Doped cerium oxide-based solid oxide fuel cell and preparation method thereof

A solid oxide and fuel cell technology, applied in the direction of fuel cells, circuits, electrical components, etc., can solve problems such as hindering the application, and achieve the effect of increasing the open circuit voltage, simple and effective process, efficient and stable work

Active Publication Date: 2017-06-13
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under the working conditions of the fuel cell, the Ce in the DCO 4+ ions are reduced to Ce 3+ ions, the introduction of n-type electronic conductance in the electrolyte causes an internal short circuit in the battery section, hindering its application in SOFCs

Method used

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  • Doped cerium oxide-based solid oxide fuel cell and preparation method thereof
  • Doped cerium oxide-based solid oxide fuel cell and preparation method thereof
  • Doped cerium oxide-based solid oxide fuel cell and preparation method thereof

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preparation example Construction

[0058] The present invention also provides a preparation method of the doped ceria-based solid oxide fuel cell, which includes the following steps:

[0059] A) A green body with an anode support, an anode functional layer containing Ba and / or Sr and an electrolyte layer doped with cerium oxide is calcined at a high temperature at 1200-1400°C to obtain a half-cell ceramic chip; the calcining temperature is more Preferably it is 1350 degreeC.

[0060] B) Prepare a cathode layer on the surface of the electrolyte layer of the half-cell ceramic sheet obtained in step A), and obtain the doped ceria-based solid oxide fuel cell after sintering.

[0061] Preferably, the step A) is specifically:

[0062] 1) The anode support ceramic powder is mixed with the pore former, and the anode support ceramic green body is prepared by the dry pressing method;

[0063] 2) Disperse the anode functional layer ceramic powder on the anode support base, and prepare a double-layer ceramic green body with anode s...

Embodiment 1

[0083] Preparation of NiO-SDC|NiO-BZCY|SDC|SSC-SDC flat anode support SOFC

[0084] The electronic conductive phase NiO powder in the anode support and the anode functional layer is prepared by decomposition of basic nickel carbonate at 600°C, NiO-BaZr 0.1 Ce 0.7 Y 0.2 O 3-δ The (NiO-BZCY) composite ceramic powder is synthesized in one step by the citrate gel combustion method, and calcined in the air at 1000°C for 3 hours to obtain the NiO-BZCY composite powder. In addition, the electrolyte Ce 0.8 Sm 0.2 O 3-δ (SDC) and the electron conduction phase Sm in the cathode layer 0.5 Sr 0.5 CoO 3-δ (SSC) is also synthesized by the citrate combustion method and calcined in air at 600℃ and 950℃ for 3h.

[0085] After mixing the above-mentioned anode support NiO and SDC powder in a mass ratio of 60:40, adding 20% ​​starch, ball milling in ethanol for 12 hours, and drying in an oven at 80°C for 24 hours to obtain a uniformly mixed anode Support ceramic powder.

[0086] Take an appropriate ...

Embodiment 2

[0102] Example 2: Preparation of NiO-SCYb|NiO-SCYb|SDC|PSCF-SDC flat anode support SOFC

[0103] NiO-SrCe in anode support and anode functional layer 0.95 Yb 0.05 O 3-δ The (NiO-SCYb) composite ceramic powder is synthesized in one step by the citrate gel combustion method, and calcined in the air at 1000°C for 3 hours to obtain the NiO-SCYb composite powder. In addition, the electrolyte Ce 0.8 Sm 0.2 O 3-δ (SDC) and the electron conduction phase Pr in the cathode layer 0.6 Sr 0.4 Cu 0.2 Fe 0.8 O 3-δ (PSCF) is also synthesized by the citrate combustion method, and then calcined in the air at 600°C and 900°C for 3 hours.

[0104] The above-mentioned NiO-SCYb composite ceramic powder was added to starch with a mass fraction of 20%, and the mixture was uniformly mixed by ball milling in ethanol for 12 hours, and dried in an oven at 80° C. for 24 hours to obtain a uniformly mixed anode support ceramic powder.

[0105] Take an appropriate amount of the above-mentioned starch-containing ...

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Abstract

The invention provides a doped cerium oxide-based solid oxide fuel cell. The fuel cell comprises an anode support, an anode functional layer containing Ba and/or Sr, an electron blocking layer, an electrolyte layer doped with cerium oxide and a cathode layer, and the above parts orderly contact. The electron blocking layer is formed by co-sintering the anode functional layer and the electrolyte layer. The elements in the anode functional layer are diffused at a high temperature and react with the electrolyte layer in situ at the interface to form the electron blocking layer, which effectively improves the open circuit voltage of the cell, so that the cell can work efficiently and stably in the middle-low temperature range. Compared with the conventional method using the double-layer electrolyte and composite electrolyte, method provided by the invention is simple and effective and realizes superior cell performances. The doped cerium oxide-based solid oxide fuel cell provides a novel idea for promoting the development of middle-low-temperature solid oxide fuel cells.

Description

Technical field [0001] The invention relates to the technical field of fuel cells, in particular to a doped cerium oxide-based solid oxide fuel cell and a preparation method thereof. Background technique [0002] The solid oxide fuel cell (SOFC) is an energy conversion device that directly converts the chemical energy stored in the fuel into electric energy. Because it is not restricted by the Carnot cycle, it has high energy conversion efficiency, wide fuel adaptability, and environmental friendliness. , All-solid-state structure, safety and reliability and other advantages have attracted wide attention. It is considered to be a very competitive green power generation technology, which has broad application prospects in the fields of large-scale power stations, distributed power stations, household combined heat and power systems, automotive auxiliary power supplies, and portable mobile power supplies. [0003] At present, higher operating temperature (800-1000°C) is still an imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1213H01M8/1226H01M8/126
CPCH01M8/1213H01M8/1226H01M8/126H01M2008/1293Y02E60/50
Inventor 宫正孙文平单铎曹加锋武煜森苗利娜刘卫
Owner UNIV OF SCI & TECH OF CHINA
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