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Amorphous non-precious metal hydroxide modified perovskite composite catalyst used for oxygen evolution reaction and preparation method thereof

A composite catalyst, hydroxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the research without double perovskite material modification, etc. To achieve the effect of maintaining catalytic activity and morphology stability, good cycle stability and high electrochemical activity

Active Publication Date: 2015-11-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In recent years, many researchers have found that transition metal oxides and hydroxides exhibit good oxygen evolution reactivity in alkaline media, but there is no research on using them as catalyst outer layer modification materials to modify double perovskite materials. Research

Method used

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  • Amorphous non-precious metal hydroxide modified perovskite composite catalyst used for oxygen evolution reaction and preparation method thereof
  • Amorphous non-precious metal hydroxide modified perovskite composite catalyst used for oxygen evolution reaction and preparation method thereof
  • Amorphous non-precious metal hydroxide modified perovskite composite catalyst used for oxygen evolution reaction and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Amorphous Fe 0.75 Ni 0.25 (OH) 2 Preparation of modified PBC catalyst

[0036] Dissolve ferric nitrate and nickel nitrate with a molar ratio of 3:1 into distilled water, wherein 0.25 mmol of nickel nitrate is placed on a magnetic stirrer and stirred to facilitate the dissolution of the salt solution. After the nitrate is fully dissolved, stir to Add 904mg of PBC powder and 124mg of tert-butanol into the solution and continue to stir, the mass of the prepared modified catalyst is about 10wt% of the PBC powder. The excess mixed alkali (in this embodiment, the molar quantities of KOH, ammonia water and urea in the mixed alkali are respectively 1.5mmol, 2mmol and 2mmol) double the molar weight of nitrate ion (the total molar amount of alkali is 5.5mmol) is weighed Measure and dissolve in distilled water, fully dissolve and add to the beaker that is constantly stirring. The iron and nickel ions in the solution will form hydroxides that will precipitate from their salt sol...

Embodiment 2

[0038] Amorphous Ni(OH) 2 Preparation of modified PBC catalyst

[0039] Unlike Example 1, except that the modified material is selected, only nickel nitrate is used to impregnate the PBC powder in this example, and the rest of the synthesis process and testing methods are the same as in Example 1. image 3 The results of the phase structure containing the catalyst in the PBC are not significantly different from that of pure PBC, confirming that Ni(OH) 2 The modification layer is in an amorphous state. Figure 6 is Ni(OH) 2 Scanning electron microstructure image of the modified PBC catalyst, with amorphous Fe 0.75 Ni 0.25 (OH) 2 The modified PBC is similar, and the modified material has a flake-like loose structure; Figure 7 , 8 The electrochemical performance and stability of its oxygen evolution are given in 9 and 9. It can be seen that its catalytic activity is greatly improved compared with pure PBC and corresponding oxide-modified PBC, but its performance is slight...

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Abstract

The invention discloses an amorphous non-precious metal hydroxide modified perovskite composite catalyst used for oxygen evolution reaction and a preparation method thereof. The composite catalyst is composed of a main body material and a modification material, wherein the main body material is perovskite oxide and the modification material is amorphous non-precious metal hydroxide. The chemical composition of the amorphous non-precious metal hydroxide modification material is MxA1-x(OH)y, wherein M and A are selected from transition metal elements, x is no less than 0 and no more than 1, and y is no less than 2 and no more than 3. The main body material A-position ordered double perovskite oxide and has a molecular formula of Ln0.5Ba0.5CoO3-delta. The hydroxide modification material and the perovskite main body in the composite catalyst produce cooperative effect; the catalytic activity of the composite catalyst is greatly improved compared with catalytic activity of a main body catalyst; and after long-time electrochemical performance test, the composite catalyst can maintain catalytic activity and morphological stability.

Description

technical field [0001] The invention belongs to the field of regenerative fuel cells and metal-air batteries with high specific energy density, and specifically relates to an amorphous non-noble metal hydroxide-modified perovskite composite catalyst for oxygen evolution reaction and a preparation method thereof. Background technique [0002] Energy is the driving force for the development of the national economy and the basis for the country's sustainable development. However, with the vigorous development of industry and the continuous improvement of people's lives, human demand for energy is increasing day by day. However, the excessive development and use of fossil energy has caused energy depletion and serious environmental pollution. In order to realize the sustainable development of mankind, the development and utilization of economical and clean new energy is the theme of world energy technology in the 21st century. Currently, fuel cells and metal-air batteries are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83H01M4/86H01M4/88H01M4/90
CPCY02E60/50
Inventor 梁凤丽
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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