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Heterovalent ions incorporated pyrochlore Sm2Zr2O7 ceramic for enhanced NO2 sensing
Journal of the European Ceramic Society ( IF 5.8 ) Pub Date : 2020-03-20 , DOI: 10.1016/j.jeurceramsoc.2020.03.042
Yong Zheng , Pei Duan , Zhiyu Li , Guohui Cai , Fulan Zhong , Yihong Xiao

The present work demonstrated the heterovalent ions incorporated pyrochlore Sm2Zr2O7 ceramic with high NO2 sensitivity through molecular insights into the bond of [BO6] unit and the sensing mechanism. An effective B-site strategy was developed to prepare a series of defective Sm2Zr1.95X0.05O7+δ (SZX, X= Mn2+, Ga3+, Sn4+, Nb5+, W6+) ceramics to create oxygen vacancies or interstitial oxygen induced which enhances the NO2 sensing performances. The structural analyses carried out by XRD, SEM, XPS, Raman and the NO2 adsorption on a cold surface of the sensor clarified the potential sensing mechanism. The electrochemical results clearly indicate that NO2 sensing properties are closely related to the valence of doped cations. The sensor of Sm2Zr2O7 with Nb5+ arranged at B sites indicates high sensitivity, quick response/recovery speed, excellent selectivity and stability compared with others, exhibiting great application prospects for the automotive equipment.



中文翻译:

掺入烧绿石Sm 2 Zr 2 O 7陶瓷的杂价离子可增强NO 2感测

通过对[BO 6 ]单元键的键合和传感机理的分子洞察,本研究证明了掺入具有高NO 2敏感性的烧绿石Sm 2 Zr 2 O 7陶瓷中的杂价离子。开发了一种有效的B站点策略来制备一系列有缺陷的Sm2Zr1.95X0.05O7 +δ(SZX,X = Mn 2 +,Ga 3+,Sn 4+,Nb 5+,W 6+)陶瓷以产生氧气产生的空位或间隙氧增强了NO 2的感应性能。通过XRD,SEM,XPS,拉曼和NO 2进行结构分析传感器冷表面上的吸附阐明了电位感应机制。电化学结果清楚地表明,NO 2感测特性与掺杂阳离子的化合价密切相关。Nb 5+排列在B位的Sm2Zr2O7传感器与其他传感器相比具有较高的灵敏度,快速的响应/恢复速度,优异的选择性和稳定性,在汽车设备中具有广阔的应用前景。

更新日期:2020-03-20
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