Iridium-tungsten alloy nano-material, preparation method thereof and application of iridium-tungsten alloy nano-material as acidic oxygen evolution reaction electrocatalyst

A nanomaterial, tungsten alloy technology, applied in nanotechnology, nanotechnology, metal processing equipment, etc., can solve problems such as poor activity, high price, and unfavorable large-scale development

Active Publication Date: 2021-05-07
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, IrO 2 There are still obvious disadvantages when the system is used in acidic OER: the stability is strong, but its activity is relatively poor; at the same time, iridium, as a noble metal, is expensive, which is not conducive to large-scale development

Method used

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  • Iridium-tungsten alloy nano-material, preparation method thereof and application of iridium-tungsten alloy nano-material as acidic oxygen evolution reaction electrocatalyst
  • Iridium-tungsten alloy nano-material, preparation method thereof and application of iridium-tungsten alloy nano-material as acidic oxygen evolution reaction electrocatalyst
  • Iridium-tungsten alloy nano-material, preparation method thereof and application of iridium-tungsten alloy nano-material as acidic oxygen evolution reaction electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of IrW alloy nanomaterials:

[0036] Weigh 4.123g of sodium tungstate dihydrate and 4.41g of oxalic acid, stir and dissolve in 100ml of water, add 1mol / L dilute sulfuric acid drop by drop and check with acidic precision pH test paper, adjust the pH to 3.2, and use it as the mother liquor for later use. Take 20ml of mother liquor in a beaker, weigh 1.586g of ammonium sulfate in the mother liquor, stir and dissolve, after the solution is clarified, weigh 0.25g of chloroiridic acid (35% effective content) in the beaker filled with the above solution, stir rapidly until thoroughly dissolved, the solution was brown and transparent. Transfer the brown solution into a 25ml polytetrafluoroethylene hydrothermal reaction kettle, take a 2cm×2cm hydrophilic carbon cloth (soaked with concentrated sulfuric acid and concentrated nitric acid for one week in advance) and place it in the reaction kettle, making it lean against the container The wall remains vertical. Put it...

Embodiment 2-4

[0051] Only the amount of Ir source added (as shown in Table 1) was changed, and the rest of the conditions were the same as in Example 1. The OER catalytic performance is shown in Table 1.

[0052] The comparison of different examples shows that when the content of Ir is 7wt%, the catalyst activity reaches the optimum, and the catalytic performance will not increase significantly if the content of Ir is continued to increase.

[0053] The input amount and electrochemical performance summary table of Ir among the table 1 embodiment 1~4

[0054]

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Abstract

The invention discloses an iridium-tungsten alloy nano-material, a preparation method thereof and application of the iridium-tungsten alloy nano-material as an acidic oxygen evolution reaction catalyst. An iridium-doped tungsten oxide nanowire intermediate is directly loaded on carbon cloth through a hydrothermal reaction, and the iridium-tungsten alloy nano-material is obtained through high-temperature reduction. The obtained nano material is loaded on carbon cloth and can be directly used as an electrode of an electrolytic tank, so that the problems of low diffusion rate, poor conductivity and the like caused by the use of a binder are avoided. Compared with a conventional IrO2 catalyst, the metal tungsten which is rich in content, low in price and resistant to acid corrosion is selected as a main body structure, the use amount of precious metal iridium is greatly reduced, and the cost is reduced. Compared with commercial IrO2, the alloy material has higher OER activity and stability, and has a relatively high industrial application prospect.

Description

technical field [0001] The invention relates to the technical fields of material chemistry and electrocatalysis, in particular to an iridium-tungsten alloy nanomaterial, its preparation method and its application as an electrocatalyst for acidic oxygen evolution reaction. Background technique [0002] Electrocatalysis is a promising energy conversion technology that can convert difficult-to-storage electrical energy into other forms of energy, such as electrocatalytic water splitting to generate clean hydrogen energy, electrocatalytic carbon dioxide reduction (CO 2 RR) to generate carbon energy, etc. Among these reactions, the oxygen evolution reaction (OER) plays an important role. Taking the water splitting reaction as an example, the reaction can be divided into two half-reactions, the cathodic hydrogen evolution reaction (HER) and the anodic oxygen evolution reaction (OER). potential, thus greatly limiting the efficiency of water splitting. In addition, the existing e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/052C25B11/054C25B11/065C25B11/089C25B1/04B22F9/22B22F1/00B82Y30/00B82Y40/00
CPCC25B1/04B22F9/22B82Y30/00B82Y40/00B22F1/07B22F1/054Y02E60/36
Inventor 王功名路正裴志彬牛淑文刘馨苗牛迪孙达
Owner UNIV OF SCI & TECH OF CHINA
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