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Method for directly preparing nano-catalyst based on Pd for alcohol fuel battery

A nano-catalyst and fuel cell technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve battery performance degradation, low electrocatalytic activity, and methanol toxicity And other problems, to achieve the effect of high recovery, high activity, strong resistance to methanol

Inactive Publication Date: 2008-10-08
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after many years of research on DMFC, it was found that DMFC still has the following technical problems: (1) the electrocatalytic activity of the anode catalyst to fuel methanol is low, and it is easily poisoned by the intermediate product of methanol oxidation; (2) methanol is toxic, Flammable, etc.; (3) Methanol is easy to pass through the Nafion membrane, resulting in the waste of methanol and the "mixed potential" effect of the cathode, which greatly reduces the performance of the battery

Method used

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  • Method for directly preparing nano-catalyst based on Pd for alcohol fuel battery
  • Method for directly preparing nano-catalyst based on Pd for alcohol fuel battery
  • Method for directly preparing nano-catalyst based on Pd for alcohol fuel battery

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Embodiment 1

[0031] The preparation of embodiment 1, Pd / C (20wt.%) catalyst

[0032] Weigh 80mg of dry activated carbon carrier XC-72R and 100mg of sodium citrate, add it into 50ml of ethylene glycol, stir for 4 hours with magnetic force to disperse evenly; weigh 57.6mg of Pd(acac) 2 , and added to the homogeneously dispersed carbon-containing slurry; the obtained slurry was reduced in a constant temperature oil bath at 198°C for 6h, then cooled to room temperature, washed with ultrapure water, filtered and placed in an oven at 75°C for 10h in vacuum to obtain a Pd / C catalyst . Its XRD pattern is attached figure 1 , based on the (220) crystal plane, calculated according to the Scherrer equation, the particle size of the Pd / C catalyst is about 6.0nm. The performance of its electrocatalytic oxidation of formic acid is shown in the appendix Figure 4 , the maximum current density is about 24.3mAcm -2 , it can be seen that Pd / C has a high activity for the electrocatalytic oxidation of form...

Embodiment 2

[0033] Example 2, Pd 3 Preparation of Pt / C (20wt.%) Catalyst

[0034] Weigh 80mg of dry activated carbon carrier XC-72R, add it into 50ml of ethylene glycol, stir for 4 hours with magnetic force to disperse evenly; weigh 35.7mg of Pd(acac) 2 and 15.8 mg platinum acetylacetonate Pt(acac) 2 , and added to the homogeneously dispersed carbon-containing slurry; the obtained slurry was reduced in a constant temperature oil bath at 175°C for 6h, then cooled to room temperature, washed with ultrapure water, filtered and placed in an oven at 75°C for 10h in vacuum to obtain Pd 3 Pt / C catalyst. Due to Pd(acac) 2 Compared with Pt(acac) 2 The decomposition temperature is low, so during the oil bath reduction process, Pd(acac) 2 Decompose and reduce first, the obtained Pd 3 The surface of Pt / C catalyst nanoparticles is rich in Pt. Its XRD pattern is attached figure 1The middle curve a is based on the (220) crystal plane, calculated according to the Scherrer equation, Pd 3 The part...

Embodiment 3

[0035] Example 3, Pd 3 Preparation of Pt / C (20wt.%) Catalyst

[0036] Weigh 80mg of dry activated carbon carrier XC-72R and 150mg of sodium citrate, add it into 50ml of ethylene glycol, stir for 4 hours with magnetic force to disperse evenly; weigh 35.7mg of Pd(acac) 2 and 15.8 mg Pt(acac) 2 , and added to the homogeneously dispersed carbon-containing slurry; the obtained slurry was reduced in a constant temperature oil bath at 175°C for 6h, then cooled to room temperature, washed with ultrapure water, filtered and placed in an oven at 75°C for 10h in vacuum to obtain Pd 3 Pt / C catalyst. Its XRD pattern is attached figure 1 The middle curve b, based on the (220) crystal plane, calculated according to the Scherrer equation, Pd 3 The particle size of the Pt / C catalyst is about 4.5nm; its TEM is shown in the attached image 3 (b), the particle size obtained by TEM is about 4.8 ± 0.8nm, and the catalyst particle size obtained by XRD pattern and TEM is consistent. Due to Pd(a...

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Abstract

The invention discloses a method for preparing a Pd-based nano-catalyst used for alcohol fuel cells directly, which is characterized in that the following steps are included sequentially: A. carbon carrier or carbon carrier and stabilizing agent are added into polylol and are dispersed evenly to acquire serum containing carbon; B. precursor and the precursor with metallic additions are added into the serum containing carbon which is evenly dispersed; C. the serum acquired is carried out oil bath and reduction for 2-10 hours at the temperature of 125-198 DEG C; D. the serum is cooled to the room temperature and then filtrated, repeatedly washed with ultrapure water and placed in a backing oven for vacuum drying, thus acquiring the Pd-based catalyst. The method of the invention prepares the Pd-based nano-catalyst by reducing by glycol directly or by thermal treatment after reducing by the glycol, which is a preparation technology with simple preparation process, convenient operation, short procedure, high recovery rate and environment-friendly property.

Description

technical field [0001] The invention relates to the preparation technology of Pd-based nano catalysts for direct alcohol fuel cells. Background technique [0002] Direct methanol fuel cell (DMFC) has the advantages of abundant fuel sources, convenient storage and transportation, low pollution, high energy density, high energy conversion efficiency, and high price tolerance. It is suitable as a portable power source, so it can be commercialized first. However, after many years of research on DMFC, it was found that DMFC still has the following technical problems: (1) the electrocatalytic activity of the anode catalyst to fuel methanol is low, and it is easily poisoned by the intermediate product of methanol oxidation; (2) methanol is toxic, Flammable, etc.; (3) Methanol is easy to pass through the Nafion membrane, resulting in the waste of methanol and the "mixed potential" effect of the cathode, which greatly reduces the performance of the battery. Aiming at the permeation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J23/89H01M4/92
CPCY02E60/50
Inventor 杨辉王文明邹志清黄庆红夏保佳
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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