Oxygen exchange and transport in dual phase ceramic composite electrodes
Author:
Affiliation:
1. International Institute for Carbon Neutral Energy Research (wpi-I2CNER)
2. Kyushu University
3. Fukuoka
4. Japan
5. Department of Materials
Abstract
Composites consisting of a perovskite-based electronic or mixed conductor with a fluorite-structured ionic conductor are often used as electrodes in solid oxide electrochemical energy conversion devices. After sintering the materials, there is often evidence for inter-reaction between the two phases, or inter-diffusion of cations or impurities between the two phases. We studied the18O exchange properties of a composite consisting of CGO and LSCF in a 50 : 50 ratio. High resolution ToF-SIMS mapping reveals that the18O fraction at the very outer surface of grains of the CGO phase is much higher than expected fromD* andk* values for the single-phase parent material. Surface compositional analysis by ToF-SIMS and low energy ion scattering (LEIS) spectroscopy suggests that the surfaces of the CGO grains in the composite do not show the impurities which typically segregate to the surface in single-phase CGO. Thus, the “cleaning” of impurities from the CGO surface by dissolution into the perovskite phase may be one explanation for the apparent enhanced surface exchange for CGO in these composites.
Publisher
Royal Society of Chemistry (RSC)
Subject
Physical and Theoretical Chemistry
Link
http://pubs.rsc.org/en/content/articlepdf/2015/FD/C5FD00028A
Reference45 articles.
1. Mechanism of oxygen electrode delamination in solid oxide electrolyzer cells
2. La2Zr2O7 formation and oxygen reduction kinetics of the La0.85Sr0.15MnyO3, O2(g)|YSZ system
3. Reaction mechanism between lanthanum manganite and yttria doped cubic zirconia
4. Cathode Materials for Reduced-Temperature SOFCs
5. Electrochemical performance of (La,Sr)(Co,Fe)O3–(Ce,Gd)O3 composite cathodes
Cited by 30 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
1. Enhanced stability of electrocatalytic properties against cathodic current polarization for chromium ferrite perovskite-based composite cathodes;International Journal of Hydrogen Energy;2024-02
2. Recent advances of perovskite oxide-based cathodes in solid oxide electrolysis cells for CO2 electroreduction;Materials Today Physics;2023-11
3. Effect of oxygen nonstoichiometry on electrical conductivity and oxygen transport parameters of Cu-substituted La0.5Sr0.5Co0.8Fe0.2O3-δ perovskite oxides;Journal of Solid State Electrochemistry;2023-07-08
4. Nanoscale Intertwined Biphase Nanofiber as Active and Durable Air Electrode for Solid Oxide Electrochemical Cells;ACS Sustainable Chemistry & Engineering;2023-05-29
5. Degradation study of La0.6Sr0.4Co1–Fe O3–δ based symmetric cells by means of impedance spectroscopy and oxygen isotope exchange;Solid State Ionics;2022-12
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