Bimetallic nanocatalysts based on platinum-group metals (PGMs) are of central importance in industrial catalysis and green-energy technologies, such as fuel cells. [1,2] Great efforts have been dedicated toward the construction of functional Pt and Pd nanostructures with designed shape and geometry in order to achieve higher catalytic activity and better precious-metal
utilization. [3,4] Meanwhile, the addition of a second metal, such as Ru and Au, can often greatly improve the overall catalytic properties due to structure-induced promotional effects. [5–7]
These nanostructures, typically in a form of alloys, core/shell structures, and heteroaggregates, [5–8] are commonly fabricated by surfactant-assisted wet-chemical processes with the excessive use of organic chemicals at relatively high temperatures, and great care should be taken in order to obtain a desired structural dispersion. [9] Ideally, one would prefer a convenient and environmentally benign approach to synthesize bimetallic nanostructures in large scale under mild conditions in the absence of any organic reagents. Here, we report a general approach to nanotubular mesoporous (NM) bimetallic nanocatalysts (Pt/Cu and Pd/Cu) based on a simple combination of room-temperature dealloying and galvanic-replacement reaction, which show obviously enhanced electrocatalytic properties.
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