Morphology and Phase Controlled Construction of Pt-Ni Nanostructures for Efficient Electrocatalysis
Morphology and Phase Controlled Construction of Pt-Ni Nanostructures for Efficient Electrocatalysis
复制标题
用于高效电催化的 Pt-Ni 纳米结构的形态和相控构建
DOI：
10.1021/acs.nanolett.6b00471
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发表时间：
2016-04-01
期刊：
影响因子：
10.8
通讯作者：
Huang, Xiaoqing
中科院分区：
文献类型：
--
作者：
Ding, Jiabao;Bu, Lingzheng;Huang, Xiaoqing
高度开放的金属纳米框架因其奇特的轮廓和较大的可获得表面积而成为一类新兴的先进催化应用的新型纳米结构。然而，到目前为止，创造具有可调结构的双金属纳米框架仍然是一个挑战。在这里，我们开发了一种简单而有效的化学方法，可以制备出形状可控、产率高的高成分分离的铂镍纳米晶。选择使用十二烷基三甲基氯化铵(DTAC)和控制油胺(OM)/油酸(OA)的比例是可控地制备高成分分离的铂镍纳米晶的关键。当DTAC促进成分各向异性生长时，OM/OA值控制得到的高成分偏析的铂镍纳米晶的形状。据我们所知，这是首次报道成分偏析的四面体铂镍纳米碳管。重要的是，通过简单地用冰醋酸处理高成分分离的铂-镍纳米晶过夜，这些固体铂-镍纳米晶很容易转变为高度开放的铂-镍纳米晶而几乎不改变形状和尺寸。所得的高度开放的铂-镍纳米框架是氧还原反应和醇氧化反应的高性能电催化剂，远远好于商用的铂/碳催化剂。我们的结果表明，可以通过改变纳米晶体的结构/组成来开发增强型催化剂。
Highly open metallic nanoframes represent an emerging class of new nanostructures for advanced catalytic applications due to their fancy outline and largely increased accessible surface area. However, to date, the creation of bimetallic nanoframes with tunable structure remains a challenge. Herein, we develop a simple yet efficient chemical method that allows the preparation of highly composition segregated Pt-Ni nanocrystals with controllable shape and high yield. The selective use of dodecyltrimethylammonium chloride (DTAC) and control of oleylamine (OM)/oleic acid (OA) ratio are critical to the controllable creation of highly composition segregated Pt-Ni nano crystals. While DTAC mediates the compositional anisotropic growth, the OM/OA ratio controls the shapes of the obtained highly composition segregated Pt-Ni nanocrystals. To the best of our knowledge, this is the first report on composition segregated tetrahexahedral Pt-Ni NCs. Importantly, by simply treating the highly composition segregated Pt-Ni nanocrystals with acetic acid overnight, those solid Pt-Ni nanocrystals can be readily transformed into highly open Pt-Ni nanoframes with hardly changed shape and size. The resulting highly open Pt-Ni nanoframes are high-performance electrocatalysts for both oxygen reduction reaction and alcohol oxidations, which are far better than those of commercial Pt/C catalyst. Our results reported herein suggest that enhanced catalysts can be developed by engineering the structure/composition of the nanocrystals.