A kind of preparation method of PDPT fuel cell catalyst for direct formic acid fuel cell

A formic acid fuel cell and fuel cell technology, which is applied in battery electrodes, chemical instruments and methods, catalysts for physical/chemical processes, etc., can solve problems such as synthesis and production of catalysts that are difficult to apply, and achieve the effects of simple operation and expansion of synthesis scale.

Active Publication Date: 2015-08-05
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

Xia et al obtained different nanostructures by using Pd nanocube templates and halogen salts to control the crystal face selective epitaxial growth of Pt (see: H. Zhang, M. Jin, J. Wang, W. Li, P. H. C. Camargo, M. J. Kim, D.Yang, Z.Xie, Y.Xia, Journal of the American Chemical Society, 133(2011) 6078-6089.) However, this fine nano-architecture method is not easy to apply to large-scale catalyst synthesis and production

Method used

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  • A kind of preparation method of PDPT fuel cell catalyst for direct formic acid fuel cell
  • A kind of preparation method of PDPT fuel cell catalyst for direct formic acid fuel cell
  • A kind of preparation method of PDPT fuel cell catalyst for direct formic acid fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Firstly, Pd / C with a Pd content of 20wt% was prepared, and the US CABOT carrier Vulcan XC-72R was used. The parameters of the carrier are:

[0046] Table 1 Parameters of the carrier

[0047] model

VXC-72

physical form

powdery

specific surface area

254

DBP oil absorption value (cc / 100g)

192

Particle size (nm)

30

Tinting strength (ASTM)

87

Density (g / l)

96.1

[0048] First, 80 mg of the carrier was dispersed in 200 mL of deionized water by ultrasonication for 0.5 h. Then add the precursor PdCl 2 aq (4mg Pd / mL, HCl 5M), again by 0.5h ultrasonic dispersion. Use concentrated NaOH solution to adjust its pH to 10, add NaBH dropwise 4 Solution (NaBH 4 80mg / 50mL of deionized water) to reduce the precursor. After the reduction is completed, a replacement step is performed: adding H to the above-mentioned reduced Pd precursor 2 PtCl 6 Solution (18.105mg Pt / mL) and KCl 0.045g, stirred...

Embodiment 2

[0054] Example 2: The sample preparation method is basically the same as in Example 1, except that KCl is replaced by 0.060 g of KBr. Test method is identical with embodiment 1, 0.5M H 2 SO 4 The cyclic voltammetry curve in solution is as follows figure 2 , CO adsorption and desorption experiments such as Figure 6 , 0.5M H 2 SO 4 The cyclic voltammetry test and chronoamperometry test results carried out with 0.5M HCOOH solution are shown in Figure 7 and Figure 8 .

Embodiment 3

[0055] Example 3: The sample preparation method is basically the same as that of Example 1, except that no KCl is added. Test method is identical with embodiment 1, 0.5M H 2 SO 4 The cyclic voltammetry curve in solution is as follows figure 2 , CO adsorption and desorption experiments such as Figure 4 , 0.5M H 2 SO 4 The cyclic voltammetry test and chronoamperometry test results carried out with 0.5M HCOOH solution are shown in Figure 7 and Figure 8 .

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Abstract

The invention provides a preparation method of a Pd(alpha)Pt fuel cell catalyst for a direct formic acid fuel cell. The preparation method comprises the steps of: (a) dispersing a carrier in deionized water by means of alternative ultrasound and stirring to obtain a mixed solution; (b) adding a Pd precursor and an aqueous solution of a reducing agent into the mixed solution obtained in the step (a), and carrying out loading and reduction of a Pd nanometer particle by means of impregnation reduction to obtain a suspension of the Pd loaded carrier; (c) adding a haloid and a Pt precursor into the suspension obtained in the step (b), and heating the resulting product while stirring for replacement reaction; and (d) washing to remove Cl<-1> in the suspension obtained in the step (c) using deionized water, thereby obtaining the Pd(alpha)Pt fuel cell catalyst after filtering and drying. The preparation method provided by the invention does not use a surfactant and a template, surface controllability of a precious metal nanoparticle is realized, and the operation is simple.

Description

technical field [0001] The invention relates to the technical field of dye cells, in particular to a method for preparing a PdPt fuel cell catalyst used in direct formic acid fuel cells. Background technique [0002] Direct formic acid fuel cell is a fuel cell that uses liquid formic acid instead of hydrogen as the source of pollution. Due to the high oxidation current, excellent self-ionizable conductivity, and low membrane permeability, direct formic acid fuel cells have great potential as power sources for automobiles and portable electronic devices. Direct formic acid dye cells are mainly composed of anode and dye , and the cathode composition. At present, the most commonly used anode is a Pd-based electrode, but when formic acid is electrooxidized, the pure Pd electrode will slowly dissolve, and CO will be generated to poison Pd, reduce the durability of the catalyst, and cause a low utilization rate of Pd, which also causes Increased battery cost. [0003] At presen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44H01M4/92
CPCY02E60/50
Inventor 邢巍司凤占刘长鹏廖建辉梁亮李晨阳张玉微
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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