Ca^(2+)/Pr^(3+)共掺Ce_(0.8)Sm_(0.2)O_(2-δ)电解质的制备及其离子导电性能研究  

Preparation of Ca^(2+)/Pr^(3+)Co-Doped Ce_(0.8)Sm_(0.2)O_(2-δ) Electrolyte with Study Ionic Conductivity Performance

作　　者：梁佳敏 徐梦姣[1] 黄岭 潘晓剑 彭永利 LIANG Jiamin;XU Mengjiao;HUANG Ling;PAN Xiaojian;PENG Yongli(State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources,School of Chemistry,Xinjiang University,Urumqi Xinjiang 830017,China)

机构地区：[1]新疆大学化学学院省部共建碳基能源资源化学与利用国家重点实验室,新疆乌鲁木齐830017

出　　处：《新疆大学学报（自然科学版中英文）》2024年第6期657-664,共8页Journal of Xinjiang University(Natural Science Edition in Chinese and English)

基　　金：国家重点研发计划“非电行业复杂工况烟气深度净化稀土脱硝催化剂研发及应用”(2021YFB3500600);新疆维吾尔自治区自然科学基金“二元铋基/碳纤维复合材料的制备及其光催化性能研究”(2022D01C72).

摘　　要：氧化铈基电解质被认为是中低温理想的固体氧化物燃料电池电解质之一.其中Sm3+掺杂氧化铈Ce_(0.8)Sm_(0.2)O_(2-δ)(SDC)电解质表现出良好的离子电导率和稳定性.但长期低氧分压环境下,体系中部分Ce4+易被还原为Ce3+而产生一定的电子电导,造成电池内局部短路,材料的离子电导率随之降低.基于上述现状,采用共掺杂策略,通过溶胶凝胶法制备Ca^(2+)/Pr^(3+)共掺SDC电解质材料,以期进一步改善Ce^(4+)的还原问题.通过多种表征手段对该系列材料的物相组成、微观形貌及电化学性能进行分析.实验结果表明:Ce_(0.8)Sm_(0.1)Pr_(0.08)Ca_(0.02)O_(2-δ)(PCSDC2)电解质在离子活化能降低的同时致密度得到一定的提升.600℃时,PCSDC2电解质的离子电导率较原有SDC提升了2.90倍.Cerium oxide-based electrolyte is considered as one of the ideal solid electrolytes in the low and medium temperature region.Among them,Sm3+doped cerium oxide Ce_(0.8)Sm_(0.2)O_(2-δ)(SDC) electrolyte shows good ionic conductivity and stability.However,in the long-term low oxygen partial pressure environment,part of Ce^(4+) in the system are easy to be reduced to Ce^(3+)and produce a certain electronic conductivity,resulting in a local short circuit inside the battery and a subsequent decrease in the ionic conductivity of the materials.Based on the above problems,Ca^(2+)/Pr^(3+) co-doped SDC electrolyte materials were prepared by sol-gel method using the co-doping strategy with a view to further improving the reduction of Ce^(4+).The physical phase composition,microscopic morphology and electrochemical properties of this series of materials were analyzed by various characterization means.The experimental results show that the Ce_(0.8)Sm_(0.1)Pr_(0.08)Ca_(0.02)O_(2-δ) electrolyte have a certain enhancement of densities while the ionic activation energies are reduced.At 600℃,the ionic conductivity of PCSDC2 electrolyte enhance 2.90 times higher than that of the SDC electrolyte.

关 键 词：固体氧化物燃料电池 氧化铈基电解质 掺杂 氧空位 离子电导率 

分 类 号：O646[理学—物理化学]