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Preparation method and application of PdRh catalyst for fuel cell

A fuel cell and catalyst technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of anti-poisoning ability and stability to be further improved, and achieve excellent catalytic oxidation performance of methanol, good catalytic stability, and mild reaction conditions. Effect

Active Publication Date: 2018-09-28
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even so, the catalytic activity, anti-poisoning ability and stability of pure Pd catalysts still need to be further improved.

Method used

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  • Preparation method and application of PdRh catalyst for fuel cell
  • Preparation method and application of PdRh catalyst for fuel cell
  • Preparation method and application of PdRh catalyst for fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Take 1.0 g of P123 and dissolve it in 10 mL of double distilled water with stirring and ultrasonic; take 10.21 mg of potassium chloropalladate and stir and ultrasonically dissolve it in 10 mL of double distilled water; then take 5.51 mg of rhodium chloride and dissolve it in 10 mL of double distilled water Finally, mix the above three solutions evenly.

[0036] (2) Transfer the mixed solution to the liner of a 50 mL polytetrafluoroethylene reactor, put it into the reactor, place it in a drying oven, and react at 180°C for 10 hours to stop the reaction.

[0037] (3) After naturally cooling to room temperature, the reaction solution was centrifuged at 10,000 r / min, washed 3 to 5 times with twice distilled water and absolute ethanol, then dispersed and stored in absolute ethanol to obtain the PdRh catalyst.

[0038] figure 1Shown is the transmission electron microscope figure of the fuel cell PdRh catalyst prepared by the present embodiment, by figure 1 It can be se...

Embodiment 2

[0042] (1) Take 1.0 g P123 and 22.10 mg KI and dissolve them in 10 mL of double distilled water with stirring and ultrasonic; take 10.23 mg of potassium chloropalladate and stir and ultrasonically dissolve them in 10 mL of double distilled water; then take 5.90 mg of rhodium chloride and dissolve them in 10 mL mL of double distilled water, and finally mix the above three solutions evenly.

[0043] (2) Transfer the mixed solution to the liner of a 50 mL polytetrafluoroethylene reactor, put it into the reactor, place it in a drying oven, and react at 180°C for 10 hours to stop the reaction.

[0044] (3) After naturally cooling to room temperature, the reaction solution was centrifuged at 10,000 r / min, washed 3 to 5 times with twice distilled water and absolute ethanol, then dispersed and stored in absolute ethanol to obtain the PdRh catalyst.

[0045] Figure 4 Shown is the transmission electron microscope figure of the fuel cell PdRh catalyst prepared by the present embodimen...

Embodiment 3

[0049] (1) Take 1.0 g P123 and 40.42 mg KI and dissolve them in 10 mL of double distilled water with stirring and ultrasonic; take 10.42 mg of potassium chloropalladate and dissolve them in 10 mL of double distilled water with stirring and ultrasonic; then take 5.84 mg of rhodium chloride and dissolve them in 10 mL mL of double distilled water, and finally mix the above three solutions evenly.

[0050] (2) Transfer the mixed solution to the liner of a 50 mL polytetrafluoroethylene reactor, put it into the reactor, place it in a drying oven, and react at 180°C for 10 hours to stop the reaction.

[0051] (3) After naturally cooling to room temperature, the reaction solution was centrifuged at 10,000 r / min, washed 3 to 5 times with twice distilled water and absolute ethanol, then dispersed and stored in absolute ethanol to obtain the PdRh catalyst.

[0052] Figure 7 Shown is the transmission electron microscope figure of the fuel cell PdRh catalyst prepared by the present embo...

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Abstract

The invention relates to preparation method, morphology control and application of a PdRh catalyst for a fuel cell. The method employs a hydrothermal reduction synthesis technology. The synthesis method comprises the following steps of dissolving a three-segment copolymer P123 in secondary distilled water; adding a potassium chloropalladite, rhodium chloride and potassium iodide solution into theP123 solution, and performing ultrasonic stirring and uniform mixing; transferring a mixed solution to an inner container of a 50mL polytetrafluoroethylene reaction kettle, placing the reaction kettlein a drying box, and performing reaction for 2-24 hours under 120-200 DEG C; and naturally cooling to a room temperature, and obtaining the PdRh catalyst for the fuel cell after centrifugal washing for 3 to 5 times. The P123 is used as a protection agent and a reduction agent, potassium iodide is used as a morphology control agent, the obtained PdRh catalyst has relatively good dispersion performance, is endowed with different special morphologies and a multi-stage structure, has excellent methanol catalytic oxidation performance, anti-poisoning performance and durability and is the catalysthaving great development prospect.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to catalyst synthesis, shape regulation and electrocatalytic performance, and in particular to a preparation method, shape regulation and application of a PdRh catalyst for fuel cells. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a device that directly converts fuel chemical energy into electrical energy through electrode reactions, and its energy conversion efficiency is not limited by the Carnot cycle, as high as 60-80%. At present, the catalysts used in fuel cells are mainly Pt-based catalysts, but Pt reserves are small, the amount used is large, the price is expensive, it is easy to poison, the catalytic stability is poor, and the fuel is easy to permeate. Although Pd has the most similar electronic structure to Pt, the price and storage of Pd have great advantages over Pt, and Pd shows very low CO poisoning. In alkaline systems, it exhibits cata...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/92
CPCH01M4/8825H01M4/92H01M4/921Y02E60/50
Inventor 周新文张荣华罗来明陈迪胡青云
Owner CHINA THREE GORGES UNIV
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