title: Octahedral Pd@Pt1.8Ni core-shell nanocrystals with ultrathin PtNi alloy shells as active catalysts for oxygen reduction reaction.
abstract: Forming core-shell and alloy structures offers generally two ways to design efficient Pt-based catalysts for oxygen reduction reaction (ORR). Here, we combined these two strategies and invented a versatile aqueous route to synthesize octahedral Pd@Pt1.8Ni core-shell nanocrystals. The Pt/Ni atomic ratios in the resultant shells can be varied from 0.6 to 1.8, simply by changing the amounts of Pt and Ni precursors, with the other conditions unchanged. Experimental studies showed that the mass activities of as-prepared catalysts were 5 times higher than that of the commercial Pt/C. We believe that the ultrathin PtNi shells enclosed by {111} facets made it possible to reduce the Pt content while retaining the catalytic activity toward ORR. This strategy may be extended to the preparation of other multimetallic nanocrystals with shaped and ultrathin alloy shells, which is conducive to design highly active catalysts.
authors: Hefei National Laboratory for Physical Sciences at the Microscale & Synergetic Innovation Center of Quantum Information and Quantum Physics, Center of Advanced Nanocatalysis, and Department of Chemical Physics, University of Science and Technology of China , Hefei, Anhui 230026, P. R. China.
authors: Xu
authors: X
authors: Zhao
authors: Sheng
authors: S
authors: Chen
authors: Zhicheng
authors: Z
authors: Fang
authors: Jia
authors: J
authors: Ding
authors: Wei
authors: W
authors: Sang
authors: Youcheng
authors: Y
authors: Wang
authors: Jin
authors: J
authors: Zhao
authors: Zhenmeng
authors: Z
authors: Peng
authors: Jie
authors: J
authors: Zeng
mesh_terms: D000497:Alloys / Q000737:chemistry*; D002384:Catalysis; D004563:Electrochemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry; D010316:Particle Size; D010984:Platinum / Q000737:chemistry
chemical_list: D000497:Alloys; D010984:Platinum; D010165:Palladium; D009532:Nickel; D010100:Oxygen