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.

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。