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    In situ manipulation of the active Au-TiO2 interface with atomic precision during CO oxidation

    Editor:-- Date:2021-02-09 Hits:26

    Wentao Yuan, Beien Zhu, Ke Fang, Xiao-Yan Li, Thomas W. Hansen†, Yang Ou,Hangsheng Yang, Jakob B. Wagner†, Yi Gao†, Yong Wang†, Ze Zhang [Science]

    The interface between metal catalyst and support plays a critical role in heterogeneous catalysis. An epitaxial interface is generally considered to be rigid, and tuning its intrinsic microstructure with atomic precision during catalytic reactions is challenging. Using aberration-corrected environmental transmission electron microscopy, we studied the interface between gold (Au) and a titanium dioxide (TiO2) support. Direct atomic-scale observations showed an unexpected dependence of the atomic structure of the Au-TiO2 interface with the epitaxial rotation of gold nanoparticles on a TiO2 surface during carbon monoxide (CO) oxidation. Taking advantage of the reversible and controllable rotation, we achieved in situ manipulation of the active Au-TiO2 interface by changing gas and temperature. This result suggests that real-time design of the catalytic interface in operating conditions may be possible.

    DOI: 10.1126/science.abe3558