纳米材料基催化剂
甲醇
电催化剂
单层
材料科学
金属间化合物
催化作用
化学工程
电解质
合金
无机化学
纳米技术
化学
电化学
冶金
物理化学
纳米颗粒
电极
有机化学
工程类
作者
Wen Chen,Shuiping Luo,Mingzi Sun,Min Tang,Xiaokun Fan,Yu Cheng,Xiaoyu Wu,Yujia Liao,Bolong Huang,Zewei Quan
出处
期刊:Small
[Wiley]
日期:2022-02-24
卷期号:18 (14)
被引量:19
标识
DOI:10.1002/smll.202107803
摘要
Engineering multicomponent nanocatalysts is effective to improve electrocatalysis in many applications, yet it remains a challenge in constructing well-defined multimetallic active sites at the atomic level. Herein, the surface inlay of sub-monolayer Pb oxyhydroxide onto hexagonal PtBi intermetallic nanoplates with intrinsically isolated Pt atoms to boost the methanol oxidation reaction (MOR) is reported. The well-defined PtBi@6.7%Pb nanocatalyst exhibits 4.0 and 7.4 times higher mass activity than PtBi nanoplates and commercial Pt/C catalyst toward MOR in the alkaline electrolyte at 30 °C. Meanwhile, it also achieves a record-high mass activity of 51.07 A mg-1Pt at direct methanol fuel cells operation temperature of 60 °C. DFT calculations reveal that the introduction of Pb oxyhydroxide on the surface not only promotes the electron transfer efficiency but also suppresses the CO poisoning effect, and the efficient p-d coupling optimizes the electroactivity of PtBi@6.7%Pb nanoplates toward the MOR process with low reaction barriers. This work offers a nanoengineering strategy to effectively construct and modulate multimetallic nanocatalysts to improve the electroactivity toward the MOR in future research.
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