Holmium oxide-scandium oxide compositely-stabilized zirconium oxide and preparation method thereof, and electrolyte material of solid oxide fuel cell

A technology for stabilizing zirconia and solid oxides, applied in scandium oxide/scandium hydroxide, fuel cells, preparation/processing of rare earth metal compounds, etc. Development and other issues, to achieve the effect of simple preparation method, excellent grain boundary conductivity, excellent ion conductivity

Pending Publication Date: 2021-10-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, yttria-stabilized zirconia has low conductivity and general mechanical properties as a solid electrolyte, which restricts the further development of solid oxide fuel cells

Method used

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  • Holmium oxide-scandium oxide compositely-stabilized zirconium oxide and preparation method thereof, and electrolyte material of solid oxide fuel cell
  • Holmium oxide-scandium oxide compositely-stabilized zirconium oxide and preparation method thereof, and electrolyte material of solid oxide fuel cell
  • Holmium oxide-scandium oxide compositely-stabilized zirconium oxide and preparation method thereof, and electrolyte material of solid oxide fuel cell

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preparation example Construction

[0042] A preparation method of holmium oxide and scandium oxide composite stabilized zirconia, comprising the following steps:

[0043] Heating the mixed aqueous solution of zirconium oxychloride, scandium oxide and holmium oxide, adjusting the pH to obtain a mixed slurry, and then filtering, washing, drying, calcining and grinding;

[0044] In the mixed aqueous solution, the molar ratio of zirconium ions, scandium ions and holmium ions is (92-93):(6-7):1.

[0045] Oxygen ions have the highest diffusion coefficient in cubic structure zirconia, and the corresponding ion conductivity is also the best. The appearance of the rhomboid structure seriously destroys the ion conductivity of zirconia materials. The present invention succeeds in doping with a specific amount of holmium oxide. The transition from scandium oxide-stabilized zirconia cubic structure to rhombohedral structure is suppressed, so that the obtained holmium oxide and scandium oxide composite stabilized zirconia ha...

Embodiment 1

[0082] A preparation method of holmium oxide and scandium oxide composite stabilized zirconia powder, comprising the following steps:

[0083] Weigh 6.44Kg zirconium oxychloride octahydrate and dissolve it in 1000L water in the enamel reaction kettle. The pH value of the solution after complete dissolution is figure 1 shown.

Embodiment 2

[0085] A preparation method of holmium oxide and scandium oxide composite stabilized zirconia powder, comprising the following steps:

[0086] Weigh 12.88Kg zirconium oxychloride octahydrate and dissolve it in 1000L deionized water in an enamel reactor. The pH value of the solution after complete dissolution is figure 2 shown.

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Abstract

The invention relates to the technical field of electrolyte materials of solid oxide fuel cells, in particular to holmium oxide-scandium oxide compositely-stabilized zirconium oxide and a preparation method thereof, and an electrolyte material of a solid oxide fuel cell. The preparation method of the holmium oxide-scandium oxide compositely-stabilized zirconium oxide comprises the following steps: heating a mixed aqueous solution of zirconium oxychloride, scandium oxide and holmium oxide, adjusting a pH value to obtain mixed slurry, and successively carrying out filtering, washing, drying, calcining and grinding, wherein in the mixed aqueous solution, a molar ratio of zirconium ions to scandium ions to holmium ions is (92-93): (6-7): 1. The method is simple and easy to implement, and the obtained holmium oxide-scandium oxide compositely-stabilized zirconium oxide has excellent ionic conductivity.

Description

technical field [0001] The invention relates to the technical field of electrolyte materials for solid oxide fuel cells, in particular to a composite stable zirconia of holmium oxide and scandium oxide, a preparation method thereof, and an electrolyte material for solid oxide fuel cells. Background technique [0002] Scandium oxide stabilized zirconia powder has the characteristics of small particle size, concentrated particle size distribution, high sintering activity and low specific surface area, and can be widely used in the current tape casting method for solid oxide fuel cell electrolyte substrates. In the prior art, yttria-stabilized zirconia as a solid electrolyte has low electrical conductivity and general mechanical properties, which restrict the further development of solid oxide fuel cells. [0003] In view of this, the present invention is proposed. Contents of the invention [0004] An object of the present invention is to provide a preparation method of hol...

Claims

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Application Information

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IPC IPC(8): C01G25/02C01F17/224C01F17/212C01F17/10H01M8/1253B82Y30/00
CPCC01G25/02C01F17/212C01F17/224C01F17/10H01M8/1253B82Y30/00C01P2004/82C01P2004/04C01P2004/03C01P2002/72C01P2006/40C01P2004/61C01P2004/32C01P2004/50Y02E60/50
Inventor 陶景超刘静何君杰
Owner SHANGHAI JIAO TONG UNIV
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