Preparation method for direct methanoic acid fuel cell palladium-on-carbon nano-catalyst

A formic acid fuel cell and nano-catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, battery electrodes, etc., can solve problems such as not suitable for mass production, high cost, complicated preparation process, etc., and achieve great application potential, The effect of small particle size and uniform particle distribution

Inactive Publication Date: 2008-12-10
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that this method usually requires some surfactants and separation and purification process, which is not suitable for mass production
The colloidal method can generally obtain noble metal nanoparticles with uniform particle size, but the preparation process is often complicated and the cost is high

Method used

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  • Preparation method for direct methanoic acid fuel cell palladium-on-carbon nano-catalyst
  • Preparation method for direct methanoic acid fuel cell palladium-on-carbon nano-catalyst
  • Preparation method for direct methanoic acid fuel cell palladium-on-carbon nano-catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Disperse 47.3 mg of activated carbon in 100 ml of a mixed solution of water and isopropanol with a volume ratio of 1:1, disperse and ultrasonically vibrate for 2 hours to obtain a suspension of activated carbon, add 25 ml of PdCl dissolved in hydrochloric acid 2 aqueous solution, hydrochloric acid and PdCl in the precursor aqueous solution 2 The molar concentrations are 7.2mM and 6mM respectively; then add 25ml 2mM sodium tungstate aqueous solution and stir for two hours; then add 50ml NaBH 4 aqueous solution for reduction, where NaBH 4 The number of moles is 8 times the number of moles of palladium, stirred for 8 hours, the resulting mixture was filtered and washed with water, and vacuum-dried at 80° C. for 10 hours to obtain a direct formic acid fuel cell anode carbon-supported palladium catalyst.

[0014] From figure 1 It can be seen in the photoelectron spectrum of , in the range of 30 to 45eV, there is no W 4f The characteristic peaks indicate that the W species...

Embodiment 2

[0016] Other conditions are the same as in Example 1, except that the molar concentration of the sodium tungstate aqueous solution is changed to 1 mM. The catalyst was not used (WO 3 ) n ·xH 2 Comparison of the electrochemical performance of formic acid oxidation with catalysts prepared by the common impregnation method of O colloidal sources. the result shows: image 3 The former peak current for the catalytic oxidation of formic acid shown in b, is image 3 The latter shown in e is 1.80 times the peak current for the catalytic oxidation of formic acid; Figure 4 The stability of the former to the catalytic oxidation of formic acid shown by c is better than Figure 4 The stability of the latter towards the catalytic oxidation of formic acid shown in d.

Embodiment 3

[0018] Other conditions are the same as in Example 1, only the molar concentration of the sodium tungstate aqueous solution is changed to 4mM. The catalyst was not used (WO 3 ) n ·xH 2 Comparison of the electrochemical performance of formic acid oxidation with catalysts prepared by the common impregnation method of O colloidal sources. the result shows: image 3 The former peak current for the catalytic oxidation of formic acid shown in c, is image 3 The latter shown in e is 1.75 times the peak current for the catalytic oxidation of formic acid; Figure 4 The stability of the former to the catalytic oxidation of formic acid shown by b is better than that of Figure 4 The stability of the latter towards the catalytic oxidation of formic acid shown in d.

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Abstract

The invention belongs to a preparation method for a direct formic acid fuel cell carbon-supported palladium nanometer catalyst, which takes (WO3) n and xH2O or (MoO3) n and xH2O as colloid source to form metal colloid with PdCl2 and uses NaBH4 for reducing, thus obtaining the carbon-supported palladium catalyst. The palladium particles of the catalyst have uniform distribution and small average grain size. The catalyst prepared by the method has higher performance on the catalytic oxidation of formic acid than the carbon-supported palladium catalyst prepared by the traditional impregnation method which has the same loading capacity but no colloid source. The method with simple practice does not need protective agent and the colloid source can be removed through simple washing; therefore, the method is suitable for batch preparation of the carbon-supported palladium catalyst.

Description

technical field [0001] The invention belongs to a method for preparing a carbon-supported palladium nano-catalyst for a direct formic acid fuel cell. Background technique [0002] Compared with direct methanol fuel cells, direct formic acid fuel cells have many advantages. Formic acid is non-toxic, it is a non-polluting, environmentally friendly substance, formic acid is non-flammable, and it is safe and convenient to store and transport. Formic acid is a strong electrolyte, so it can promote the transmission of electrons and protons, especially beneficial to increase the proton conductivity of the solution in the anode chamber, and the permeability of formic acid to Nafion membrane is only 1 / 5 of that of methanol. Although the energy density of formic acid is lower, less than 1 / 3 of that of methanol, the optimum working concentration of formic acid is 10mol / L, while the optimum working concentration of methanol is only 2mol / L. Therefore, the energy density of the direct f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J21/18H01M4/92
CPCY02E60/50
Inventor 邢巍黄云杰周小春廖建辉刘长鹏
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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