Synthesis of PtRu/Ru heterostructure for efficient methanol electrooxidation: The role of extra Ru
Abstract Platinum-ruthenium (PtRu) nanocubes and PtRu/Ru heterostructure via epitaxial growth were synthesized by varying the amount of Ru precursor. As model catalysts, the PtRu/Ru heterostructure demonstrated the highest catalytic performance in electrooxidation of methanol, which was possibly due to the more hydroxyl species produced from the extra Ru nanoparticles as well as enhanced adsorption of methanol of PtRu alloys in the PtRu/Ru heterostructure. The catalytic performance of the catalysts was closely related with the structure, which was well characterized by a series of methods. It was expected that the present work could provide a new insight for the synthesis of PtRu based nanocatalysts. Highlights PtRu nanocubes and PtRu/Ru heterostructure were synthesized by one-pot method. The growth of the extra of Ru possibly resulted from the epitaxial growth. PtRu/Ru heterostructure demonstrated a much better methanol electrooxidation performance. Graphical abstract Platinum-ruthenium nanocubes (PtRu NCs) and PtRu/Ru heterostructures were synthesized. The PtRu/Ru heterostructures demonstrated the highest catalytic performances in electrooxidation of methanol and CO. [DISPLAY OMISSION]
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