双金属片
纳米材料基催化剂
纳米线
材料科学
酒精氧化
化学工程
纳米晶
电催化剂
晶体结构
纳米结构
甲醇
金属
催化作用
纳米技术
化学
结晶学
纳米颗粒
电化学
物理化学
有机化学
电极
冶金
工程类
作者
Zhen He,Qiaohui Duan,Lingwen Liao,Chengming Wang
标识
DOI:10.1016/j.cej.2023.143411
摘要
Metallic nanocrystals with abundant metastable twin boundaries have demonstrated great potential in prompting the improvement of electrocatalytic reactivity, such as alcohol oxidation reaction (AOR) in fuel cell applications. However, modulating the lattice and electronic structures of such twin-rich nanocatalysts to optimize the AOR activity remains a huge challenge. Herein, jagged Au-Pt bimetallic nanowires with abundant twin boundaries along the 〈1 1 1〉 direction have been constructed via a seeded synthesis method. Importantly, the lattice strain and electronic structures of Pt in the twin-rich nanowires have been feasibly tuned, resulting in the regulation of AOR performances. Impressively, the jagged AuPt3 nanowires, with an atomic ratio of ∼1:3, exhibit the highest mass activity toward ethanol oxidation reaction (EOR) and methanol oxidation reaction (MOR), outperforming AuPt9, AuPt, Pt nanowires and commercial Pt/C catalysts. The structure–activity correlation for the AOR follows a volcano-shaped curve with the increase of Pt ratios. Theoretical results suggest the weakened bonding of Pt-CO and strengthened Pt-OH on the AuPt3 (1 1 1)-twin site. Our work develops a simple yet effective method to synthesize twin-rich bimetallic nanostructures with controlled lattice strain and illustrates their structure-dependent properties, opening the way to develop high-performance electrocatalysts for promising applications.
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