固体氧化物燃料电池用CeO<sub>2</sub>基电解质的研究进展

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Abstract As a high-efficiency energy conversion device, solid oxide fuel cell (SOFC) has attracted widely attention due to its high efficiency, environmental friendliness and fuel flexibility. As the critical part of SOFC, the performance of electrolyte directly determines the performance of SOFC. The electrolyte material commonly used in SOFC is partially yttria-stabilized zirconia (YSZ), but due to its high operating temperature (about 1 000 ℃), it brings difficulties in electrode material selection, sealing and so on. Therefore, the development of electrolytes suitable for low and intermediate temperature is essential to promote the commercialization of SOFC.
The conductivity of single element-doped ceria electrolyte is higher than that of YSZ at low and intermediate temperatures. However, the disadvantages of CeO₂-based electrolytes are that they exhibit electronic conduction due to reduction of Ce⁴⁺ to Ce³⁺at lower oxygen partial pressures environments as well as the decrease of total conductivity due to the high grain boundary resistance at low and medium temperatures. Many factors affect the conductivity of CeO₂-based electrolytes, such as the preparation method of the powder, the microscopic morphology of the sintered body, and the type and concentration of dopants. Among them, the more important factors are the type of doping elements and its concentration, the preparation method of the powder.
Inview of the above problems, researchers generally believe that co-doped or multi-doped (especially doping with rare earth elements) ceria which compared with single element-doping is more beneficial to improve the ionic conductivity of CeO₂-based electrolytes and inhibit electronic conductivity. In addition to element doping, ceria-based electrolytes composited with different carbonates have also attracted the interest of researchers. In terms of preparation methods, different powder preparation methods such as microwave sintering, polyols method, and electrostatic spinning can also be used to obtain electrolytes with high ionic conductivity. In addition, thinning the electrolyte to a film and depositing a layer membrane on the CeO₂-based electrolyte substrate by pulsed laser deposition (PLD) can reduce electronic conductivity and improve conductivity.
In this paper, based on the research status of CeO₂-based electrolyte in recent years, the influence of element doping, the preparation method of powder and electrolyte film on the electrical properties of CeO₂-based electrolyte is briefly described, and its development is prospected.

Key words： solid oxide fuel cell doped CeO₂ element doping powder preparation method ion conductivity

Published: 16 July 2021

CLC number:

TM285

About author:: Runze Liu, currently a graduate student in the School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, is conducting research under the guidance of Associate Professor Zhou Fen. At present, the main research is the preparation and performance research of rare earth doped CeO₂ electrolyte.Fen Zhou received her B.E, M.Sc. degrees in metallurgical engineering from Baotou Iron and Steel Institute in 1997, and from Inner Mongolia University of Science and Technology in 2006, respectively. Her research interests are oxygen ion conductors, mixed conductors and their devices. In recent years, more than 10 related academic papers have been published in domestic and foreign academic journals, such as Ceramics Internatio-nal and Chinese Journal of Ceramics.

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	LIU Runze
	ZHOU Fen
	WANG Qingchun
	GAO Jianquan
	BAO Jinxiao
	SONG Xiwen

Cite this article:

LIU Runze,ZHOU Fen,WANG Qingchun, et al. Research Progress of CeO₂-based Electrolytes for Solid Oxide Fuel Cells[J]. Materials Reports, 2021, 35(Z1): 29-32.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2021/V35/IZ1/29

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