M NaBH under protection 4 solution to make NaBH 4 The molar rat...

Embodiment 2

[0036] Adopt the same method of embodiment 1 to test, and embodiment 1 difference is, but add the RuCl that contains 3~5 crystalline waters 3 with H 2 IrCl 6 Replace H 2 IrCl 6 , where the precursor molar ratio of Ru to Ir is 1:4, the preparation of Ru 0.2 Ir 0.8 o 2 , denoted as S-Ru 0.2 Ir 0.8 o 2 .

Embodiment 3

[0038] Adopt the same method of embodiment 1 to test, and embodiment 1 difference is, but add the RuCl that contains 3~5 crystalline waters 3 with H 2 IrCl 6 Replace H 2 IrCl 6 , where the precursor molar ratio of Ru to Ir is 4:1, the preparation of Ru 0.8 Ir 0.2 o 2 , denoted as S-Ru 0.8 Ir 0.2 o 2 .

[0039] from figure 1 It can be seen that the S-IrO prepared in Example 1 2 It has a nanorod-like structure, indicating that it replicates the shell layer mechanism of SBA-15. from figure 2 It can be seen that the catalysts prepared in Examples 1 to 3 have a typical rutile phase structure, calculated by the Sherrer formula, S-Ru x Ir 1-x o 2 The average grain size is 5-7nm.

[0040] from image 3 It can be seen from the linear scan curve of S-Ru x Ir 1-x o 2 The oxygen evolution electrocatalytic activity was enhanced with the increase of Ru content, especially near the onset oxygen evolution potential.

[0041] The catalyst prepared in Examples 1-3 was used...

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Abstract

The invention relates to a Ru and / or Ir noble metal oxide with a molecular formula expressed as Ru*Ir1-xO2, wherein x satisfies the relation of: 0<=x<=1. The noble metal oxide is prepared by using an amino modified silicon oxide molecular sieve SBA-15 as a template, and impregnating and reducing the Ru and / or Ir noble metal into surrounding holes of the template housing by Coulomb and capillary effect. The method is a simple preparation method of noble metal oxide with controllable morphology, and applies a hard template method to preparation of binary noble metal oxide to expand its scope of application. The Ru*Ir1-xO2 prepared by the invention shows good oxygen evolution electro-catalysis performance when used as a solid polymer electrolyte (SPE) water electrolyzer anode catalyst. The invention has extensive application value in regenerative fuel cell (RFC), photoelectric catalysis and electrolysis hydrogen generator device.

Description

technical field [0001] The invention relates to an oxygen evolution electrocatalyst Ru and / or Ir noble metal oxide, specifically a kind of noble metal oxide prepared by using amino-modified silicon oxide molecular sieve without surfactant as a template, which can be applied to SPE water electrolysis , RFC or oxygen evolution electrocatalyst in various electrolysis devices. Background technique [0002] In recent years, SPE water electrolysis technology has become a research hotspot in the field of hydrogen production due to its advantages of high efficiency, zero emissions, compact structure, environmental friendliness, and high product purity. Moreover, the high-purity oxygen produced by it has also been used in aerospace, medical treatment, and analysis. and other fields. However, the high price is the main reason that restricts the further commercial application of SPE water electrolysis technology. Therefore, how to reduce the cost and improve the electrolysis efficienc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/46C25B11/08
Inventor 俞红梅李光福宋微窦美玲邵志刚衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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