超细PtCu纳米线的表面结构调控及其增强的醇类 电催化氧化作用

Abstract

Surface tailoring of Pt-based nanocatalysts is an effective pathway to promote their electrocatalytic performance and multifunctionality. Here, we report two kinds of one-dimensional (1D) ultrafine PtCu nanowires (smooth surface & rugged surface) synthesized via a wet chemical method and their distinct catalytic performances in electrooxidation of alcohols. The alloyed PtCu nanowires having rough surfaces with atomic steps exhibit superior catalytic activity toward multiple electrochemical reactions compared with the smooth counterpart. Density functional theory simulations show the excellent reactivity of rugged PtCu nanowires and attribute it to the surface synergetic Pt-Cu site which accounts for the promotion of water dissociation and the dehydrogenation of the carboxyl intermediate. The current study provides an insight into reasonable design of alloy nanocatalysts in energy-related electrocatalytic systems.

Noble Metal‐Based Multimetallic Nanoparticles for Electrocatalytic Applications

“…Among the shape‐controlled nanocatalysts, multimetallic nanoparticles with high‐index facets (HIFs) have attracted much attention owing to their low‐coordinated surface atoms that exhibit enhanced activity for several electrocatalysis. [ 47 , 48 ] However, the instability of the facets makes it difficult for the facets to survive under reaction conditions. While extensive progress has been made in the fabrication and systematic studies on monometallic systems with HIF, there are very few studies for multimetallic systems, owing to the higher complexity compared to monometallic systems.…”

The catalytic activity of PtnCum (n+m=3, m≠3) clusters for methanol dehydrogenation to CO

“…At present, PtCu binary metal catalyst has attracted great attention of scientists due to its good oxidation activity, stability and anti-poisoning performance for methanol of direct methanol fuel cells (DMFCs), and many research groups have achieved excellent results [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Chen et al [10] have found that hollow PtCu octahedral nanoalloys are e cient bifunctional electrocatalysts towards oxygen reduction reaction and methanol oxidation reaction by regulating near-surface composition.…”

Pt Atomic Layers with Tensile Strain and Rich Defects Boost Ethanol Electrooxidation

“…Numerous efforts have been made to demonstrate that Pt-based catalysts are promising candidates for ethanol electrooxidation. − However, their catalytic activity and stability urgently need to be improved for enabling commercial deployment of DEFCs. To improve catalytic efficiency, one effective approach is to conduct surface engineering to increase the number of active sites, − through dispersing Pt atoms on the catalyst surface to form Pt-skin layers, − or constructing defect-rich surface to fully expose Pt active sites. − Another strategy is to enhance the intrinsic reactivity of each active site, − which can be achieved by control over the strain effect of catalyst surface via strain engineering. − However, Pt-skin layers and defect-rich surface over alloy nanoparticles are usually destroyed during long-term catalytic operation due to structural rearrangement induced by the segregation and dealloying process, resulting in the decrease of activity and poor durability. − Intermetallic compounds with atomically ordered arrangements and well-defined stoichiometry possess excellent structural stability. − Therefore, rational design of Pt-based intermetallic compounds via surface engineering and strain engineering is expected to enhance electrocatalytic activity while maintaining superior durability; however, it still remains a grand challenge.…”