Sr_(0.95)Sc_(0.175)Nb_(0.025)Co_(0.8)O_(3-δ)负载Ag^(0)复合阴极的原位脱溶制备及性能  

In Situ Exsolution of Sr_(0.95)Sc_(0.175)Nb_(0.025)Co_(0.8)O_(3-δ)-Ag^(0) Composite Cathode for Proton-Conducting Solid Oxide Fuel Cell

作　　者：杨文宇 杨华庆 姜珊珊 洪涛 郭友敏[1] Yang Wenyu;Yang Huaqing;Jiang Shanshan;Hong Tao;Guo Youmin(School of Materials Science and Engineering,Anhui University,Hefei 230601,China;School of Energy and Power,Jiangsu University of Science and Technology,Zhenjiang 212100,China;School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]安徽大学材料科学与工程学院,安徽合肥230601 [2]江苏科技大学能源与动力学院,江苏镇江212100 [3]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《稀有金属》2023年第1期156-166,共11页Chinese Journal of Rare Metals

基　　金：安徽省教育厅重点项目(KJ2019A0018)资助。

摘　　要：本文首先采用溶胶-凝胶法合成出Ag0.05Sr_(0.95)Sc_(0.175)Nb_(0.025)Co_(0.8)O_(3-δ)(S_(0.95)SNC-Ag^(+))钙钛矿型氧化物,然后利用1%H2O-O2(体积分数)气氛对其进行原位脱溶,制备出Sr_(0.95)Sc_(0.175)Nb_(0.025)Co_(0.8)O_(3-δ)负载Ag0纳米颗粒(S_(0.95)SNC-Ag0)的复合阴极,并考察其作为质子导体固体氧化物燃料电池(H^(+)-SOFC)阴极材料时的电化学性能。通过X射线衍射(XRD)、直流四端子法、X射线光电子能谱(XPS)对原位脱溶前后材料的晶体结构转变、电导率变化、元素价态升降及其他性质的改变进行研究。进一步制备S_(0.95)SNC-Ag0/BaZr_(0.1)Ce_(0.7)Y_(0.2)O_(3-δ)(BZCY)/S_(0.95)SNC-Ag0对称电池,研究了S_(0.95)SNC-Ag0作为H^(+)-SOFC阴极的电化学性能,同时组装S_(0.95)SNC-Ag0/BZCY/NiO+BZCY单电池,测试单电池的性能输出。研究结果表明,原位脱溶产生的Ag0促进了阴极的氧吸附解离步骤;经原位脱溶处理后单电池在600℃下的最大功率密度由332提升至351 mW·cm^(-2)。With the aggravation of global warming trend,people have formed a consensus on the use of clean energy,and the de‐mand is increasingly urgent and vigorous.Solid oxide fuel cell (SOFC) is an efficient,environmentally friendly and mature technology to directly convert hydrogen energy into electric energy.Proton-conducting solid oxide fuel cells (H+-SOFCs) can operate at medium and low temperature (400~600℃),producing water at the cathode.Until now,H+-SOFC has two problems:(1) Poor stability limited by the lack of active sites for cathodic oxygen reduction reaction (ORR).(2) The catalytic activity of cathode material for ORR reac‐tion is insufficient.In this paper,Ag0.05Sr_(0.95)Sc_(0.175)Nb_(0.025)Co_(0.8)O_(3-δ)(S0.95SNC-Ag+) perovskite oxide was prepared by sol-gel method.The composite cathode of Sr_(0.95)Sc_(0.175)Nb_(0.025)Co_(0.8)O_(3-δ)loaded Ag^(0) (S0.95SNC-Ag^(0)) was obtained through in situ exsolution S0.95SNC-Ag+in 1% H2O-O2(volume fraction) atmosphere at 600℃.The solid electrolyte BaZr0.1Ce0.7Y0.2O3-δ(BZCY) was prepared using the same method.The transformation of crystal structure,the changes of electrical conductivity,element valence and other properties before and after in situ exsolution were investigated by X-ray diffraction (XRD),direct current four-terminal method and X-ray photoelectron spectroscopy (XPS).S0.95SNC-Ag^(0)/BZCY/S_(0.95)SNC-Ag^(0) symmetrical cell and S0.95SNC-Ag^(0)/BZCY/NiO+BZCY single cell were fabricated and their electrochemical properties were investigated.The symmetrical cell was passed through 1% H_(2)O-O_(2) atmosphere for 16 h to ex‐plore the effect of in situ exsolution on the polarization process of S_(0.95)SNC-Ag^(0) cathode.The current density of 625 mW·cm-2was main‐tained at both ends of the single cell for 16 h for in-situ exsolution occurred in the cathode,and the variation of working voltage of the single cell was tested.Then current-voltage (I-V) curve of the single cell was tested again.The cross section of single cell and energy dispersive X-ray

关 键 词：固体氧化物燃料电池(SOFC) 原位脱溶 质子导体 氧还原反应(ORR) 

分 类 号：TK91[动力工程及工程热物理]