CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, People's Republic of China.
University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China.
Nano Lett. 2017 Jun 14;17(6):3518-3526. doi: 10.1021/acs.nanolett.7b00603. Epub 2017 May 11.
The direct lattice strain, either distortion, compressive, or tensile, can efficiently alter the intrinsic electrocatalytic property of the catalysts. In this work, we report a novel and effective strategy to distort the lattice structure by constructing a metastable MoSSe solid solution and thus, tune its catalytic activity for the Li-O batteries. The lattice distortion structure with inequivalent interplanar spacing between the same crystals plane were directly observed in individual MoSSe nanosheets with transmission electron microscopy and aberration-corrected transmission electron microscopy. In addition, in situ transmission electron microscopy analysis revealed the fast Li diffusion across the whole metastable structure. As expected, when evaluated as oxygen electrode for deep-cycle Li-O batteries, the metastable MoSSe solid solution deliver a high specific capacity of ∼730 mA h g with stable discharge-charge overpotentials (0.17/0.49 V) over 30 cycles.
晶格应变，无论是扭曲、压缩还是拉伸，都能有效地改变催化剂的本征电催化性能。在这项工作中，我们报告了一种通过构建亚稳 MoSSe 固溶体来扭曲晶格结构的新颖而有效的策略，从而调节其对 Li-O 电池的催化活性。在单个 MoSSe 纳米片中，通过透射电子显微镜和像差校正的透射电子显微镜直接观察到具有相同晶体平面之间不等的层间间距的晶格扭曲结构。此外，原位透射电子显微镜分析表明，Li 可以快速扩散穿过整个亚稳结构。不出所料，当将其作为深循环 Li-O 电池的氧电极进行评估时，亚稳 MoSSe 固溶体在 30 个循环中提供了高达 730 mA h g-1的高比容量，稳定的放电-充电过电位（0.17/0.49 V）。
