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Use of catalyst for high temperature proton exchange membrane fuel cell

A technology of proton exchange membrane and fuel cell, which is applied in the direction of catalyst carrier, catalyst activation/preparation, physical/chemical process catalyst, etc., and can solve the problem of not too high metal primary loading, uneven particle size distribution, large catalyst particle size, etc. problem, to achieve the effect of short cycle, uniform particle size and composition distribution, and uniform particle size distribution

Inactive Publication Date: 2007-03-28
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

For example, the catalyst prepared by the impregnation method has large particle size and uneven particle size distribution, and the metal loading capacity cannot be too high. If you want to prepare a high-load catalyst, you need to impregnate it multiple times; the liquid phase reduction method generally uses a reducing agent in the The active components of the catalyst are reduced at a certain temperature and then loaded on a carbon carrier. This method usually uses traditional convective heating, which has disadvantages such as uneven heating and slow reaction rate; the colloid method is mainly through the preparation of relatively stable metal oxide colloid, and then settle or transfer to the carrier, and then prepare the catalyst through other processes. This method has a long preparation cycle and the process is not easy to control

Method used

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  • Use of catalyst for high temperature proton exchange membrane fuel cell
  • Use of catalyst for high temperature proton exchange membrane fuel cell

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Add 0.5g XC-72 carbon powder into 50ml 95% vol. of ethylene glycol aqueous solution, and mix evenly by ultrasonic to obtain slurry A; add 8.07ml chloroplatinic acid hexahydrate ethylene glycol solution with a concentration of 74mgPt / ml, 3. Mix 49ml of zirconyl nitrate dihydrate aqueous solution with a concentration of 20mgZr / ml, and mix them uniformly by ultrasonic to obtain mixed solution B; mix the above slurry A with solution B, and add 2.5M NaOH ethylene glycol solution under stirring conditions until PH=12 , put the above mixture in a microwave oven (frequency 2450 MHz, output power 700 W) and heat for 5 min, cool to room temperature, add 3M hydrochloric acid aqueous solution to pH = 4.5, and stir for 3 h in an oil bath at 60 °C. Wash with water and filter to neutral and Cl-free - , after drying, pass through 10% H 2 / N 2 Mixed air flow, heat treatment at 550°C for 4 hours, N 2 Purged to room temperature, the total metal content obtained was 57.2%, and the molar...

Embodiment 2

[0037] Add 0.5g XC-72 carbon powder into 50ml 95% vol. of ethylene glycol aqueous solution, and mix evenly by ultrasonic to obtain slurry A; add 4.2ml chloroplatinic acid hexahydrate ethylene glycol solution with a concentration of 74mgPt / ml, 1. Mix 12ml of cerium nitrate hexahydrate aqueous solution with a concentration of 20mgCe / ml, and mix them uniformly by ultrasonic to obtain mixed solution B; mix the above slurry A with solution B, and add 1M NaOH ethylene glycol solution under stirring condition to PH=12, The above mixture was heated in a microwave oven (frequency 2450 MHz, output power 700 W) for 10 min, cooled to room temperature, added 3M hydrochloric acid aqueous solution until pH = 6, and stirred at room temperature for 3 h. Wash with water and ethanol and filter to neutral and Cl-free - , after drying, pass through 20% H 2 / N 2 Mixed air flow, heat treatment at 500°C for 3 hours, N 2 Sweep to room temperature, obtain total metal content and be 40%, the catalyst...

Embodiment 3

[0039] Add 0.5g of carbon microspheres into 100ml of ethanol, and mix them uniformly by ultrasonic to obtain slurry A; add 1.55ml of chloroplatinic acid hexahydrate ethylene glycol solution with a concentration of 74mgPt / ml, and 0.5ml of vanadic acid with a concentration of 20mgV / ml Sodium dodecahydrate aqueous solution was mixed, and ultrasonically mixed evenly to obtain mixed solution B; the above slurry A was mixed with solution B, and 2.5M NaOH aqueous solution was added under stirring conditions to pH = 13, and the above mixed solution was placed in a microwave oven (frequency (2450MHz, output power: 700W) heated for 15min, cooled to room temperature, added 3M hydrochloric acid aqueous solution to pH = 0.5, and settled at room temperature for 3h. Wash with water and filter to neutral and Cl-free - , after drying, pass through 10% H 2 / Ar 2 Mixed air flow, heat treatment at 900°C for 2 hours, Ar 2 Purging to room temperature, the total metal content obtained is 20%, and...

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Abstract

Specifically, the invention is related to application of catalyst in high activity and high stability on cathode and anode. Active components of catalyst is composed of Pt and one or more than one metalline elementary substance or metallic oxide selected from IIIB, IVB, VB, VIB, VIIB, VIIIB, IB, IIB, IIIA and IVA families. Atomic ratio between Pt and other metal active ingredients in catalyst is 20:1-1:20. percentage of content of active ingredients in catalyst is 10-80%; percentage of metal content is 5-80%; C carrier is in residual. Using adjustment and control of microwave, the invention makes active ingredients be deoxidized or be pyrolyzed quickly. Active ingredients are adsorbed on surface of electroconductive carrier at same time through controlling pH value. Advantages are: small and even distributed granules of catalyst, high oxygen reduction activity, hydroxy activity, and heat stability. The method is simple, fast, of low energy consumption and no pollution.

Description

technical field [0001] The invention relates to a high-temperature proton exchange membrane fuel cell cathode and anode catalyst, in particular to the application of a high-activity and high-stability catalyst in a high-temperature proton exchange membrane fuel cell cathode and / or anode. Background technique [0002] A fuel cell (FC) is an energy conversion device that converts chemical energy stored in fuel and oxidant directly into electrical energy isothermally according to electrochemical principles. Because it does not go through the heat engine process, it is not limited by the Carnot cycle, has high energy conversion efficiency, is environmentally friendly, and hardly emits harmful substances such as nitrogen oxides and sulfur oxides. Therefore, it plays a very important role in improving the utilization rate of energy and the improvement of the existing human living environment. In addition to the general characteristics of fuel cells such as high energy conversion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/92B01J23/42B01J32/00B01J37/00
CPCY02E60/50
Inventor 张华民刘刚梁永民钟和香翟云峰衣宝廉刘德荣
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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