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Fuel cell anode catalyst using heteropolyacid as promoter and preparation method thereof

A fuel cell, heteropolyacid technology, applied in battery electrodes, chemical instruments and methods, catalysts for physical/chemical processes, etc., can solve the problems of affecting catalyst performance, insufficient activity, catalyst poisoning, etc. High activity, good anti-toxicity effect

Inactive Publication Date: 2005-06-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the existing research on the promotion of W and Mo, the chlorides of W and Mo are mostly used as additives, but because the chlorides of W and Mo are dangerous chemicals, and the residual chloride ions will also affect the performance of the catalyst, so its use is restricted
[0009] All in all, the current problems of anode catalysts are mainly the following two problems: the first is that the activity is not high enough under low temperature conditions; the second is that the catalyst is easily oxidized by CO or methanol existing in the reformed gas. poison

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 10 grams of Xc-72 carbon black, add it to 300ml of nitric acid-sulfuric acid mixture with a concentration of 1mol / l and 0.5mol / l, react at 70°C for 2 hours, wash, filter, and dry to prepare the pre-treated Treated carbon support;

[0043] Suspend 2g of the above-mentioned Xc-72 carbon black treated in 150ml of double distilled water, stir for 2 hours to make the carrier highly dispersed in water; mix 1.0g of chloroplatinic acid (or 0.6g of platinum subchloride) Ruthenium chloride was dissolved in 50ml of secondary deionized water to obtain a solution of chloroplatinic acid and ruthenium trichloride; this solution was added dropwise to the above-mentioned carbon dispersion under stirring; after the dropwise addition, 0.1mol / l KOH solution to adjust the pH value of the solution to 7.0, heat to 60-80°C, add 1ml of 10% cetyltrimethylammonium bromide solution, stir well, then add 20ml of 37% formaldehyde dropwise solution, after the dropwise addition is completed, re...

Embodiment 2

[0046] Weigh 10 grams of Xc-72 carbon black, add it to 300ml of nitric acid-sulfuric acid mixture with a concentration of 1mol / l and 0.5mol / l, react at 70°C for 2 hours, wash, filter, and dry to prepare the pre-treated Treated Xc-72 carbon black;

[0047]Add 10 grams of the above pretreated carbon carrier into 100 ml of a concentration of 1.0% (weight ratio) silicon molybdenum acid solution, dry it at 100 to 110° C., then heat treat it at 200 to 300° C. and N in an atmosphere for 30 minutes to prepare Obtain Xc-72 carbon black powder containing about 10% heteropolyacid;

[0048] Suspend 2 g of Xc-72 carbon black containing silicomomolybdic acid prepared above in 150 ml of double distilled water, stir for 1 hour to make the carrier highly dispersed in water; dissolve 1.0 g of chloroplatinic acid and 1.0 g of ruthenium trichloride In 50ml of secondary deionized water, a solution of chloroplatinic acid and ruthenium trichloride was prepared; this solution was added dropwise to t...

Embodiment 3

[0051] Except that the solution added dropwise does not contain ruthenium trichloride, but contains silicomomolybdic acid; except that potassium sodium tartrate is used instead of ammonium chloride, others are the same as in Example 2. Experiment finds that do not contain ruthenium and contain molybdosilicate acid as the activity of the catalyzer that makes of promotor better than the Pt-Ru-Mo-Si / C catalyst that embodiment 2 makes, it can be seen that under the situation of adding molybdosilicon acid, Ru's The promotion effect is not reflected.

[0052] The particle size of the active component Pt measured by XRD broadening method is 3.9nm, the content of molybdenum in the catalyst is 5.7% and the content of Pt is 20.01% as measured by EDX. The experimental results show that the addition of silicomomolybdic acid can effectively improve the activity of the catalyst . The performance data of the catalysts measured by voltammetry are shown in Table 1.

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Abstract

This invention relates to a preparing method of positive pole catalyst of fuel battery using heteropolyacid as improver, including: (1) add the carbon carrier into the mixture solution of nitric acid and vitriol to react to get pre-process carbon carrier; (2) impregnate the carbon carrier in the heteropolyacid solution, heat process and obtain the electric conducting carbon carrier containing heteropolyacid; (3) suspend the conducting carbon carrier of (2) in the secondary distilled water, stir and make the carrier disperse and get carbon dispersing liquid; (4) fully dissolve chloroplatinic acid or platinous chloride and ruthenium trichloride in deionized water, and drop it to the dispersing solution of (3); (5) dry to get the catalyst containing heteropolyacid.

Description

technical field [0001] The invention belongs to the field of fuel cell catalysts, and relates to a fuel cell anode catalyst using heteropolyacid as a promoter and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cells (PEMFC) and direct alcohol fuel cells (DAFC) are considered to be the most promising two types of fuel cells for automobiles and other mobile applications, and catalyst materials are key materials for these two types of fuel cells, especially is the anode catalyst. [0003] At present, the widely used anode catalyst is platinum carbon catalyst (Pt / C), which has high catalytic activity, but the ability to resist CO poisoning is very poor. When it is used as the fuel of PEMFC, CO is an inevitable poison; and for DAFC directly using methanol as fuel, the reaction process will also produce CO intermediates that have a fatal poisoning effect on the Pt / C catalyst. In recent years, a Pt-Ru / C two-compon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/46H01M4/88H01M4/90H01M4/92
CPCY02E60/50
Inventor 廖世军蔡育芬袁高清
Owner SOUTH CHINA UNIV OF TECH
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