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Ca摻雜LNF陰極材料的制備與電化學(xué)性能改善
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內(nèi)蒙古科技大學(xué)材料與冶金學(xué)院 內(nèi)蒙古包頭市

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中圖分類號(hào):

TM911.4

基金項(xiàng)目:

國家自然科學(xué)(51974167)


Preparation and Electrochemical Performance Improvement of Alkaline Earth Metal Ca Doped LNF Cathode
Author:
Affiliation:

School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou,Inner Mongolia

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    近年來，LaNi0.6Fe0.4O3-δ陰極材料在金屬連接體下具有優(yōu)異的抗鉻毒化性能備受關(guān)注，但其電化學(xué)性能相對(duì)較低。本文通過Ca2+摻雜LaNi0.6Fe0.4O3-δ（LNF）陰極材料改善電化學(xué)性能，實(shí)驗(yàn)采用甘氨酸燃燒法制備La1-xCaxNi0.6Fe0.4O3-δ（LCNF）陰極材料,Ca2+摻雜量分別為0.05、0.10、0.15、0.20。應(yīng)用X-Ray衍射表征材料的物相組成，SEM觀察陰極材料的微觀結(jié)構(gòu)，XPS分析陰極材料表面元素的化學(xué)形態(tài)，電化學(xué)交流阻抗譜技術(shù)分析陰極材料的電化學(xué)活性。結(jié)果表明，LCNF陰極材料隨著Ca2+摻雜量的增加，氧還原反應(yīng)活化能減小，這一現(xiàn)象與DRT（弛豫時(shí)間分布）分析結(jié)果相吻合。LCNF(x=0.20)陰極材料在750℃具有最小的極化阻抗（0.88Ωcm2），與LNF陰極材料相比表現(xiàn)出更加優(yōu)異的氧催化活性，使LCNF陰極材料在IT-SOFC具有更加廣闊的應(yīng)用前景。

    Abstract:

    In recent years, LaNi0.6Fe0.4O3-δcathode materials have pay a attention to chromium poisoning performance under metal interconnects, but it has relatively low electrochemical performance. This paper improves the electrochemical performance of LNF cathode by Ca doping, La1-xCaxNi0.6Fe0.4O3-δ(x=0、0.05、0.10、0.15、0.20) cathode material was prepared by a glycine combustion method. The phase composition of the material was characterized by X-Ray diffraction. The microstructure of the cathode material was observed by SEM. The chemical forms of elements on the surface of cathode materials was analyzed by XPS.The electrochemical activity of the cathode material was analyzed by an AC impedance spectroscopy. The results show that the activation energy of oxygen reduction reaction decreases with the increase of Ca2+ doping content in La1-xCaxNi0.6Fe0.4O3-δcathode material, which is consistent with the DRT (Distribution of relaxation times) analysis. The La0.8Ca0.2Ni0.6Fe0.4O3-δcathode material has the lowest polarization resistance (0.88 Ωcm2) at 750℃, and exhibits more excellent oxygen catalytic activity than the undoped LNF material, making the LCNF cathode have a broader application prospect in IT-SOFC.

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謝滿意,蔡長(zhǎng)焜,安勝利,郜建全,薛柯. Ca摻雜LNF陰極材料的制備與電化學(xué)性能改善[J].稀有金屬材料與工程,2020,49(9):3099~3106.[Manyi Xie, Changkun Cai, Shengli An, Jiangquan Gao, Ke Xue. Preparation and Electrochemical Performance Improvement of Alkaline Earth Metal Ca Doped LNF Cathode[J]. Rare Metal Materials and Engineering,2020,49(9):3099~3106.]
DOI：10.12442/j. issn.1002-185X.20190785

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  • 收稿日期:2019-09-24
  • 最后修改日期:2019-12-25
  • 錄用日期:2020-01-03
  • 在線發(fā)布日期: 2020-10-15
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