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Self-breathing direct methanol fuel cell monomer based on porous metal fiberboard

A methanol fuel cell and porous metal technology, applied in fuel cells, fuel cell parts, solid electrolyte fuel cells, etc., can solve problems such as battery performance degradation, fuel waste, etc., to improve alcohol resistance performance and provide mass transfer resistance , The effect of reducing fuel waste

Inactive Publication Date: 2012-01-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the problem of fuel waste and battery performance degradation caused by high methanol permeability in current direct methanol fuel cells, the present invention provides a passive self-breathing direct fuel cell based on porous metal fiber plates that has good alcohol resistance and can effectively increase the energy density of the battery. methanol fuel cell

Method used

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  • Self-breathing direct methanol fuel cell monomer based on porous metal fiberboard
  • Self-breathing direct methanol fuel cell monomer based on porous metal fiberboard
  • Self-breathing direct methanol fuel cell monomer based on porous metal fiberboard

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preparation example Construction

[0040] The preparation method of the porous metal fiber board is as follows: the copper metal raw material is made into a continuous fiber filament with a diameter of 20 μm-200 μm by cutting method, and then the metal fiber is cut into a fiber segment with a length of 10 mm-20 mm. Then, the loose fiber segment is placed in the mold for preparing the porous metal fiber board, the cavity structure of the mold is the same as the shape of the porous metal fiber board; the layer-by-layer tiling method is used to ensure that the fiber and the voids formed are evenly distributed. After the mold is assembled, it can be placed in a nitrogen atmosphere protection sintering furnace for sintering. The sintering temperature is 800°C-950°C and the sintering time is 30min-90min. After sintering, the porosity is 70%-80%, the average pore size is 50μm-500μm, and the permeability is 10 -12 m 2 -10 -9 m 2 , A porous metal fiberboard with a thickness of 0.5mm-5mm.

[0041] Good water manageme...

Embodiment 1

[0044] The copper metal raw material is made into a continuous fiber with a diameter of 100 μm by a cutting method, and then the metal fiber is cut into a fiber segment with a length of 10 mm to 20 mm. Then, 36.7g of loose fiber segments were placed in the mold for preparing the porous metal fiberboard; the layer-by-layer tiling method was used to ensure that the fibers and the voids formed by them were evenly distributed. After the mold is assembled, it is placed in a sintering furnace protected by a nitrogen atmosphere, and sintered at 900°C for 30 minutes. After sintering, a porous metal fiber board with a porosity of 80% can be prepared. The average pore diameter of the porous metal fiber plate measured by the bubble method is 120 μm, and the permeability is 2×10 -10 m 2 .

[0045] Such as figure 2 Shown is a 50-fold enlarged SEM image of the porous metal fiber plate 5 with a porosity of 80%. The porous metal fiber board 5 is sintered by metal fibers, and the fiber s...

Embodiment 2

[0048] The copper metal raw material is made into a continuous fiber with a diameter of 20 μm by a cutting method, and then the metal fiber is cut into a fiber segment with a length of 10 mm to 20 mm. Then, the loose fiber segment is placed in the mold for preparing the porous metal fiber board; the layer-by-layer tiling method is adopted to ensure that the fiber and the voids formed by it are evenly distributed. After the mold was assembled, it was placed in a sintering furnace protected by a nitrogen atmosphere, and sintered at 800°C for 60 minutes. After sintering, a porous metal fiber board with a porosity of 70% can be prepared. The average pore diameter of the porous metal fiber board measured by the bubble method is 37 μm, and the permeability is 1.2×10 -11 m 2 .

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Abstract

The invention discloses a self-breathing direct methanol fuel cell monomer based on a porous metal fiberboard. The cell monomer comprises an anode fuel chamber, a cell working unit and a cathode open type end plate, wherein the cell working unit comprises an anode collector plate, a membrane electrode and a cathode collector plate; two sides of the membrane electrode are respectively provided with the anode collector plate and the cathode collector plate; the anode fuel chamber and the cathode open type end plate used as a cell shell are respectively arranged at the outer sides of the anode collector plate and the cathode collector plate; the middle part of the anode collector plate is provided with a porous metal fiberboard, the porous metal fiberboard is formed by sintering copper metal fibers with diameter of 20-200 mu m, the porosity is 70%-90%, the permeability is 10<-12>-10<-9>m<2>, and the average pore size is 50 mu m to 500 mu m. According to the invention, because of the adoption of the porous metal fiberboard, the methanol penetration problem can be effectively solved and effective water management is realized, thus the fuel availability of the passive self-breathing direct methanol fuel cell can be improved and the output performance of the cell can be improved.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a passive self-breathing direct methanol fuel cell based on a porous metal fiber board. Background technique [0002] A direct methanol fuel cell (DMFC) is an electrochemical device that converts chemical energy directly into electrical energy using methanol as fuel. It has the characteristics of simple structure, safe fuel storage, high theoretical specific energy, and low temperature operation, so it has broad application prospects in the field of portable electronic products. Among them, the passive self-breathing direct methanol fuel cell can realize completely autonomous operation, its anode is directly connected to the fuel storage chamber (hereinafter referred to as the fuel chamber), the cathode is directly exposed to the natural air, and the fuel (methanol) and oxidant (oxygen) diffuse through the concentration difference Diffusion transfer forms such as convection a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M8/10H01M8/0232H01M8/1011
CPCY02E60/523Y02E60/50
Inventor 汤勇袁伟吴菊红万珍平
Owner SOUTH CHINA UNIV OF TECH
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