Preparation and electric properties of La0.6Sr0.4-xCaxCo1-yNiyO3-δ composite doped perovskite oxide cathode

LI Yan; LUO Zhongyang; YU Chunjiang; WEI Xinli; CEN Kefa

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Preparation and electric properties of La_0.6Sr_0.4-xCa_xCo_1-yNi_yO_3-δ composite doped perovskite oxide cathode

更新时间：2025-12-10

- Preparation and electric properties of La_0.6Sr_0.4-xCa_xCo_1-yNi_yO_3-δ composite doped perovskite oxide cathode
- CIESC Journal Issue 5, (2007)
- 作者机构：
  
  1. 郑州大学化学工程学院
  2. 浙江大学热能工程研究所能源清洁利用国家重点实验室
- 作者简介：
- 基金信息：
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- Online First：05 May 2007，
  
  Published：05 May 2007
- 稿件说明：
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LI Yan, LUO Zhongyang, YU Chunjiang, et al. Preparation and electric properties of La_0.6Sr_0.4-xCa_xCo_1-yNi_yO_3-δ composite doped perovskite oxide cathode[J]. CIESC Journal, 2007, (5).
DOI：

LI Yan, LUO Zhongyang, YU Chunjiang, et al. Preparation and electric properties of La_0.6Sr_0.4-xCa_xCo_1-yNi_yO_3-δ composite doped perovskite oxide cathode[J]. CIESC Journal, 2007, (5). DOI：

摘要

采用固相反应法合成了中温固体氧化物燃料电池新型复合掺杂阴极La0.6Sr0.4-xCaxCo1-yNiyO3-δ（LSCCN）钙钛矿材料。借助XRD对不同掺杂含量所制备的粉体的成相过程和晶体结构进行了研究。实验结果表明：当x=0.4时，Ca元素已经不能很好的掺入到LaCoO3晶格中去。Ni元素含量较小的情况下，不会影响材料的晶体结构，不过当NiO含量稍有增高，制备的粉体的结构发生了明显的变化，已不再具有钙钛矿型的晶体结构，出现了较强的四方K2NiF4结构的LaSrCoO4衍射峰。将制备的LSCCN粉体掺入一定的淀粉和粘结剂制备成固体氧化物燃料电池（SOFC）的阴极。在空气气氛下使用直流四探针法测量了样品从100℃到800℃的电导率值，发现LSCCN系列材料中保持了钙钛矿结构的阴极片具有很高的电导率值，其中Ca2+和Sr2+掺杂各半的情况下制备的阴极片的电导率值最高。掺入较多的Ca2+或较多的Ni2+不仅影响了材料的单一的晶体结构，并且大大降低了材料的电导率值。

Abstract

Composite doped ITSOFC(Intermediate Temperature Solid Oxide Fuel Cell ) cathode material of La0.6Sr0.4-xCaxCo1-yNiyO3-δ（LSCCN）was synthesized through solid-phase reaction.The crystal structure and forming process of LSCCN powder were investigated with XRD.The experimental results showed that Ca2+ could not be well mixed into the LaCoO3 lattice when x was 0.4.The crystal structure of the material was stable when the metal molar percentage of Ni was less than 5%

but it lost the single perovskite phase structure and presented the square K2NiF4 phase of LaSrCoO4 when the content of Ni increased.The SOFC(Solid Oxide Fuel Cell) cathode wafers could be made by mixing a specific amount of amylum and ethylic cellulose with LSCCN cathode powder.The electrical conductivity of the samples was measured by using the four-probe DC method from 100℃ to 800℃ in atmosphere.The electrical conductivity of the cathode wafers with perovskite structure was higher than 105 S·m-1

in which the electrical conductivity of the La0.6Sr0.2Ca0.2Co0.9Ni0.1O3-δ samples could reach 57701 S·m-1 when heated up to 800℃.The sample single crystal lattice structure changed significantly and its electrical conductivity decreased considerably when the molar percentage of Ca2+ or Ni2+ increased.

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