Pd‐Ru Alloy Nanocages with a Face‐Centered Cubic Structure and Their Enhanced Activity toward the Oxidation of Ethylene Glycol and Glycerol,Small Methods

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Pd‐Ru Alloy Nanocages with a Face‐Centered Cubic Structure and Their Enhanced Activity toward the Oxidation of Ethylene Glycol and Glycerol
Small Methods ( IF 10.7 ) Pub Date : 2020-01-29 , DOI: 10.1002/smtd.201900843
Ming Zhao ₁ , Zhiheng Lyu ₁ , Minghao Xie ₁ , Zachary D. Hood _{1,

2} , Zhenming Cao ₃ , Miaofang Chi ₂ , Younan Xia _{1,

3}

Affiliation

This article reports a facile method for the synthesis of Pd‐Ru nanocages by activating the galvanic replacement reaction between Pd nanocrystals and a Ru(III) precursor with I‐ ions. The as‐synthesized nanocages feature a hollow interior, ultrathin wall of ≈2.5 nm in thickness, and a cubic shape. Our quantitative study suggests that the reduction rate of the Ru(III) precursor can be substantially accelerated upon the introduction of I‐ ions and then retarded as the ratio of I‐/Ru³⁺ is increased. The Pd‐Ru nanocages take an alloy structure, with the Ru atoms in the nanocages crystallized in a face‐centered cubic structure instead of the hexagonal close‐packed phase taken by bulk Ru. Using Pd nanocubes with different edge lengths, the dimensions of the nanocages in the range of 6−18 nm can readily be tuned. When tested as catalysts toward the electro‐oxidation of ethylene glycol and glycerol, respectively, the Pd‐Ru cubic nanocages prepared from 18 nm Pd cubes exhibit 5.1‐ and 6.2‐fold enhancements in terms of mass activity relative to the commercial Pd/C. After 1000 cycles of accelerated durability test, the mass activities of the nanocages are still 3.3 and 3.7 times as high as that of the pristine commercial Pd/C catalyst, respectively.

中文翻译：

具有面心立方结构的Pd-Ru合金纳米笼及其对乙二醇和甘油氧化的增强活性

本文通过激活的Pd纳米晶体和具有I由Ru（III）前体之间的电偶置换反应报道了钯-钌纳米笼的合成的简便方法-离子。合成后的纳米笼具有空心的内部结构，厚约2.5nm的超薄壁和立方体形状。我们的定量研究表明，降低率在Ru（III）前体可以基本上在所述引入我加速-离子，然后作为延迟I的比率- /茹³⁺增加。Pd-Ru纳米笼具有合金结构，纳米笼中的Ru原子以面心立方结构结晶，而不是块状Ru占据的六方密堆积相。使用具有不同边缘长度的Pd纳米立方体，可以很容易地调节6-18 nm范围内的纳米笼的尺寸。当分别测试乙二醇和甘油的电氧化催化剂时，由18 nm Pd立方体制备的Pd-Ru立方纳米笼相对于商业Pd / C而言，其质量活性提高了5.1倍和6.2倍。经过1000个循环的加速耐久性测试后，纳米笼的质量活性仍然分别是原始商品化Pd / C催化剂的3.3倍和3.7倍。

更新日期：2020-01-29

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