Colossal Ionic Conductivity in Interphase Strain-Engineered Nanocomposite Films

作者：Huo, Chuanrui; Xu, Kun; Ma, Liyang; Li, Tianyu; Li, Hao; Yang, Xiaoyan; Kuang, Xiaojun; Liu, Shi; Deng, Shiqing^*; Chen, Jun^*

来源：Journal of the American Chemical Society, 2023, 145(25): 13623-13631.

DOI：10.1021/jacs.3c01298

• THIN-FILMS
• OXIDE
• TEMPERATURE
• POLARIZATION
• SRZRO3
• ELECTROLYTES
• TRANSPORT
• GD

Owing to their wide application in oxide-based electrochemicaland energy devices, ion conductors have attracted considerable attention.However, the ionic conductivity of the developed systems is stilltoo low to satisfy the low-temperature application. In this study,by developing the emergent interphase strain engineering method, weachieve a colossal ionic conductivity in SrZrO3-xMgO nanocomposite films, which is over one order of magnitudehigher than that of the currently widely used yttria-stabilized zirconiabelow 673 K. Atomic-scale electron microscopy studies ascribe thissuperior ionic conductivity to the periodically well-aligned SrZrO3 and MgO nanopillars that feature coherent interfaces. Wherein,a tensile strain as large as +1.7% is introduced into SrZrO3, expanding the c-lattice and distorting the oxygenoctahedra to decrease the oxygen migration energy. Combining withtheoretical assessments, we clarify the strain-dependent oxygen migrationpath and energy and unravel the mechanisms for strain-tuned ionicconductivity. This study provides a new scope for the property improvementof wide-range ion conductors by strain engineering.

• 单位
  清华大学; 北京科技大学; 桂林理工大学