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Method for prepn. of electrode catalyst with function of anti-CD and contg. platinum and ruthenium series carried on carbon nanometer tube

A technology of electrode catalysts and carbon nanotubes, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of battery performance degradation, poisoning, etc., and achieve small size, good dispersion, and dispersion good performance effect

Inactive Publication Date: 2004-10-20
BEIJING JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no matter the proton exchange membrane fuel cell or the direct methanol fuel cell, there is the problem of CO poisoning to the Pt catalyst, because the reformed gas contains a small amount of CO, and there will be an intermediate gas similar to CO in the methanol oxidation process, and trace amounts of CO CO can greatly reduce the performance of the battery, therefore, solving the problem of anti-CO has become an urgent problem to be solved by the fuel cell research community all over the world.

Method used

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  • Method for prepn. of electrode catalyst with function of anti-CD and contg. platinum and ruthenium series carried on carbon nanometer tube
  • Method for prepn. of electrode catalyst with function of anti-CD and contg. platinum and ruthenium series carried on carbon nanometer tube
  • Method for prepn. of electrode catalyst with function of anti-CD and contg. platinum and ruthenium series carried on carbon nanometer tube

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1. Activation treatment of nanotubes (provided by the Department of Chemical Engineering, Tsinghua University)

[0041] ·Water washing: put carbon nanotubes into a round bottom flask, wet it with absolute ethanol, add a certain amount of twice distilled water, heat to boil, reflux for 1 hour, filter, and dry at 80°C for 2 hours to obtain water-washed activated carbon nanotube samples .

[0042] Pickling: soak the water-washed activated carbon nanotube sample with 10% hydrochloric acid for 10 hours, reflux for 1 hour, filter, and wash with water until there is no Cl - Dry in vacuum at 80°C for 2 hours.

[0043] 2. Preparation of Pt-Ru / CNTs catalyst by in situ chemical reduction homogeneous deposition method

[0044] Raw material ratio: Pt:Ru=1:0.5

[0045] (1) Preparation of complex ions (ie complex ions)

[0046] ① Take chloroplatinic acid aqueous solution and add NaHSO 3 powder, stirred for 20 minutes, added Na 2 CO 3 The solution is adjusted to pH=5;

[0047] ...

Embodiment 2

[0055] 1. Activation treatment of carbon nanotubes (provided by the Department of Chemical Engineering, Tsinghua University), as above.

[0056] 2. Preparation of Pt-Sn / CNTs catalyst by in situ chemical reduction homogeneous deposition method

[0057] Raw material ratio Pt:Sn=1:1

[0058] (1) Preparation of complex ions (ie complex ions)

[0059] ① Take chloroplatinic acid aqueous solution and add NaHSO 3 powder, stirred for 20 minutes, added Na 2 CO 3 The solution is adjusted to pH=5;

[0060] ② Take another SnCl 2 Add a small amount of concentrated HCl to the solution, add NaHSO 3 powder, stirred for 20 minutes, added Na 2 CO 3 The solution was adjusted to pH=5.

[0061] (2) Preparation of metastable colloids

[0062] Mix the above ① and ② complex ion solutions together, and slowly add H 2 o 2 , adjusted to pH=5 with 5% NaOH solution.

[0063] (3) Homogeneous in-situ chemical reduction deposition

[0064] Add activated carbon nanotubes to the metastable colloid...

Embodiment 3

[0068] 1. Activation treatment of carbon nanotubes (provided by the Department of Chemical Engineering, Tsinghua University), as above.

[0069] 2. Preparation of Pt-Ru-H by in-situ chemical reduction homogeneous deposition method x WO y / CNTs catalyst

[0070] Raw material ratio Pt: Ru: H x WO y =1:1:1

[0071] (1) Preparation of complex ions (ie complex ions)

[0072] ① Take chloroplatinic acid aqueous solution and add NaHSO 3 powder, stirred for 20 minutes, added Na 2 CO 3 The solution was adjusted to pH=5; another RuCl 3 Add a small amount of concentrated HCl to the solution, add NaHSO 3 powder, stirred for 20 minutes, added Na 2 CO 3 The solution was adjusted to pH=5.

[0073] ② Take another Na 2 WO 4 Add a small amount of concentrated HCl to the solution, add NaHSO 3 powder, stirred for 20 minutes, added Na 2 CO 2 The solution was adjusted to pH=5.

[0074] (2) Preparation of metastable colloids

[0075] Mix the above ①②③ ion solutions together, slowly...

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Abstract

The preparation method of Pt-Ru series CO resistant electrode catalyst is characterized by that it uses carbon nano tube as carrier, utilizes the in-situ chemical reduction homogeneous precipitation method and makes the ions of Pt, Ru and Sn into compounding ion respectively (called complex ion for short), then it uses two kinds of three kinds of complex ions and mixes them together to obtain metastable colloid, them adopts cheap reduction agent formaldehyde (or sodium borohydride or ethyl alcohol or hydrogen gas) to make the metastable colloid be reduced and deposited on the activated carbon nano tube so as to obtain the invented electrode catalyst for proton-exchange membrane fuel cell. It possesses good electric catalytic activity and resistance to Co, and features large specific area, high porosity, good dispersion property and low ptatinum use level.

Description

1. Technical field [0001] The invention relates to a method for preparing an anti-CO electrode catalyst for a proton exchange membrane fuel cell, belonging to the technical field of catalyst manufacture. 2. Technical background [0002] As a green energy in the 21st century, fuel cells have attracted great attention from all over the world. Among them, the research on proton membrane fuel cell (PEMFC) and direct methanol fuel cell (DMFC) is more noticeable. One of their advantages is their widespread use as power sources for mobile vehicles. However, no matter the proton exchange membrane fuel cell or the direct methanol fuel cell, there is the problem of CO poisoning to the Pt catalyst, because the reformed gas contains a small amount of CO, and there will be an intermediate gas similar to CO in the methanol oxidation process, and trace amounts of CO CO can greatly reduce the performance of the battery. Therefore, solving the problem of anti-CO has become an urgent proble...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/40B01J37/02H01M4/88H01M4/92
CPCY02E60/50
Inventor 朱红孙正贵许韵华杨玉国申闫春
Owner BEIJING JIAOTONG UNIV
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