Current collector for water electrolytic cell or fuel element with solid polymer electrolyte and associated method of production

FIELD: electricity.

SUBSTANCE: current collector for water electrolytic cell or fuel element with solid polymer electrolyte that consists of sintered titanium powder of spherical shape is arranged as multilayer. The first layer comprises powder particles, which are identical in size and are selected from the range of 5÷20 mcm, and subsequent layers contain powder particles that vary in size and are selected from the range of 5÷250 mcm. Maximum size of particles in each subsequent layer is more than maximum size of particles in the previous layer, besides content in layers of particles with size of 5÷20 mcm reduces down from 100 wt % in the first layer to 5-10 wt % in the last layer. Method for manufacturing of specified collector includes layer filling of titanium powder into mold and further sintering of layers, besides after each layer has been filled, its intermediate sintering is carried out at 800-950°C, and then all layers are finally sintered at 1000-1200°C.

EFFECT: improved porous structure of collector and increased efficiency of electrochemical systems operation.

4 cl

 

The present invention relates to the collector current and the method of its manufacturing. The current collectors are used in electrochemical devices, in particular in the electrolytic water intended for producing hydrogen and oxygen, as well as in fuel cells with solid polymer electrolyte.

Famous collectors DC-based sintered sponge or titanium powder of spherical shape, consisting of several layers of different fractional composition, and each layer has a uniform size distribution, namely one layer consists of small particles, the other from the middle, and the third of the large particles (see EP No. 1361010, B01D 39/20, 2003; EP NO. 1683594, B22F 5/00, 2006).

A method of obtaining collector current, including layer-by-layer filling of titanium powder in the form and then sintering the layers at temperatures 650-1200 K temperature range°C (see EP No. 1361010, B01D 39/20, 2003).

A disadvantage of the known collector current is limited flow of water towards the polymer membrane due to non-optimal porous structure of manifolds. This effect is particularly evident when the operation of the water electrolyzer at high current densities (>2 cm2), in electrolysis systems with cathodic water supply. In addition, this property is largely reduces the operating parameters of an electrochemical system with a solid polymer electrolyte in resumewriting of the fuel element.

The technical result that can be obtained from the use of the claimed inventions is to improve the porous structure of the manifold, providing a solution to the problem of water supply of electrochemical systems, and improving the efficiency of their work.

This technical result is achieved by using the collector current of the water electrolyzer or fuel cell with a solid polymer electrolyte of sintered titanium powder is spherical, made of a multilayer, and the first layer of powder, which is located to the membrane has a uniform particle size of the powder is selected from a range of 5÷20 μm, and the subsequent layers contain different sizes of powder particles selected from a range of 5÷250 μm, the maximum particle size in each subsequent layer is greater than the maximum particle size of the previous layer, and the content in the layers of particles with a size of 5÷20 µm decreases from 100% wt. in the first layer to 5-10% wt. in the last layer.

A method of manufacturing a collector current includes a layer-by-layer filling of titanium powder in the form and then sintering the layers after each layer of backfill perform intermediate sintering at between 800 and 950°C and then spend the final sintering of all layers at 1000-1200°C.

The intermediate and final sintering implemented Aut without loading the intermediate sintering is carried out for 15-20 min, and the final sintering is carried out in a period of 50-60 minutes

A method of manufacturing a collector current of the water electrolyzer or fuel cell with a solid polymer electrolyte is illustrated by the following example.

Poured the first layer of spherical titanium powder brand W-1.0 fraction of 10 μm to form the layer thickness is ≈0,04 mm Produce alignment layer press the puck and carry out a preliminary sintering of the layer by heating in a vacuum (vacuum not less than 5·10-3PA) or in an inert gas environment at a temperature of 920-940°C for 15 min without loading.

Fall asleep the second layer of spherical titanium powder brand W-1.0, consisting of 15 wt.%. from fraction 5 μm, 15% wt.% from the faction of 20 μm and 70% wt.% of fractions of 50 μm, in the form on top of the first layer, the layer thickness is ≈0,1 mm Produce alignment layer press the puck and carry out a preliminary sintering of the second layer by heating in a vacuum (vacuum not less than 5·10-3PA) or in an inert gas environment at a temperature of 920-940°C for 20 min without loading.

Poured a third layer of spherical titanium powder brand W-1.0, consisting of 20 wt.%. from the faction of 20 μm, 30% Mas μm and 50% wt. from the faction 125 μm, in the form on top of the second layer, the thickness of the third layer ≈0,2 mm. Produce the alignment layer of the press washer and assests who have pre-sintering of the third layer by heating in a vacuum (vacuum not less than 5·10 -3PA) or in an inert gas environment at a temperature of 920-940°C for 15 min without loading.

Fall asleep fourth layer of spherical titanium powder brand W-1.0, consisting of 5 wt.%. from the faction of 20 μm, 15% by weight. of fractions of 50 μm and 80% wt. from the faction 200 μm, in the form on top of the third layer, the thickness of the fourth layer is ≈0,4 mm. Produce alignment layer press the puck and carry out a preliminary sintering of the fourth layer by heating in a vacuum (vacuum not less than 5·10-3PA) or in an inert gas environment at a temperature of 920-940°C for 15 min without loading.

Then spend the final sintering of the sample collector current with biporous structure in a vacuum oven (vacuum not less than 5·10-3PA or in inert gas) at a temperature of 1060-1080°C for 60 min without load. After cooling, remove the sample from the form.

The resulting collector current is biporous structure, i.e. it has a system of pores with different diameters, providing the pores are filled with water under different operation modes. This effect is achieved in an optimized distribution of the porous structure in the cross section due to the use of layers of titanium powder AC fractional composition of from 5 to 250 microns.

1. The collector current of the water electrolyzer or fuel cell with a solid polymer electrolyte, sustasis sintered titanium powder of spherical shape, executed multi-layered, wherein the first layer has a uniform particle size of the powder is selected from a range of 5÷20 μm, and the subsequent layers contain different sizes of powder particles selected from a range of 5÷250 μm, the maximum particle size in each subsequent layer is greater than the maximum particle size of the previous layer, and the content in the layers of particles with a size of 5÷20 µm decreases from 100 wt.%, in the first layer of 5-10 wt.% in the last layer.

2. A method of manufacturing a collector current according to claim 1, including a layer-by-layer filling of titanium powder in the form and then sintering the layers, characterized in that after filling each layer perform intermediate sintering at between 800 and 950°C and then spend the final sintering of all layers at 1000-1200°C.

3. A method of manufacturing a collector current according to claim 2, characterized in that the intermediate and final sintering carried out without loading.

4. A method of manufacturing a collector current according to claim 2, characterized in that the intermediate sintering is carried out for 15-20 min, and the final sintering is carried out in a period of 50-60 minutes



 

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Fuel element // 2361328

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