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A high-performance oxygen reduction catalyst for practical methanol fuel cells

A methanol fuel cell and catalyst technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of easy CO poisoning, poor methanol resistance, unfavorable growth of two-dimensional nanostructures, etc., and achieve excellent catalytic performance and good stability Effect

Active Publication Date: 2022-04-22
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cathode catalyst (Pt-based is recognized as the catalyst with the best cathode oxygen reduction performance) with slow kinetics, poor methanol resistance, and easy CO poisoning
Two-dimensional nanostructures have high volume ratio of surface metal atoms and low coordination atoms, however, due to inherent physicochemical properties such as lattice mismatch and redox potential, the growth of two-dimensional nanostructures is thermodynamically unfavorable.

Method used

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  • A high-performance oxygen reduction catalyst for practical methanol fuel cells
  • A high-performance oxygen reduction catalyst for practical methanol fuel cells
  • A high-performance oxygen reduction catalyst for practical methanol fuel cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Synthetic Bi 2 Te 3 Nanosheets, stored in ethanol;

[0019] (2) Take step (1) to obtain Bi 2 Te 3 Nanosheets (0.005 mmol) in a Petri dish, add ethylene glycol, the dosage is 10 ml, stirred at room temperature for 10 min;

[0020] (3) Add 0.01mmol sodium tetrachloropalladiumate and 0.0025mmol chlorohydrauric acid in the mixed solution in step (2), stir at room temperature for 15min and put into a dark room, and shine with visible light (40W table lamp, tungsten filament as a light source) for 2 hours;

[0021] (4) The resulting product of step (3) is cooled and washed, and after centrifugation and separation, PdAuBiTe alloy nanosheets are obtained, and the samples are dispersed and stored in ethanol.

Embodiment 2

[0023] (1) Synthetic Bi 2 Te 3 Nanosheets, stored in ethanol;

[0024] (2) Take step (1) to obtain Bi 2 Te 3 Nanosheets (0.005 mmol) were added to a Petri dish, ethylene glycol was added, the dosage was 15 ml, and stirred at room temperature for 10 min;

[0025] (3) Add 0.01mmol sodium tetrachloropadiumate and 0.0025mmol chlorohydraulic acid trihydrate to the mixed solution in step (2), stir at room temperature for 15min and put it into a dark room, and illuminate with a 40W desk lamp for 4 hours;

[0026] (4) The resulting product of step (3) is cooled and washed, and after centrifugation and separation, PdAuBiTe alloy nanosheets are obtained, and the samples are dispersed and stored in ethanol.

Embodiment 3

[0028] (1) Synthetic Bi 2 Te 3 Nanosheets, stored in ethanol;

[0029](2) Take step (1) to obtain Bi 2 Te 3 Nanosheets (0.005 mmol) in a Petri dish, add ethylene glycol, the dosage is 7 ml, stirred at room temperature for 10 min;

[0030] (3) Add 0.01mmol sodium tetrachloropalladiumate and 0.0025mmol chlorohydraulic acid trihydrate in the mixed solution in step (2), stir at room temperature for 15min and put it into a dark room, and shine with a 40W table lamp for 2 hours;

[0031] (4) The resulting product of step (3) is cooled and washed, and after centrifugation and separation, PdAuBiTe alloy nanosheets are obtained, and the samples are dispersed and stored in ethanol.

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Abstract

The invention discloses a high-performance oxygen reduction catalyst used in an actual methanol fuel cell, which is characterized in that a Pd-based quaternary alloy is synthesized for the first time without adding a surfactant and a reducing agent by using a template method induced by visible light Nanosheets are about 5nm in thickness and larger than 500nm in diameter. By testing the X-ray diffraction spectrum, its crystal configuration is face-centered cubic. In an actual methanol fuel cell, the power density of PdAuBiTe alloy nanosheets is 235.7 mW cm ‑2 , is 2.32 times that of commercial carbon-supported platinum, and is the highest value reported in the current literature. In the constant current stability test, the voltage of PdAuBiTe alloy nanosheets dropped only 15% for 15h, while the commercial carbon-supported platinum dropped 55.1%.

Description

Technical field [0001] The present invention relates to a high-performance oxygen reduction catalyst for an actual methanol fuel cell. Background [0002] Methanol is easily available, stored, and has a high energy density, and direct methanol fuel cells are expected to become a conversion device for renewable energy to alleviate the energy crisis and greenhouse effect. Cathode catalysts (Pt groups are recognized as the catalysts with the best cathodic oxygen reduction performance) have slow kinetics, poor methanol resistance, and are prone to CO poisoning. Two-dimensional nanostructures have surface metal atoms with high volume ratios and low coordination atoms, but due to inherent physicochemical properties such as lattice mismatch and redox potential, it is not conducive to the growth of two-dimensional nanostructures in thermodynamics. Contents of the Invention [0003] The technical problem to be solved by the present invention is: to provide a visible light-induced templa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92
CPCH01M4/928Y02E60/50
Inventor 袁强赵凤玲杨晓彤
Owner GUIZHOU UNIV
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