Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of oxygen reduction composite catalyst and its preparation method and application

A composite catalyst and reaction technology, which is applied in the direction of fuel cell half-cells and primary battery half-cells, structural parts, electrical components, etc., can solve the problem that the catalytic performance of silver-based catalysts for oxygen reduction reactions cannot meet actual requirements and the toxicity of reagents Large size, complex operation, etc., to achieve good catalytic activity and stability, simple operation, and environmental friendliness

Active Publication Date: 2019-10-18
江苏顺隆鸿泰电力设备有限公司
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these studies, all involve the step of reducing silver nitrate (or other silver salts) to silver simple substance and attaching it to the carbon carrier, but the method is complicated to operate and the reagent is highly toxic, especially the prepared silver-based catalyst. Oxygen reduction reaction catalytic performance can not meet the actual requirements

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of oxygen reduction composite catalyst and its preparation method and application
  • A kind of oxygen reduction composite catalyst and its preparation method and application
  • A kind of oxygen reduction composite catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] The invention provides a method for preparing an oxygen reduction composite catalyst, comprising the following steps:

[0029] (1) mixing carbon carrier, urea, glucose, soluble iron source, silver nitrate and water to obtain a reaction dispersion;

[0030] (2) performing a hydrothermal reaction on the reaction dispersion liquid obtained in the step (1) to obtain a hydrothermal material;

[0031] (3) performing solid-liquid separation on the hydrothermal material obtained in the step (2) to obtain a solid product;

[0032] (4) Calcining the solid product obtained in the step (3) in a protective atmosphere to obtain an oxygen reduction composite catalyst.

[0033] The invention mixes carbon carrier, urea, glucose, soluble iron source, silver nitrate and water to obtain reaction dispersion liquid. In the present invention, there is no special limitation on the type of the carbon support, and the carbon support known to those skilled in the art can be used as an oxygen re...

Embodiment 1

[0050] (1) Mix 1.141g urea, 0.991g glucose, 1.135g ferric chloride, 0.171g silver nitrate and 75mL grade I molecular water, stir magnetically at 400rpm / min for 40min, then add 0.21g activated carbon, continue at 400rpm / min Magnetically stirred for 40min to obtain a reaction dispersion;

[0051] (2) The reaction dispersion obtained in the step (1) is placed in a hydrothermal reaction kettle with a polytetrafluoroethylene liner and a stainless steel shell, and at 110° C., the hydrothermal reaction is carried out in a blast drying oven for 9 hours, and the Cool to room temperature to obtain hydrothermal material;

[0052] (3) Use a filter membrane with a diameter of 0.10 μm to filter the hydrothermal material obtained in the step (2), rinse the solid on the filter membrane twice with grade I molecular water, and dry the obtained solid in blast Dry overnight at 40°C in an oven, and grind the dried solid for 5 minutes with an agate mortar to obtain a solid product;

[0053] (4) I...

Embodiment 2

[0055] (1) Mix 1.261g of urea, 0.631g of glucose, 0.912g of ferrous sulfate, 0.171g of silver nitrate and 65mL of grade I molecular water, stir magnetically at 600rpm / min for 20min, then add 0.19g of graphene, at 600rpm / min Continue magnetic stirring for 20 minutes to obtain a reaction dispersion;

[0056] (2) The reaction dispersion obtained in the step (1) is placed in a hydrothermal reaction kettle with a stainless steel shell of a polytetrafluoroethylene liner, and at 130° C., a hydrothermal reaction is carried out in a blast drying oven for 7 hours. Cool to room temperature to obtain hydrothermal material;

[0057] (3) Use a filter membrane with a diameter of 0.10 μm to filter the hydrothermal material obtained in the step (2), use grade I molecular water to wash the solid on the filter membrane 4 times, and dry the obtained solid in blast Dry overnight at 60°C in an oven, and grind the dried solid for 15 minutes with an agate mortar to obtain a solid product;

[0058] ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
current densityaaaaaaaaaa
Login to View More

Abstract

The invention provides a preparation method of an oxygen reduction composite catalyst. A carbon carrier, urea, glucose, a soluble iron source, silver nitrate and water are mixed; the obtained reaction dispersion liquid is subjected to a hydrothermal reaction; the obtained hydrothermal material is subjected to solid liquid separation; and the obtained solid product is calcined in protection atmosphere to obtain the oxygen reduction composite catalyst. According to the preparation method, urea is used as an alkali source and glucose is used as a reducing agent; and silver nitrate is reduced to elementary silver by adopting the hydrothermal method, and the soluble iron source is deposited into ferric hydroxide to be calcined under the protection atmosphere to finally prepare the oxygen reduction composite catalyst loaded with silver particles and iron-containing granules. The preparation method provided by the invention is simple in operation and environment friendly; the oxygen reduction composite catalyst prepared by the method has relatively high catalytic activity and stability; and when the catalyst is applied to a metal-air battery to be used as an air electrode catalyst, the oxygen reduction reaction catalytic performance is higher than JM 20%Pt / C.

Description

technical field [0001] The invention relates to the field of catalytic materials, in particular to an oxygen reduction composite catalyst and its preparation method and application. Background technique [0002] Metal-air batteries, especially aluminum-air batteries, will be the most promising technology for energy conversion and storage. Aluminum-air batteries have many advantages, such as low price, environmental friendliness, low operating temperature (normal temperature), and the actual energy density is as high as 600wh kg -1 . However, the reaction speed of the air electrode of the aluminum-air battery is very slow at room temperature, and a catalyst is needed to catalyze the speed-up. At present, the best catalyst is commercial platinum carbon, the common one is JM 20% Pt / C, but platinum is a rare metal, the price is very expensive, and it is difficult to apply it commercially on a large scale. [0003] In recent years, because the price of silver metal is much low...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M12/06
Inventor 李福枝刘跃军石璞
Owner 江苏顺隆鸿泰电力设备有限公司