Abstract
The ultrafine nanoporous CuO ribbons modified by Au nanoparticles are prepared through simply dealloying the melt-spun Al–Cu–Au alloys combined the subsequent calcination in air. A nanoporous Cu (Au) solid solution ribbon is constructed as the removal of Al from the precursory alloys. After calcined at high temperature, Cu is oxidized to CuO with a porous structure and the in situ generated Au nanoparticles embed in ligaments, resulting in the formation of nanoporous CuO/Au composites with a pore size about 25 nm. The experiment results indicate that the composites have large surface area, high activity and stability. And the CO conversion rate can reach 100.0% just at 180 °C. According to XPS (X-ray photoelectron spectroscopy) results, the superior performance at low temperature is ascribed to the presence of Au+1 species and the interfacial interaction between Au nanoparticles and CuO ligaments. The present work can contribute to the development of the porous catalytic materials with high performances and low cost.
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