LaNi_(0.6)Fe_(0.4)O_(3)阴极接触材料导电特性调控及其对SOFC电化学性能的影响  

LaNi_(0.6)Fe_(0.4)O_(3) Cathode Contact Material:Electrical Conducting Property Manipulation and Its Effect on SOFC Electrochemical Performance

作　　者：张琨[1] 王宇[1] 朱腾龙 孙凯华 韩敏芳[3] 钟秦[1] ZHANG Kun;WANG Yu;ZHU Tenglong;SUN Kaihua;HAN Minfang;ZHONG Qin(School of Chemistry and Chemical Engineering,Nanjing University of Science&Technology,Nanjing 210094,China;Xuzhou Huatsing Jingkun Energy Co.,Ltd.,Xuzhou 221005,China;Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]南京理工大学化学与化工学院,南京210094 [2]徐州华清京昆能源有限公司,徐州221005 [3]清华大学能源与动力工程系,北京100084

出　　处：《无机材料学报》2024年第4期367-373,共7页Journal of Inorganic Materials

基　　金：国家重点研发计划项目(2018YFB1502203);江苏省碳达峰碳中和科技创新专项(BE2022029)。

摘　　要：鉴于平板式固体氧化物燃料电池(SOFC)电堆对低面电阻、高稳定性阴极接触材料的需求,本研究阐明了LaNi_(0.6)Fe_(0.4)O_(3)(LNF)颗粒尺寸调控对导电和SOFC单电池性能演变的影响机制,优化了LNF预处理工艺,降低了接触组件面电阻,提升了SOFC单电池性能及热循环稳定性。结果表明:预压造粒的样品(LNF-2)与高温烧结预处理的样品(LNF-3)的面电阻更小,分别为0.074和0.076Ω·cm^(2);在750℃施加1 A/cm^(2)电流负载后,能够更快地进入稳态,并保持颗粒尺寸稳定。其中,LNF-2单电池在750℃下的峰值功率密度0.94 W/cm^(2)较未处理的LNF的0.66 W/cm^(2)高,但在热循环过程中性能衰减较大,下降了20%;而LNF-3单电池在20次热循环后峰值功率密度仅下降了4%。本研究对高可靠SOFC电堆装配及其长寿命稳定运行具有指导及参考价值。In order to fulfil the requirement of low area specific resistance and highly stable cathode contact material in planar type solid oxide fuel cell(SOFC)stack assembling,this work investigated the electrical property evolution of LaNi_(0.6)Fe_(0.4)O_(3)(LNF)with manipulated particle size and its effect on SOFC electrochemical performance.The optimized pre-treatment strategies of LNF were obtained with decreasing ASR,improving SOFC single cell performance and thermal cycling stability.Results show that,the dry-pressed LNF-2 and the high-temperature sintering-pre-treated LNF-3 possess smaller area specific resistances of 0.074 and 0.076Ω·cm^(2),respectively,more stable particle sizes with shorter conditioning state and faster transfer into steady state after applying 1 A/cm^(2) current load at 750℃.Specifically,the single cell with LNF-2 shows improved peak power density of 0.94 W/cm^(2) compared to 0.66 W/cm^(2) of LNF without treatment at 750℃.However,it exhibits significant performance degradation during thermal cycling,decreasing by 20%.In contrast,the peak power density of LNF-3 single cell decreases by only 4%after 20 thermal cycles.This work is expected to provide guideline and valued reference for reliable SOFC stack assembling and stable operation.

关 键 词：固体氧化物燃料电池(SOFC) 阴极接触材料 LaNi_(0.6)Fe_(0.4)O_(3) 热循环 

分 类 号：TQ174[化学工程—陶瓷工业]