Facile synthesis of Pd–Pt alloy concave nanocubes with high-index facets as electrocatalysts for methanol oxidation
Literature Information
Fangwei Zhan, Ting Bian, Wengao Zhao, Hui Zhang, Mingshang Jin, Deren Yang
Pd–Pt alloy concave nanocubes enclosed by high-index facets were synthesized in ethylene glycol (EG) containing H2PtCl6 and Na2PdCl4 with ascorbic acid (AA) and KBr as reducing and capping agents, respectively. We found that the combination of bromide-induced galvanic replacement and co-reduction was responsible for the formation of these alloy concave nanocubes. The composition of the Pd–Pt alloy concave nanocubes was also tuned by varying the molar ratio of Pd to Pt salt precursors fed in the reaction. In addition, the variation in composition had a great impact on the rate of galvanic replacement, and thus the concave content of such alloy nanocrystals. These Pd–Pt alloy concave nanocubes showed composition-dependent catalytic activity for methanol oxidation, with Pd40Pt60-based catalysts exhibiting the highest activity. Compared to the commercial Pt/C, the Pd40Pt60 alloy concave nanocubes showed much improved tolerance toward CO poisoning, together with 4.6 times enhancement in specific activity for methanol oxidation due to possible synergetic effects between Pd and Pt and the unique surface structure associated with high-index facets.
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CrystEngComm

CrystEngComm is the forum for the design and understanding of crystalline materials. We welcome studies on the investigation of molecular behaviour within crystals, control of nucleation and crystal growth, engineering of crystal structures, and construction of crystalline materials with tuneable properties and functions. We publish hypothesis-driven research into… how crystal design affects thermodynamics, phase transitional behaviours, polymorphism, morphology control, solid state reactivity (crystal-crystal solution-crystal, and gas-crystal reactions), optoelectronics, ferroelectric materials, non-linear optics, molecular and bulk magnetism, conductivity and quantum computing, catalysis, absorption and desorption, and mechanical properties. Using Techniques and methods including… Single crystal and powder X-ray, electron, and neutron diffraction, solid-state spectroscopy, spectrometry, and microscopy, modelling and data mining, and empirical, semi-empirical and ab-initio theoretical evaluations. On crystalline and solid-state materials. We particularly welcome work on MOFs, coordination polymers, nanocrystals, host-guest and multi-component molecular materials. We also accept work on peptides and liquid crystals. All papers should involve the use or development of a design or optimisation strategy. Routine structural reports or crystal morphology descriptions, even when combined with an analysis of properties or potential applications, are generally considered to be outside the scope of the journal and are unlikely to be accepted.










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