烧结助剂对BaZr_(0.1)Ce_(0.7)Y_(0.2)O_(3)–δ电解质烧结行为及电导率的影响  

Effect of Sintering Additives on Sintering Behavior and Conductivity of BaZr_(0.1)Ce_(0.7)Y_(0.2)O_(3)–δElectrolytes

作　　者：张婧慧 陆晓彤 毛海雁 田亚州 张山林 ZHANG Jinghui;LU Xiaotong;MAO Haiyan;TIAN Yazhou;ZHANG Shanlin(School of Chemical Engineering and Technology,Sun Yat-sen University,Zhuhai 519082,China)

机构地区：[1]中山大学化学工程与技术学院,珠海519082

出　　处：《无机材料学报》2025年第1期84-90,共7页Journal of Inorganic Materials

基　　金：国家重点研发计划(2021YFB4001402)。

摘　　要：BaZr_(0.1)Ce_(0.7)Y_(0.2)O_(3)–δ(BZCY)作为质子导体型固体氧化物燃料电池的典型电解质材料之一,具有高质子电导率及高稳定性等优点。然而,BZCY电解质的烧结活性较差,通常需要较高的烧结温度来实现致密化,而过高的烧结温度不利于电池的制备及应用。本研究旨在降低BZCY电解质的烧结温度,通过引入NiO、Fe_(2)O_(3)、ZnO与CuO等烧结助剂,探讨了烧结助剂对BZCY烧结行为的影响。结果表明,除Fe_(2)O_(3)外,其余氧化物均能有效促进BZCY烧结体的晶粒生长。其中,添加CuO对BZCY烧结过程的促进作用最显著。在BZCY中添加质量分数2%的CuO(BZCY-2%CuO)后,即使烧结温度降低至1250℃,烧结体仍能保持高于98%的相对密度。此外,在600℃的加湿H_(2)气氛下,BZCY-2%CuO的电导率高达2.7×10^(–2)S·cm^(–1),且在加湿H_(2)下的电导率相较于加湿空气高出近5倍。更为关键的是,BZCY-2%CuO电解质在电池工作条件下的电子导电性可以忽略不计,保持了优异的稳定性。As one of the typical electrolyte materials for proton conducting solid oxide fuel cells,BaZr_(0.1)Ce_(0.7)Y_(0.2)O_(3)–d(BZCY)possesses advantages such as high proton conductivity and stability.However,sintering activity of BZCY electrolyte is poor,usually requiring high sintering temperature for densification,which is inconducive to the preparation and application in cells.This study aimed to reduce the sintering temperature of BZCY electrolyte and explore the influence of sintering additives such as NiO,Fe_(2)O_(3),ZnO,and CuO on the sintering characteristics of BZCY in detail.The results indicate that the oxides except Fe2O3 can effectively promote the grain growth of BZCY sintered body.Among them,the addition of CuO has the most significant promoting effect on the sintering process of BZCY.After adding 2%(in mass)CuO into BZCY(BZCY-2%CuO),even if the sintering temperature was reduced to 1250℃,the relative density of the sintered body still maintained higher than 98%.Additionally,the conductivity of BZCY-2% CuO was up to 2.7×10^(–2) S·cm^(–1) at 600℃in wet H2 atmosphere,which was nearly 5 times higher than that in wet air.More importantly,BZCY-2% CuO electrolyte exhibits negligible electronic conductivity under cell operating conditions while maintaining excellent stability.

关 键 词：质子导体型固体氧化物燃料电池 BaZr_(0.1)Ce_(0.7)Y_(0.2)O_(3)–δ 电解质 烧结助剂 烧结行为 电导率 

分 类 号：TQ174[化学工程—陶瓷工业]