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固體氧化物燃料電池La0.6Sr0.4Co0.2Fe0.8-xScxO3-?陰極材料的晶體結構與電化學性能
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1.內蒙古科技大學材料與冶金學院;2.內蒙古包頭市昆都侖區(qū)阿爾丁大街7號

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TM911.4 ??????????????

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國家自然科學基金項目（51974167）；內蒙古自治區(qū)高等學校創(chuàng)新團隊發(fā)展計劃支持（No.NMGIRT2215）


Crystal structure and electrochemical performance of La0.6Sr0.4Co0.2Fe0.8-xScxO3-? cathode materials for solid oxide fuel cell
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國家自然科學基金項目（51974167）；內蒙古自治區(qū)高等學校創(chuàng)新團隊發(fā)展計劃支持（No.NMGIRT2215）

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    摘要:

    采用溶膠-凝膠法合成了Sc摻雜La0.6Sr0.4Co0.2Fe0.8-xScxO3-?(LSCFScx, x=0, 0.04, 0.08)陰極粉體，系統(tǒng)分析了LSCFSc陰極材料的晶體結構、表面元素化學形態(tài)、催化活性及電化學性能。XRD結果表明，LSCF為立方結構，Sc3+摻雜后LSCFSc陰極材料由立方相向六方結構轉變。LSCFSc陰極材料的電導率隨著Sc3+的摻雜而降低，在300-800 ℃溫度范圍內LSCFSc0.08陰極樣品的電導率仍大于100 S/cm。XPS結果表明Sc3+摻雜提高了LSCFSc陰極材料表面吸附氧(OAds)的含量，LSCFSc0.08陰極材料在800℃測得的極化面電阻RASR為0.026 Ω·cm2，相比LSCF陰極材料RASR降低了約87.6%，顯著改善了LSCFSc陰極材料對氧氣的吸附/解離能力，提升了對氧氣的催化活性。以Ni-SDC為陽極材料，SDC為電解質，LSCFSc0.08為陰極材料組裝成Ni-SDC|SDC|LSCFSc0.08陽極支撐型單電池，在800℃時最大功率密度為806mW/cm2，表明Sc3+摻雜可以顯著提升陰極材料的電化學性能。

    Abstract:

    The Sc-doped La0.6Sr0.4Co0.2Fe0.8-XScxO3-? (LSCFScx, x=0, 0.04, 0.08) cathode powders were synthesized by a sol-gel method. The crystal structure, chemical morphology of surface elements, catalytic activity and electrochemical properties of LSCFSc cathode material were systematically analyzed.XRD results show that LSCF has a cubic structure, and the LSCFSc cathode material changes from cubic to hexagonal structure.The conductivity of LSCFSc cathode material decreases with the Sc3+-doping, and the conductivity of LSCFSc0.08 cathode sample is still greater than 100 S/cm in the temperature range of 300-800.XPS results show that Sc3+-doping increases the content of adsorbed oxygen (OAds) on the surface of LSCFSc cathode material, and the RASR of polarization surface of LSCFSc0.08 cathode material measured at 800℃ is 0.026 Ω·cm2, which is about 87.6% lower than RASR of LSCF cathode material, which significantly improved the adsorption/dissociation ability of LSCFSc cathode material to oxygen, and enhanced the catalytic activity of oxygen.Ni-SDC as the anode material, SDC as electrolyte, and LSCFSc0.08 as cathode material assembled into Ni-SDC|SDC|LSCFSc0.08 anode-support single cell, the maximum power density is 806 mW/cm2 at 800 ℃, indicating that Sc3+-doping can significantly improved the electrochemical performance of cathode materials.

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蔡長焜,謝滿意,王林,薛柯,彭軍,包金小,安勝利.固體氧化物燃料電池La0.6Sr0.4Co0.2Fe0.8-xScxO3-?陰極材料的晶體結構與電化學性能[J].稀有金屬材料與工程,2023,52(2):601~608.[caichangkun, xiemanyi, wanglin, xueke, pengjun, baojinxiao, anshengli. Crystal structure and electrochemical performance of La0.6Sr0.4Co0.2Fe0.8-xScxO3-? cathode materials for solid oxide fuel cell[J]. Rare Metal Materials and Engineering,2023,52(2):601~608.]
DOI：10.12442/j. issn.1002-185X.20220008

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  • 收稿日期:2022-01-05
  • 最后修改日期:2022-03-06
  • 錄用日期:2022-03-28
  • 在線發(fā)布日期: 2023-03-09
  • 出版日期: 2023-02-28