Tb掺杂DyBaCo_(4)O_(7+δ)纳米粉体的制备及其氧吸附/脱附性能的研究  

Synthesis of rare earth Tb doped DyBaCo_(4)O_(7+δ)nanopowder and its oxygen adsorption/desorption properties

作　　者：王娇[1,2] 王菲菲 郝好山[1,2] 夏思怡 刘少辉[1,2] WANG Jiao;WANG Feifei;HAO Haoshan;XIA Siyi;LIU Shaohui(Henan Key Laboratory of Electronic Ceramic Materials and Application,College of Materials Engineering,Henan University of Engineering,Zhengzhou 451191,China;Henan International Joint Laboratory of Rare Earth Composite Materials,College of Materials Engineering,Henan University of Engineering,Zhengzhou 451191,China)

机构地区：[1]河南工程学院材料工程学院,河南省电子陶瓷材料与应用重点实验室,郑州451191 [2]河南工程学院材料工程学院,河南省稀土复合材料国际联合实验室,郑州451191

出　　处：《功能材料》2023年第1期1110-1114,共5页Journal of Functional Materials

基　　金：国家自然科学基金项目(51902088);河南省高校科技创新人才项目(21HASTIT014);河南省优秀青年基金项目(212300410031)。

摘　　要：利用溶胶凝胶工艺合成了稀土元素Tb掺杂DyBaCo_(4)O_(7+δ)纳米粉体,采用XRD、SEM、差热分析仪等设备研究了不同浓度Tb掺杂对DyBaCo_(4)O_(7+δ)纳米粉体形貌、晶体结构及氧吸附-脱附性能的影响,测试结果表明:在较低掺杂浓度下,Tb很好地进入了Dy_(1-x)Tb_(x)BaCo_(4)O_(7+δ)的晶格,稀土Tb掺杂的DyBaCo_(4)O_(7+δ)纳米粉体仍是六方密排晶体结构;Tb元素掺杂对DyBaCo_(4)O_(7+δ)粉体的形貌影响不大。从室温到1000℃,DyBaCo_(4)O_(7+δ)纳米粉体与Tb掺杂的DyBaCo_(4)O_(7+δ)纳米粉体均表现出两次氧吸附和脱附现象,与未掺杂的DyBaCo_(4)O_(7+δ)纳米粉体氧吸附性能相比,Tb掺杂的DyBaCo_(4)O_(7+δ)纳米粉体的氧吸附性能明显高于未掺杂DyBaCo_(4)O_(7+δ)氧吸附性能,DyBaCo_(4)O_(7+δ)的氧吸附的变化量为1.4%,而Dy 0.85 Tb 0.15 BaCo_(4)O_(7+δ)的氧吸附的变化量4.9%,同时研究了在N_(2)/O_(2)气体切换过程,DyBaCo_(4)O_(7+δ)纳米粉体与Tb掺杂的DyBaCo_(4)O_(7+δ)纳米粉体的氧吸附/脱附行为。DyBaCo_(4)O_(7+δ)氧吸附/脱附性能的改善可以归因为Tb元素掺杂改善了DyBaCo_(4)O_(7+δ)的间距变宽,提高了DyBaCo_(4)O_(7+δ)样品的储氧空间增加有关。Rare earth element Tb doped DyBaCo_(4)O_(7+δ)nano-powder was synthesized by sol-gel process.The effect of Tb doping with different concentration on the morphology,crystal structure and oxygen adsorption-desorption properties of DyBaCo_(4)O_(7+δ)nano-powder was studied.Dy 1-x Tb x BaCo_(4)O_(7+δ)nanopowder is still hexagonal close packed crystal structure at low Tb doping concentration.Tb doping has little effect on the morphology of Dy 1-x Tb x BaCo_(4)O_(7+δ)nanopowder.From room temperature to 1000℃,DyBaCo_(4)O_(7+δ)nanopowder and Dy_(1-x)Tb_(x)BaCo_(4)O_(7+δ)nanopowders showed two times of oxygen adsorption and desorption.Compared with the oxygen adsorption performance of DyBaCo_(4)O_(7+δ)nanopowder,the oxygen adsorption capacity of Tb doped DyBaCo 4O 7+δnanopowder is obviously higher than that of undoped DyBaCo_(4)O_(7+δ).The oxygen adsorption capacity of DyBaCo_(4)O_(7+δ)is 1.4%,while the oxygen adsorption capacity of Dy 1-x Tb x BaCo_(4)O_(7+δ)is 4.9%.DyBaCo_(4)O_(7+δ)nanopowders and Dy_(1-x)Tb_(x)BaCo_(4)O_(7+δ)nanopowders showed good oxygen adsorption/desorption behavior during N_(2)/O_(2)gas switching.The improvement of the oxygen adsorption/desorption performance of DyBaCo_(4)O_(7+δ)can be attributed to the improvement of the spacing of DyBaCo_(4)O_(7+δ)and the increase of the oxygen storage space of DyBaCo_(4)O_(7+δ).

关 键 词：DyBaCo_(4)O_(7+δ) 纳米粉体 稀土掺杂 氧吸附/脱附性能 

分 类 号：TB34[一般工业技术—材料科学与工程]