Ba掺杂的LSCM对称电极的制备及其在H2S-SOFC上的应用

摘要LSCM是一种较为成熟的钙钛矿型电极材料， Ba掺杂的LSCM其电性能将很大程度得到提高。本文采用溶胶凝胶法合成一系列Ba掺杂的LSCM ( La0.75Sr0.25-xBaxCr0.5Mn0.5O3 ，x=0, 0.1, 0.15, 0.2, 0.25 ) 对称电极，通过X射线衍射 ( XRD ) 表征，显示煅烧后得到的材料均具有典型的钙钛矿晶型，且与电解质YSZ化学相容性较好；通过SEM观察其微观形态，具备作为电极材料所必须的多孔性特征；对一系列电极材料进行电导率测试，材料的电导率随温度升高而增大；以x=0.15, 0.25为研究对象的LSBCM|YSZ|LSBCM电池体系，在2% H2S气氛下测试其电性能，其中x=0.25在900 ℃时，最大输出电功率可达15.5mW/cm2.60919

毕业论文关键词 H2S-SOFC， Ba掺杂，对称电极，耐硫，电性能

毕业设计说明书（论文）外文摘要

Title Synthesis of Ba-substituted LSCM symmetrical electrode material for symmetric solid oxide fuel cell with H2S-containing fuel

Abstract

LSCM is a relatively mature perovskite type electrode material. Barium-substituted for strontium in LSCM can greatly change the electric properties of electrode materials. In this paper, a series of Ba-substituted symmetric electrodes La0.75Sr0.25-xBaxCr0.5Mn0.5O3 (x=0, 0.1, 0.15, 0.2 and 0.25) was synthesized by sol-gel method. The structure were characterized by XRD, and they all exhibited orthorhombic perovskite-type structure and good chemical compatibility with YSZ. The microstructures were characterized by SEM, and they all had the porosity. On a range of electrode materials for electrical conductivity tests, which reflect the material conductivity, increased with the increased temperature. Battery system LSBCM | YSZ | LSBCM about x = 0.15 and 0.25 as the research object, and the maximum output power of x = 0.25 could reach 15.5 mW/cm2 in 2% H2S at 900 ℃.

Keywords H2S-SOFC, Ba-substitution , symmetrical electrode , sulfur tolerance , electric properties

摘要 Ⅰ

Abstract Ⅱ

1 引言 1

1.1课题研究背景 1

1.2燃料电池简介 2

1.2.1燃料电池组成及分类 2

1.2.2 SOFC工作原理 2

1.3 SOFC电池材料 3

1.3.1 电解质材料 3

1.3.2固体氧化物燃料电池的阳极材料 4

1.3.3固体氧化物燃料电池的阴极材料 4

2 La0.75Sr0.25-xBaxCr0.5Mn0.5O3系列电极材料的制备及性能研究 6

2.1 La0.75Sr2.5-xBaxCr0.5Mn0.5O3系列电极材料的制备 7

2.1.1 实验药品及仪器 7

2.1. 2 La0.75Sr2.5-xBaxCr0.5Mn0.5O3系列电极材料的制备方法 8

2.2 La0.75Sr2.5-xBaxCr0.5Mn0.5O3系列电极材料的表征 9

2.2.1 La0.75Sr0.25-xBaxCr0.5Mn0.5O3的物相分析 10

2.2.2化学相容性测试 11

2.2.3 H2S条件下稳定性测试 14

2.2.4电导率测试 18

3 固体氧化物燃料电池的制备及性能测试 21

3.1固体氧化物燃料电池的制备 21

3.1.1 实验药品及仪器 21 Ba掺杂的LSCM对称电极的制备及其在H2S-SOFC上的应用:http://www.751com.cn/huaxue/lunwen_66477.html