Synthesis and Ionic Conductivity of Lanthanum-based Ceria Ce1−xLaxO2−δ Electrolytes for Solid Oxide Fuel Cell Applications

Author:

S Seema,T ThangeshORCID,T.R Rajasekaran,S Nagarajan,Venkatachalam Sabarinathan

Abstract

In advanced low temperature solid oxide fuel cell (LT-SOFC) technology, we present a comprehensive study on the effects of lanthanum co-substitution in ceria electrolyte. Using a co-precipitation synthesis approach, we successfully incorporated trivalent La ions into the ceria matrix to improve its structural and functional properties. This study investigates La3+ doped CeO2 solid electrolytes (LDC) synthesis and characterization at varying concentrations (0.2, 0.3, 0.4, and 0.5). The materials were characterized using a suite of analytical techniques. X-ray diffraction (XRD) analysis revealed that all samples maintained a cubic fluorite-type structure with evident changes in peak intensity and broadening as La3+ ion concentration increased, indicative of induced lattice defects FT-IR spectra indicated minor modifications in the Ce-O bond vibrational modes. Optical studies demonstrated enhanced absorption in the UV region and a consistent band gap of 3.15 eV across all samples, underscoring the doping's influence on electronic transitions. Scanning electron microscopy (SEM) images highlighted increased grain sizes and improved interparticle connectivity, which is essential for material performance. X-ray fluorescence spectroscopy verified the existence of cerium and lanthanum, proving the successful addition of dopants. Raman spectroscopy also confirmed changes in the structure, indicating alterations in the characteristic vibrational frequencies and a decrease in their intensity as the dopant concentration increased. The conductivity of the material was tested at low temperatures ranging from 573 K to 873 K for use in Solid Oxide Fuel Cells, with the highest conductivity recorded at 0.21 mS/cm at 873 K.

Publisher

Asian Research Association

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3