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Non-film type direct borohydride fuel cell pack

A technology of fuel cell stack and borohydride, which is applied in the direction of fuel cells, fuel cell additives, fuel cell grouping, etc., can solve the problems of high cost, low fuel cell efficiency, complex structure, etc., and achieve low cost, simple structure, The effect of high work efficiency

Inactive Publication Date: 2009-03-18
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, the problems faced by the batteries involved in the above two patents are still the complex structure and high cost caused by the use of noble metal catalysts and ion exchange membranes, as well as the low efficiency of fuel cells

Method used

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  • Non-film type direct borohydride fuel cell pack
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Examples

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preparation example Construction

[0027] 1) Preparation of breathable membrane

[0028] First, mix acetylene black and polytetrafluoroethylene according to the mass ratio of 20-80:20-80, then use absolute ethanol to ultrasonically disperse until viscous, and form a film after repeated rolling, with a thickness of 0.1-0.5mm;

[0029] 2) Preparation of cathode

[0030] First, the catalyst (iron phthalocyanine or cobalt phthalocyanine), carbon carrier (one or more mixtures of activated carbon, carbon nanotubes and acetylene black) and binder (polytetrafluoroethylene, PTFE, polyvinyl alcohol, PVA ) is mixed according to the mass ratio of 10-40:30-50:10-60 and added with absolute ethanol to make a paste mixture, and the paste mixture is applied to one side of the current collector by smearing method, which can reduce material transmission resistance, significantly reducing the internal resistance of the battery. Then, on the other side of the current collector, a gas-permeable film with a thickness of 0.2-0.8 mm ...

Embodiment 1

[0037] Figure 4 Performance curve of a direct borohydride fuel cell with cobalt phthalocyanine as the cathode catalyst. The electrode preparation process is as follows: the oxygen electrode uses cobalt phthalocyanine as the cathode catalyst, and the composition of the catalytic layer is mixed according to the weight ratio of cobalt phthalocyanine, activated carbon, and binder = 20:50:70, and then coated on the foam nickel roller after dispersion pressed into a catalytic layer. Diffusion layer composition: acetylene black: adhesive = 70:30 weight ratio mixed, rolled into a film. The catalytic layer and the diffusion layer were made into an oxygen electrode with a thickness of about 0.6mm under the cold pressure condition of 2Mpa. The loading of cobalt phthalocyanine in the oxygen electrode is 3.5 mg.cm -2 ; The hydrogen electrode uses a hydrogen storage alloy as the anode catalyst. The alloy powder is mixed with additives and binders evenly, and then coated on the nickel f...

Embodiment 2

[0041] Figure 5 The discharge performance curve of a direct borohydride fuel cell stack consisting of four single cells with iron phthalocyanine as the cathode catalyst. The electrode preparation process and working conditions are the same as in Example 1, the fuel flow rate is 6mL / min, and the air compressor is 10L / min. It can be seen from the performance curve that the battery stack of the present invention obtains a maximum power of 2.2W under the above test conditions, and the voltage at this time is 1.4V.

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Abstract

The invention relates to a leptomonasform direct borohydride fuel cell stack, which comprises an electrode, a bipolar plate, fuel cavities, end plates and a fastening device, wherein the fuel cavities are arranged between the cathodes and the anodes of monocells, any proton exchange membranes are not adopted. The cell stack is formed through connecting the monocells in series by the bipolar plate. Fuel and oxygen (air) respectively enter through a fuel hole and a gas hole on one of the end plates, fuel enters the fuel cavity of each monocell, oxygen (air) enters each monocell in turn along a gas flow field on the bipolar plate after entering, and fuel solution and gas after reacting respectively flow out from the fuel hole and the gas hole on the other end plate. The continuous supplies of fuel and oxygen (air) are achieved through other accessory equipment (such as a peristaltic pump, a peristaltic pump and the like). Since the leptomonasform direct borohydride fuel cell stack directly adopts cathode catalyst with high selectivity to achieve a leptomonasform fuel cell structure, the production cost is lowered in a greater degree, and meanwhile, the speed of electrochemical reaction is further improved, thereby improving the property of a cell.

Description

technical field [0001] The invention relates to a fuel cell stack directly supplying liquid fuel and air / oxygen from the outside, especially a filmless direct borohydride fuel cell stack. Background technique [0002] In today's world of rapid economic development, energy crisis and environmental problems are two urgent problems facing mankind, and the development of resource-saving and environment-friendly new technologies has become a major issue. A fuel cell is a device that directly converts the chemical energy of fuel into electrical energy by electrochemical reaction without combustion. It does not need to go through the Carnot heat engine cycle, is not limited by Carnot's maximum energy conversion efficiency theory, and has high energy conversion efficiency. Fuel cells are considered to be the most promising power sources due to their high energy conversion efficiency, environmental friendliness, and safe operation. [0003] Traditional proton exchange membrane fuel...

Claims

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Application Information

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IPC IPC(8): H01M8/24H01M8/04H01M4/90H01M8/2465
CPCY02E60/50Y02P70/50
Inventor 柳永宁马金福魏学东
Owner XI AN JIAOTONG UNIV
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