Highly branched Pt-Ni nanocrystals enclosed by stepped surface for methanol oxidation
Highly branched Pt-Ni nanocrystals enclosed by stepped surface for methanol oxidation
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DOI：
10.1039/c2sc00004k
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发表时间：
2012-01-01
期刊：
影响因子：
8.4
通讯作者：
Li, Yadong
中科院分区：
文献类型：
--
作者：
Niu, Zhiqiang;Wang, Dingsheng;Li, Yadong
具有优先表面原子排列、组成和整体形态的纳米催化剂的集成设计将为增强其催化活性和耐久性提供很大的机会。本文采用种子扩散法制备了具有分枝形貌和台阶表面的Pt-Ni纳米束。对于甲醇氧化，Pt-Ni NBs具有常规Pt纳米颗粒（NP）的3.6倍活性，这可能是由于高密度表面原子台阶和表面Ni物种的存在。由于具有抗聚集的星形形态，Pt-Ni NPs在4000次循环后具有55%的初始峰值电流密度，而常规Pt NPs仅保持10%。
Integrated design of nanocatalysts with a preferential surface atomic arrangement, composition, and overall morphology will provide great opportunities to enhance their catalytic activity and durability. In this work, Pt-Ni bimetallic nanobundles (NBs) with branched morphology and stepped surfaces have been prepared by a seed-based diffusion method. For methanol oxidation, the Pt-Ni NBs possess 3.6-fold the activity of conventional Pt nanoparticles (NPs), likely due to the high-density surface atomic steps and the presence of surface Ni species. With the aggregation resistant starlike morphology, the Pt-Ni NBs pertain 55% of initial peak current density after 4000 cycles, while conventional Pt NPs maintain only 10% of that.