Strain engineering to enhance the electrooxidation performance of atomic-layer Pt on intermetallic Pt3Ga,Journal of the American Chemical Society

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Strain engineering to enhance the electrooxidation performance of atomic-layer Pt on intermetallic Pt3Ga
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2018-02-16 , DOI: 10.1021/jacs.7b13612
Quanchen Feng ₁ , Shu Zhao ₂ , Dongsheng He ₃ , Shubo Tian ₁ , Lin Gu ₄ , Xiaodong Wen ₅ , Chen Chen ₁ , Qing Peng ₁ , Dingsheng Wang ₁ , Yadong Li ₁

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Strain engineering has been a powerful strategy to finely tune the catalytic properties of materials. We report a tensile-strained two-to-three atomic-layer Pt on intermetallic Pt3Ga (AL-Pt/Pt3Ga) as an active electrocatalyst for the methanol oxidation reaction (MOR). Atomic-resolution high-angle annular dark-field scanning transmission electron microscopy characterization showed that the AL-Pt possessed a 3.2% tensile strain along the [001] direction while having a negligible strain along the [100]/[010] direction. For MOR, this tensile-strained AL-Pt electrocatalyst showed obviously higher specific activity (7.195 mA cm-2) and mass activity (1.094 mA/μgPt) than those of its unstrained counterpart and commercial Pt/C catalysts. Density functional theory calculations demonstrated that the tensile-strained surface was more energetically favorable for MOR than the unstrained one, and the stronger binding of OH* on stretched AL-Pt enabled the easier removal of CO*.

中文翻译：

提高金属间化合物 Pt3Ga 上原子层 Pt 电氧化性能的应变工程

应变工程一直是微调材料催化性能的强大策略。我们报告了金属间 Pt3Ga（AL-Pt/Pt3Ga）上的拉伸应变 2 到 3 个原子层 Pt 作为甲醇氧化反应（MOR）的活性电催化剂。原子分辨率高角度环形暗场扫描透射电子显微镜表征表明，AL-Pt 沿 [001] 方向具有 3.2% 的拉伸应变，而沿 [100]/[010] 方向的应变可以忽略不计。对于 MOR，这种拉伸应变的 AL-Pt 电催化剂显示出明显高于其未应变对应物和商业 Pt/C 催化剂的比活性 (7.195 mA cm-2) 和质量活性 (1.094 mA/μgPt)。

更新日期：2018-02-16

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