Solid electrolyte type fuel cell and air electrode current collector used for the same

Abstract

A solid electrolyte type fuel cell which incorporates a metal separator comprising a base material of a metal other than silver or a silver alloy which is plated with silver or a silver alloy. The fuel cell can achieve improved efficiency for electricity generation with no increase of the resistance of the metal separator, even when it is operated at a low temperature.

Description

technical field

[0001] The present invention relates to a solid electrolyte type fuel cell having a power generation cell (cell) composed of a fuel electrode layer and an air electrode layer sandwiching an electrolyte layer and having a high operating output density even at low temperatures, and relates to a fuel cell of the solid electrolyte type used in such a An air electrode current collector on a solid electrolyte fuel cell operating at low temperature. Background technique

[0002] In general, solid electrolyte fuel cells can be used as fuels such as hydrogen, natural gas, methanol, and coal gas, so they can promote the use of petroleum in power generation, and because waste heat can be used, they are also valued from the perspective of resource conservation and environmental issues. .

[0003] This solid electrolyte fuel cell has a laminated structure as shown in the exploded perspective view of FIG. 1 and the schematic sectional view of FIG. 2 . That is, the solid ...

Examples

Embodiment 1～3

[0076] First, pure silver atomized powder having an average particle diameter of 2 μm was prepared. The pure silver atomized powder is a powder obtained by melting pure silver in a common melting furnace and atomizing the obtained pure silver solution. And prepare n-hexane as organic solvent, sodium dodecylbenzenesulfonate (hereinafter referred to as DBS) as surfactant, hydroxypropylated cellulose methyl ether (hereinafter referred to as HPMC) as water-soluble resin binder, glycerin As plasticizer, distilled water as water.

[0077] Then, put pure silver atomized powder and HPMC (water-soluble resin binder) into a strong shear mixer and stir for 30 minutes, then add 50% of the mass of distilled water that must be added for stirring. Add the remaining 50% distilled water and other additives—n-hexane (organic solvent), DBC (surfactant) and glycerin (plasticizer) and stir for 3 hours to make a mass ratio of 50.0% pure silver atomized powder , n-hexane 1.5%, HPMC 5.0%, DBS 2.0%,...

Embodiment 4～6

[0087] Except for using Sc-stabilized zirconia to form a solid electrolyte layer, the same metal separators as in Examples 1 to 3 were used, respectively, and fuel cells were produced in the same manner as in Examples 1 to 3.

[0088] Sc-stabilized zirconia was produced by the following method. to Sc 2 o 3 and ZrOCl 2 As the initial raw material, in the hydrolysis of ZrOCl 2 Monoclinic ZrO after aqueous solution 2 A given amount of Sc was added to the sol 2 o 3 As an aqueous solution of nitric acid, urea was added and maintained at 90°C to uniformly precipitate, and the precipitate was calcined at 600°C. Sc-stabilized zirconia was obtained by sintering the calcined body at 1400° C. for one hour.

Embodiment 7～9

[0092] In addition to using 8% Y 2 o 3 Doped with ZrO 2 powder and use Y-stabilized zirconia to form a solid electrolyte layer, respectively adopt the same metal separators as in Examples 1-3, and manufacture fuel cells in the same manner as in Examples 1-3.

[0093] Y-stabilized zirconia was produced by the following method. to Y 2 o 3 and ZrOCl 2 As the initial raw material, after adding water to decompose ZrOCl 2 Monoclinic ZrO after aqueous solution 2 A given amount of Y was added to the sol 2 o 3 As an aqueous solution of nitric acid, urea was added and maintained at 90°C to uniformly precipitate, and the precipitate was calcined at 600°C. Y-stabilized zirconia was obtained by sintering the calcined body at 1400° C. for one hour.

technical field

[0001] The present invention relates to a solid electrolyte type fuel cell having a power generation cell (cell) composed of a fuel electrode layer and an air electrode layer sandwiching an electrolyte layer and having a high operating output density even at low temperatures, and relates to a fuel cell of the solid electrolyte type used in such a An air electrode current collector on a solid electrolyte fuel cell operating at low temperature. Background technique

[0002] In general, solid electrolyte fuel cells can be used as fuels such as hydrogen, natural gas, methanol, and coal gas, so they can promote the use of petroleum in power generation, and because waste heat can be used, they are also valued from the perspective of resource conservation and environmental issues. .

[0003] This solid electrolyte fuel cell has a laminated structure as shown in the exploded perspective view of FIG. 1 and the schematic sectional view of FIG. 2 . That is, the solid ...

Examples

Embodiment 1～3

[0076] First, pure silver atomized powder having an average particle diameter of 2 μm was prepared. The pure silver atomized powder is a powder obtained by melting pure silver in a common melting furnace and atomizing the obtained pure silver solution. And prepare n-hexane as organic solvent, sodium dodecylbenzenesulfonate (hereinafter referred to as DBS) as surfactant, hydroxypropylated cellulose methyl ether (hereinafter referred to as HPMC) as water-soluble resin binder, glycerin As plasticizer, distilled water as water.

[0077] Then, put pure silver atomized powder and HPMC (water-soluble resin binder) into a strong shear mixer and stir for 30 minutes, then add 50% of the mass of distilled water that must be added for stirring. Add the remaining 50% distilled water and other additives—n-hexane (organic solvent), DBC (surfactant) and glycerin (plasticizer) and stir for 3 hours to make a mass ratio of 50.0% pure silver atomized powder , n-hexane 1.5%, HPMC 5.0%, DBS 2.0%,...

Embodiment 4～6

[0087] Except for using Sc-stabilized zirconia to form a solid electrolyte layer, the same metal separators as in Examples 1 to 3 were used, respectively, and fuel cells were produced in the same manner as in Examples 1 to 3.

[0088] Sc-stabilized zirconia was produced by the following method. to Sc 2 o 3 and ZrOCl 2 As the initial raw material, in the hydrolysis of ZrOCl 2 Monoclinic ZrO after aqueous solution 2 A given amount of Sc was added to the sol 2 o 3 As an aqueous solution of nitric acid, urea was added and maintained at 90°C to uniformly precipitate, and the precipitate was calcined at 600°C. Sc-stabilized zirconia was obtained by sintering the calcined body at 1400° C. for one hour.

Embodiment 7～9

[0092] In addition to using 8% Y 2 o 3 Doped with ZrO 2 powder and use Y-stabilized zirconia to form a solid electrolyte layer, respectively adopt the same metal separators as in Examples 1-3, and manufacture fuel cells in the same manner as in Examples 1-3.

[0093] Y-stabilized zirconia was produced by the following method. to Y 2 o 3 and ZrOCl 2 As the initial raw material, after adding water to decompose ZrOCl 2 Monoclinic ZrO after aqueous solution 2 A given amount of Y was added to the sol 2 o 3 As an aqueous solution of nitric acid, urea was added and maintained at 90°C to uniformly precipitate, and the precipitate was calcined at 600°C. Y-stabilized zirconia was obtained by sintering the calcined body at 1400° C. for one hour.

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