Wet chemical synthesis of intermetallic Pt3Zn nanocrystals via weak reduction reaction together with UPD process and their excellent electrocatalytic performances.
Wet chemical synthesis of intermetallic Pt3Zn nanocrystals via weak reduction reaction together with UPD process and their excellent electrocatalytic performances.
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DOI：
10.1039/c4nr00313f
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发表时间：
2014-05
期刊：
影响因子：
6.7
通讯作者：
Qiaoli Chen;Jiawei Zhang;Yanyan Jia;Zhiyuan Jiang;Zhaoxiong Xie;Lan-Sun Zheng
中科院分区：
文献类型：
--
作者：
Qiaoli Chen;Jiawei Zhang;Yanyan Jia;Zhiyuan Jiang;Zhaoxiong Xie;Lan-Sun Zheng
铂基合金纳米晶在许多重要的实际过程中具有很好的应用前景。然而，制备具有良好表面结构的铂基金属间化合物纳米晶仍然是一个巨大的挑战。本文以{hk 0}晶面的凹立方金属间化合物Pt 3 Zn纳米晶的合成为例，提出了一种新的金属间化合物合成策略，即在湿化学合成中，通过缓慢还原法还原贵金属前驱体，并通过欠电位沉积（UPD）法还原过渡金属离子。与固溶体Pt 3 Zn纳米晶和Pt/C相比，所制备的金属间化合物Pt 3 Zn纳米晶具有上级抗CO中毒能力和较高的甲醇和甲酸氧化电催化活性。
Platinum based alloy nanocrystals are promising catalysts for a variety of important practical process. However, it remains a great challenge to synthesize platinum-based intermetallic compound nanocrystals with well-defined surface structures. In this communication, taking the synthesis of concave cubic intermetallic Pt3Zn nanocrystals with {hk0} facets as an example, we proposed a new synthesis strategy for intermetallic compounds by reduction of noble metal precursors via a slow reduction process and reduction of transition metal ions via an underpotential deposition (UPD) process in wet chemical synthesis. The as-prepared intermetallic Pt3Zn nanocrystals exhibited superior CO poisoning tolerance and high electro-catalytic activity in both methanol and formic acid oxidation reactions in comparison with solid solution Pt3Zn nanocrystals and Pt/C.