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Membrane-free oxygen-free direct methanol fuel cell with three-dimensional gradient structure anode and preparation method

A methanol fuel cell and gradient structure technology, applied in battery electrodes, structural parts, circuits, etc., can solve the problems of methanol fuel waste, increased battery cost, and reduced battery performance, so as to improve performance, catalyst utilization, and catalyst consumption. Reduced effect

Active Publication Date: 2021-06-11
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the working process of a membrane-free oxygen-free direct methanol fuel cell, when the anode uses high-concentration methanol fuel, part of the methanol permeates into the cathode through the electrolyte before it can fully react, resulting in a mixed potential, which not only leads to a decrease in battery performance , but also caused the waste of methanol fuel, which increased the cost of the battery to a certain extent

Method used

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  • Membrane-free oxygen-free direct methanol fuel cell with three-dimensional gradient structure anode and preparation method

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Experimental program
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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, cut the appropriate size of the anode diffusion layer for processing. Weighed 22 mg, 12 mg, and 7 mg of PtRuAu / C catalysts with metal loadings of 80%, 60%, and 40%, respectively, mixed them with 100 μL Nafion emulsion and 900 μL deionized water, and dispersed them ultrasonically for 6 hours to form a uniform catalyst slurry. Weigh the mass m of the bare anode diffusion layer (①) 0 , the PtRuAu / C catalyst slurry with a metal loading of 80% was coated on the anode diffusion layer, and then dried in a vacuum oven to obtain the first catalytic layer CL 1 (②), weigh its mass m 1 , get CL 1 The loading capacity of the upper catalyst is 10.0mg / cm 2 ; PtRuAu / C catalyst slurry with 60% metal loading was coated on CL 1 and placed in a vacuum oven to dry to obtain the second catalytic layer CL 2 (③), call its mass m 2 , get CL 2 The loading amount of the upper catalyst is 5.0mg / cm 2 ; PtRuAu / C catalyst slurry with 40% metal loading was coated on...

Embodiment 2

[0034]Cut the appropriate size of the anode diffusion layer for processing. Weighed 20 mg and 10 mg of PtRuAu / C catalysts with metal loadings of 70% and 40%, respectively, mixed with 100 μL Nafion emulsion and 900 μL deionized water, and then ultrasonically dispersed for 4 h to form a uniform catalyst slurry. Weigh the mass m of the bare anode diffusion layer 0 , the PtRuAu / C catalyst slurry with a metal loading of 70% was coated on the anode diffusion layer, and then dried in a vacuum oven to obtain the first catalytic layer CL 1 , weigh its mass m 1 , get CL 1 The loading capacity of the upper catalyst is 9.0mg / cm 2 ; PtRuAu / C catalyst slurry with 40% metal loading was coated on CL 1 and placed in a vacuum oven to dry to obtain the second catalytic layer CL 2 , call its mass m 2 , get CL 2 The loading amount of the upper catalyst is 5.0mg / cm 2 , thus making a three-dimensional gradient structure anode.

[0035] Mix 18 mg of carbon black powder with 100 μL mL Nafion ...

Embodiment 3

[0038] Cut the appropriate size of the anode diffusion layer for processing. Weighed 15 mg, 6 mg, and 2 mg of PtRuAu / C catalysts with metal loadings of 70%, 60%, and 40%, respectively, mixed them with 100 μL Nafion emulsion and 900 μL deionized water, and dispersed them ultrasonically for 5 h to form a uniform catalyst slurry. Weigh the mass m of the bare anode diffusion layer 0 , the PtRuAu / C catalyst slurry with a metal loading of 70% was coated on the anode diffusion layer, and then dried in a vacuum oven to obtain the first catalytic layer CL 1 , weigh its mass m 1 , get CL 1 The loading amount of the upper catalyst is 7.0mg / cm 2 ; PtRuAu / C catalyst slurry with 60% metal loading was coated on CL 1 and placed in a vacuum oven to dry to obtain the second catalytic layer CL 2 , call its mass m 2 , get CL 2 The loading amount of the upper catalyst is 3.0mg / cm 2 ; PtRuAu / C catalyst slurry with 40% metal loading was coated on CL 2 and placed in a vacuum oven to dry to o...

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Abstract

The invention relates to a three-dimensional gradient structure anode for a filmless oxygen-free direct methanol fuel cell and a preparation method thereof. The anode is a three-dimensional gradient structure obtained by gradient coating of PtRuM / C catalysts with different metal loads on the anode diffusion layer . Compared with the prior art, the anode of the present invention makes the fuel react completely when it reaches the electrode side close to the electrolyte, thereby avoiding the adverse effect on battery performance caused by the anode methanol fuel penetrating into the electrolyte and further penetrating into the cathode; The fuel utilization rate is increased, the catalyst utilization rate is increased, and the catalyst dosage is reduced, thereby improving the performance of the battery and reducing the cost of the battery. The three-dimensional gradient structure anode of the present invention is applied to the filmless and oxygen-free direct methanol fuel cell, so that the battery can use high-concentration methanol fuel on the anode, improves the performance of the battery, and is beneficial to the commercialization and application of the battery.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a three-dimensional gradient structure anode of a filmless oxygen-free direct methanol fuel cell and a preparation method thereof. Background technique [0002] Direct methanol fuel cells (DMFCs) use methanol as the anode fuel and oxygen as the cathode oxidant to convert chemical energy into electrical energy. Because of its high energy conversion efficiency, safety and portability, the reaction products are carbon dioxide and water, environmental protection and pollution-free, etc. It has become a research hotspot in recent years. [0003] Expensive proton exchange membrane and slow cathodic oxygen reduction reaction are two technical problems restricting the commercial application of DMFCs. Although the use of Pt / C catalyst greatly speeds up the oxygen reduction reaction and thus greatly improves the performance of DMFCs, its expensive price and scarce resources...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/8642H01M4/8828Y02E60/50
Inventor 原鲜霞
Owner SHANGHAI JIAOTONG UNIV
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