催化作用
镓
扫描隧道显微镜
X射线光电子能谱
过渡金属
氧化物
材料科学
金属
甲醇
化学工程
无机化学
纳米技术
化学
冶金
有机化学
工程类
作者
Si Woo Lee,Mauricio López Luna,Nikolay Berdunov,Weiming Wan,Sebastian Kunze,Shamil Shaikhutdinov,Beatriz Roldán Cuenya
标识
DOI:10.1038/s41467-023-40361-3
摘要
Gallium-containing alloys have recently been reported to hydrogenate CO2 to methanol at ambient pressures. However, a full understanding of the Ga-promoted catalysts is still missing due to the lack of information about the surface structures formed under reaction conditions. Here, we employed near ambient pressure scanning tunneling microscopy and x-ray photoelectron spectroscopy to monitor the evolution of well-defined Cu-Ga surfaces during CO2 hydrogenation. We show the formation of two-dimensional Ga(III) oxide islands embedded into the Cu surface in the reaction atmosphere. The islands are a few atomic layers in thickness and considerably differ from bulk Ga2O3 polymorphs. Such a complex structure, which could not be determined with conventional characterization methods on powder catalysts, should be used for elucidating the reaction mechanism on the Ga-promoted metal catalysts.
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