双钙钛矿氧化物中B位掺杂对固体氧化物燃料电池性能的影响  

B-site doping effect of double perovskite for cathodes of solid oxide fuel cells

作　　者：雷金勇 黄旭锐 崔景赠 夏梓汀 朱健秋 潘军 杨怡萍 于丰源 廖梓豪 王建强[2,4] 张宇轩 张林娟 LEI Jinyong;HUANG Xurui;CUI Jingzeng;XIA Ziting;ZHU Jianqiu;PAN Jun;YANG Yiping;YU Fengyuan;LIAO Zihao;WANG Jianqiang;ZHANG Yuxuan;ZHANG Linjuan(Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Guangzhou 510600,China;Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;Shanghai Normal University,Shanghai 200234,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]广东电网有限责任公司广州供电局,广州510600 [2]中国科学院上海应用物理研究所,上海201800 [3]上海师范大学,上海200234 [4]中国科学院大学,北京100049

出　　处：《核技术》2023年第6期68-76,共9页Nuclear Techniques

基　　金：南方电网公司科技项目(No.GZHKJXM20190109);中国科学院洁净能源先导科技专项(No.XDA2100000);国家重点研发计划(No.2021YFA1502400);国家自然科学基金(No.22179141);中国科学院创新研究院合作基金(No.DNL202008);中国科学院上海应用物理研究所育新计划(No.E055280101);碳中和光子科学中心资助。

摘　　要：作为氢燃料利用的核心器件,固体氧化物燃料电池(Solid Oxide Fuel Cell,SOFC)可以高效地将燃料气转化为电能。燃料电池中的阴极作为氧还原反应的发生场所,不仅对性能输出占有重要的影响,而且还是燃料电池的稳定性和寿命的关键决定因素。针对阴极材料的研究在推动燃料电池技术发展及产业化进程中具有重要意义。为了提升阴极的电化学性能,本文对双钙钛矿结构氧化物PrBa_(0.8)Ca_(0.2)Co_(2)O_(5+δ)(PBCC)中的钴元素进行掺杂调控,研究掺杂元素的种类、浓度对材料电化学性能的影响,通过电化学性能测试确定了最优的掺杂元素类型和含量。当使用掺杂5 mol%铁元素的PBCC材料作为阴极时,燃料电池在700℃的最大功率达到了1259 mW∙cm^(-2),远优于未掺杂时的988 mW∙cm^(-2)。对掺杂元素含量和种类的优化有助于提升固体氧化物燃料电池的电化学性能。[Background]The performance of solid oxide fuel cells(SOFCs)can be promoted by optimizing cathode materials.[Purpose]This study aims to boost the electrochemical performances of cathodes for SOFCs by doping transition metal at the B-site of double perovskite.[Methods]Firstly,a series of B-site doped PrBa_(0.8)Ca_(0.2)Co_(2)O_(5+δ)(PBCC)oxides as cathodes for SOFCs were prepared by sol-gel.The effects of B-site doped content and doped elements on the crystalline structure of the cathodes were analyzed by X-ray diffraction(XRD)and scanning electron microscope(SEM).Then,the trends of conductivity and thermal expansion coefficient with Bsite doped PBCC oxides were investigated.Finally,the electrochemical performances of cathodes with different Bsite doped PBCC oxides were tested to find optimal doping element type and content.[Results]Test results show that polarization is reduced and the electrochemical catalytic activity is improved when 5 mol%of Fe is doped on the Bsite of the PBCC cathode.Compared to the PBCC cathode,the max power density of the full cell with a 5-mol%Fedoped cathode increases from 988 mW∙cm^(-2) to 1259 mW∙cm^(-2) at 700℃.[Conclusions]The electrochemical performances of SOFCs can be boosted by modifying the B-site of double perovskite using transition metal.

关 键 词：固体氧化物燃料电池 阴极 双钙钛矿 B-位掺杂 

分 类 号：TL99[核科学技术—核技术及应用]