(Pr0.9La0.1)2(Ni0.74Cu0.21Ga0.05)O4+δ纳米纤维阴极的制备及电化学性质
Preparation and Electrochemical Properties of (Pr0.9La0.1)2(Ni0.74Cu0.21Ga0.05)O4+δ Nanofiber Cathode
作者单位E-mail
盛双 黑龙江大学化学化工与材料学院, 功能无机材料化学教育部重点实验室, 哈尔滨 150080  
赵嘉琪 哈尔滨工程大学国际合作教育学院, 哈尔滨 150001  
孙丽萍 黑龙江大学化学化工与材料学院, 功能无机材料化学教育部重点实验室, 哈尔滨 150080 lipingsun98@yahoo.com 
霍丽华 黑龙江大学化学化工与材料学院, 功能无机材料化学教育部重点实验室, 哈尔滨 150080  
赵辉 黑龙江大学化学化工与材料学院, 功能无机材料化学教育部重点实验室, 哈尔滨 150080  
摘要: 采用静电纺丝法制备了(Pr0.9La0.12(Ni0.74Cu0.21Ga0.05)O4+δ(PLNCG)氧化物纳米纤维。利用热重-差热分析(TG-DTA)、X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)和扫描电子显微镜(SEM)对材料的物相及微观形貌进行分析。研究表明950℃煅烧5 h得到平均直径420 nm、形貌均一的PLNCG氧化物纤维;1 000℃烧结2 h得到紧密附着在Ce0.9Gd0.1O2-δ(CGO)电解质上的网状结构纤维阴极。电化学阻抗谱(EIS)测试结果表明纳米纤维阴极具有比粉体阴极更优越的性能。700℃的极化电阻(RP)为0.134 Ω·cm2,比同组分的粉末阴极减少32%(RP=0.197 Ω·cm2)。以纤维阴极构筑的电解质支撑单电池Ni-CGO/CGO/PLNCG在700℃的最大输出功率密度为231 mW·cm-2。氧分压测试结果表明阴极反应的速率控制步骤为电荷转移过程。
关键词: IT-SOFC  PLNCG  纳米纤维阴极  电极反应
基金项目: 国家自然科学基金(No.51302069,51372073)、黑龙江省自然科学基金(No.E2016051)和人事部留学人员科技活动择优资助项目(No.2014-240)资助。
Abstract: The oxide nanofiber (Pr0.9La0.1)2(Ni0.74Cu0.21Ga0.05)O4+δ (PLNCG) is prepared by electrospinning technique. The phase and morphology evolution of the oxide nanofiber are characterized by Thermo-gravimetric-Differential thermal analysis (TG-DTA), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM), respectively. The results show that PLNCG nanofiber with an average diameter of 420 nm is produced after sintering the precursors at 950℃ for 5 h. The nanofiber cathode is formed with mesh-like morphology and keep good contact with the Ce0.9Gd0.1O2-δ (CGO) electrolyte after heat-treated at 1 000℃ for 2 h. The electrochemical impedance spectrum (EIS) results indicate that the nanofiber cathode exhibits superior performance than the powder cathode. The polarization resistance (RP) of the nanofiber cathode is 0.134 Ω·cm2 at 700℃ in air, which is 32% less than the PLNCG powder cathode (RP=0.197 Ω·cm2). The maximum power density of electrolyte-support single cell with PLNCG nanofiber cathode (Ni-CGO/CGO/PLNCG) reaches 231 mW·cm-2 at 700℃. The oxygen partial pressure measurement indicates that the charge transfer process is the reaction rate-limiting step of the nanofiber cathode.
Keywords: intermediate temperature solid oxide fuel cell (IT-SOFC)  PLNCG  nanofiber cathode  electrode reaction
投稿时间:2017-08-25 修订日期:2017-10-24
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盛双,赵嘉琪,孙丽萍,霍丽华,赵辉.(Pr0.9La0.1)2(Ni0.74Cu0.21Ga0.05)O4+δ纳米纤维阴极的制备及电化学性质[J].无机化学学报,2018,34(2):247-254.
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