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Based on a one-pot,rapid microwave-assisted method,water-soluble surface-aminated carbon nanotubes (CNTs-NH2) was directly synthesized from pristine CNTs by covalently grafting ethylenediamine onto the surface of CNTs,requiring no cumbersome chemical oxidation of CNTs.Due to their excellent water-solubility,abundant surface functional groups and the excellent proton conductivity,the platinum-ruthenium nanoparticles (PtRu NPs) were highly dispersed on the CNTs and the obtained PtRu NPs/CNTs-NH2 nanohybrids show superb performance for methanol electrooxidation.