Mg掺杂Mn1.5Cr1.5O<sub>4</sub>固体氧化物燃料电池阴极材料的性能研究

季炤宇; 马奔; 周盈科

文章摘要

Mg掺杂Mn1.5Cr1.5O₄固体氧化物燃料电池阴极材料的性能研究

Performance of Mg-doped Mn1.5Cr1.5O₄ as the cathode for solid oxide fuel cell

投稿时间：2022-09-07

DOI：

中文关键词: 固体氧化物燃料电池尖晶石氧化物阴极 Mg掺杂氧还原反应

英文关键词: SOFC spinel oxide cathode Mg-doping oxygen reduction reaction

基金项目:国家自然科学基金青年基金项目(51902230)；国家自然科学基金面上项目 (51974209).

作者	单位	E-mail
季炤宇	武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉,430081	1285628522@qq.com
马奔	武汉科技大学理学院,湖北武汉,430081
周盈科	武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉,430081

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中文摘要:

固体氧化物燃料电池(solid oxide fuel cell, SOFC)阴极材料的高稳定性、高催化性能是其获得商业化应用的前提。尖晶石氧化物具有良好的稳定性与兼容性,这使得其成为最具发展潜力的SOFC阴极材料之一。本文通过Mg掺杂对尖晶石氧化物Mn1.5Cr1.5O₄阴极材料进行改性处理,研究了Mg掺杂量对Mn1.5Cr1.5-xMgxO₄ (x=0,0.075,0.150,0.225)阴极材料微观结构、物相组成、电导率、热膨胀系数及其作为对称电池阴极时电化学性能等方面的影响。结果表明,当Mg掺杂量x为0.150时,Mn1.5Cr1.35Mg0.15O₄具有最大的电导率和最小的极化阻抗,在800 ℃下分别可达0.168 S/cm和1.84 Ω·cm²,表明适量的Mg掺杂不仅提高了Mn1.5Cr1.5O₄阴极材料的电化学性能,而且还能加快氧气分子在其表面的吸附解离过程。

英文摘要:

The high stability and catalytic performance of cathode materials for solid oxide fuel cells (SOFC) are prerequisites for the commercial application of SOFC. Spinel oxides, with their excellent stability and compatibility, have become one of the most promising cathodes for SOFC.This study modified the spinel oxide Mn1.5Cr1.5O₄ cathode material through Mg-doping. The effects of Mg-doping amount on the microstructure, phase composition, conductivity, thermal expansion coefficient, and electrochemical performance of Mn1.5Cr1.5-xMgxO₄ (x=0,0.075,0.150,0.225) as a symmetrical cell cathode were investigated. The results demonstrate that when the Mg-doping amount x is 0.150, Mn1.5Cr1.35Mg0.15O₄ exhibits the highest conductivity and the lowest polarization impedance, reaching 0.168 S/cm and 1.84 Ω·cm² at 800 ℃, respectively. This indicates that the appropriate amount of Mg-doping not only enhances the electrochemical performance of Mn1.5Cr1.5O₄ but also accelerates the adsorption and dissociation process of oxygen molecules on its surface.

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