Oxygen-diffusion-driven oxidation behavior and tracking areas visualized by X-ray spectro-ptychography with unsupervised learning

• DOI: 10.1038/s42004-019-0147-y
• Publication Date: 2019-04-26T10:03:17Z
• Authors: Makoto Hirose; Nozomu Ishiguro; Kei Shimomura; Duong-Nguyen Nguyen; Hirosuke Matsui; Hieu Chi Dam; Mizuki Tada; Yukio Takahashi
• Keywords: Oxygen storage; Cerium oxide

Abstract Oxygen storage and release with oxygen diffusion in the bulk of cerium–zirconium solid solution oxide Ce 2 Zr O x ( = 7–8), which possesses an atomically ordered arrangement cerium zirconium atoms, is key to three-way exhaust catalysis. proceeds via heterogeneous into vacant sites 7 particles, but track erased after bulk. Here we show three-dimensional hard X-ray spectro-ptychography clearly visualize valence map unsupervised learning reveals concealed oxygen-diffusion-driven nanoscale oxidation behavior tracking areas inside individual mixed-oxide particles during process. The described approach may permit chemical imaging reaction materials.