Abstract
The catalytic activity of palladium (Pd) nanostructures highly relies on their size and morphology, especially enclosed with high-index facets, which provide more active sites so as to enhance their catalytic performance comparing with their low-index facet counterparts. Herein, Pd concave nanocubes enclosed with {730} facets by a one-pot scalable liquid method, with various high-index facets are synthesized via tuning reduction kinetics. Due to their high-index facets, the Pd concave nanocubes exhibit much higher electrocatalytic activity and stability for methanol oxidation than the Pd nanocubes enclosed by {100} facets and commercial Pd/C. Furthermore, we scale up synthesis of Pd concave nanocubes by expanding the volume of all species to fifty times with high-yield production.
Highlights
The catalytic activity of palladium (Pd) nanostructures highly relies on their size and morphology, especially enclosed with high-index facets, which provide more active sites so as to enhance their catalytic performance comparing with their low-index facet counterparts
Pd concave nanocubes enclosed with {730} facets by a one-pot scalable liquid method, with various high-index facets are synthesized via tuning reduction kinetics
Zhang et al demonstrated a liquid approach, which reduced Na2PdCl4 by L-ascorbic acid (AA) and capped by cetyltrimethyl-ammonium bromide (CTAB) and cetyltrimethylammonium chloride (CTAC), towards preparation of Pd concave nanocubes enclosed by various high-index facets such as {730} and {310} facets[23]
Summary
For the synthesis of PdCNs with high-index facets controlled, reduction kinetics have an significant effect on manipulating nucleation and growth of nanocrystals[28] In this study, both AA and CTAB are critical factors for the morphology evolution of Pd nanostructures. The products come to being thermodynamic favor shape as Pd nanocubes and shorter average length of edge It has been perplexing researchers for years in the view of scale-up synthesis of noble metal nanostructures[25]. The PdCNs have plenty steps, corners and edge-sites triggering more active sites, which sustainably enhance higher catalytic performance and durability for methanol oxidation than Pd nanocubes and commercial Pd/C This facile approach provides a bright prospect for achieving large-scale preparation of noble metal nanostructures with their morphologies controlling simultaneously
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