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Ag/MnyOx/C catalyst and preparation and application thereof

A technology of catalysts and mixtures, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, catalyst supports, etc., can solve the problem of unsatisfactory catalytic activity, stability and discharge limit current density at the same time Problems, to achieve the effect of environmental protection, speed up the process of industrialization, good stability

Active Publication Date: 2012-05-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Comparing the above catalysts comprehensively, its catalytic activity, stability, and discharge limiting current density are still not satisfactory at the same time, and further improvements are still needed on the basis of existing technologies

Method used

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  • Ag/MnyOx/C catalyst and preparation and application thereof
  • Ag/MnyOx/C catalyst and preparation and application thereof
  • Ag/MnyOx/C catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] First, 1g KMnO 4 Add to 20mL boiling water, gradually add 1.075g AgNO under stirring condition 3 Crystal, KMnO 4 and AgNO 3 The molar ratio is 1:1. Naturally cooled to room temperature, and then cooled to 2°C with an ice-water bath to obtain needle-shaped purple crystals and a purple solution. Filter and wash the solid matter with 200 mL of 2 °C ice water to remove residual K + and NO 3 - ; Naturally air-dried to obtain purple crystal AgMnO 4 .

[0046] The prepared 46.6mg AgMnO 4 Dissolve in 50mL of deionized water, add 60mg of Vulcan XC-72R carbon black, disperse evenly by ultrasonication for 30min, impregnate and stir for 4h at room temperature, then place in a water bath at 50°C and evaporate to dryness to obtain black powder AgMnO 4 / C. The resulting black powder AgMnO 4 / C ground, weighed and placed in a quartz boat, then transferred to a tube furnace and 2 Under atmosphere at 5°C min -1 The temperature was programmed to rise to 200°C, and treated at ...

Embodiment 2

[0048] First, 1g KMnO 4 Add to 20mL boiling water, gradually add 1.075g AgNO under stirring condition 3 Crystal, KMnO 4 and AgNO 3 The molar ratio is 1:1. Naturally cooled to room temperature, and then cooled in an ice-water bath to obtain needle-shaped purple crystals and a purple solution. Filter and wash with 200 mL of 2°C ice water to remove residual K + and NO 3 - ; Naturally air-dried to obtain purple crystal AgMnO 4 .

[0049] The prepared 46.6mg AgMnO 4 Dissolve in 50mL deionized water, then add 60mg Vulcan XC-72R carbon black, disperse evenly by ultrasonication for 30min, impregnate and stir at room temperature for 4h, then place in a water bath at 50°C and evaporate the water to dryness to obtain black powder AgMnO 4 / C. The resulting black powder AgMnO 4 / C ground, weighed and placed in a quartz boat, then transferred to a tube furnace and 2 Under atmosphere at 5°C min -1 The temperature was programmed to rise to 300°C, and treated at this temperature f...

Embodiment 3

[0051] First, 1g KMnO 4 Add to 20mL boiling water, gradually add 1.075g AgNO under stirring condition 3 Crystal, KMnO 4 and AgNO 3 The molar ratio is 1:1. Naturally cooled to room temperature, and then cooled in an ice-water bath to obtain needle-shaped purple crystals and a purple solution. Filter and wash with 200 mL of 2°C ice water to remove residual K + and NO 3 - ; Naturally air-dried to obtain purple crystal AgMnO 4 .

[0052] The prepared 46.6mg AgMnO 4 Dissolve in 50mL deionized water, then add 60mg Vulcan XC-72R carbon black, disperse evenly by ultrasonication for 30min, impregnate and stir at room temperature for 4h, then place in a water bath at 50°C and evaporate the water to dryness to obtain black powder AgMnO 4 / C. The resulting black powder AgMnO 4 / C ground, weighed and placed in a quartz boat, then transferred to a tube furnace and 2 Under atmosphere at 5°C min -1 The temperature was programmed to rise to 400°C, and treated at this temperature f...

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Abstract

Disclosed is an Ag / MnyOx / C catalyst. MnyOx is any one of Mn3O4 and MnO or is a compound of Mn3O4 and MnO or a compound of Mn3O4 and MnO2, wherein the mass percentage of MnO2 in the compound of Mn3O4 and MnO2 ranges from 0.01% to 99.9%. The Ag / MnyOx / C catalyst is prepared through high-temperature pyrolysis of AgMnO4 by two steps including (1) preparation of a precursor AgMnO4 crystal and (2) preparation of Ag / MnyOx / C catalyst. The catalyst has high ORR (oxygen reduction reaction) catalytic activity on alkaline condition, is high in stability, low in cost, safe, non-toxic and non-pollution, favorable for environmental protection and capable of being produced massively and the like, can be used as oxygen reduction catalyst for metal air fuel cells, alkaline anion-exchange membrane fuel cells and other alkaline conditions, while resources of raw materials of the catalyst are rich and low in cost.

Description

technical field [0001] The invention relates to an alkaline oxygen reduction catalyst, in particular to an oxygen reduction catalyst used in metal-air fuel cells, alkaline anion exchange membrane fuel cells and other alkaline conditions, as well as its preparation and application. Background technique [0002] With the increasing consumption of fuels such as coal, oil and natural gas and the depletion of energy resources, it is urgent to find energy technologies that are environmentally friendly and sustainable. Because of its high energy conversion efficiency, no pollution, no noise and other advantages, fuel cells have become a research hotspot all over the world. [0003] Fuel cell technologies include proton exchange membrane fuel cells, solid oxide fuel cells, metal air fuel cells, and alkaline anion exchange membrane fuel cells. As far as the current technology is concerned, proton exchange membrane fuel cells are expensive and limited by precious metal catalyst resou...

Claims

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Application Information

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IPC IPC(8): B01J23/68B01J32/00H01M10/42H01M4/88
CPCH01M4/90C25B11/0484H01M8/083H01M4/9016H01M4/9083Y02E60/50Y02E60/128H01M4/9041H01M12/06B01J23/688C25B11/093Y02P70/50
Inventor 孙公权唐琪雯姜鲁华王素力
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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