Effect of phosphinate and copper additions on the structure of Pt and Pt-Cu nanoparticles in a radiation- induced reduction method
Effect of phosphinate and copper additions on the structure of Pt and Pt-Cu nanoparticles in a radiation- induced reduction method
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辐射诱导还原法中次膦酸盐和铜的添加对 Pt 和 Pt-Cu 纳米颗粒结构的影响
DOI：
10.1007/s11051-014-2275-8
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
T. A.
中科院分区：
文献类型：
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作者：
Seino S.; Nakagawa;T.; Yamamoto;T. A.
采用辐射还原法研究了磷（PH2O2−）和铜（Cu2+）对Pt-Cu纳米颗粒结构的影响。在前驱体溶液中加入PH2O2−，由于Pt或Pt - cu晶体的尺寸变小和结晶度降低，导致其衍射强度降低。当Cu/Pt比为0.05 ~ 0.25时，衍射强度和晶粒尺寸（通过电镜测量）均最小，这是由于铜和磷通过负混合热稳定晶体和颗粒的作用所致。磷含量的增加表明PH2O2−被部分还原并进入Pt晶格。随着铜含量的增加，颗粒变大，磷含量降低。这些趋势也与Pt表面的电化学表面积和氧化还原行为相一致。辐射诱导还原法适用于制备均匀分布在碳载体上的Pt-Cu小颗粒，可用于热处理以提高氧还原性能。
The effects of phosphorus (PH2O2−) and copper (Cu2+) additions to the aqueous precursor solution on the structure of Pt–Cu nanoparticles were investigated for a radiation-induced reduction method. Addition of PH2O2−in the precursor solution reduced the diffraction intensity of Pt or Pt–Cu crystallites due to smaller size and/or lower crystallinity. Both the diffraction intensity and the particle size (measured by an electron microscope) were minimized when Cu/Pt ratio was 0.05–0.25, which was attributed to the effects of copper and phosphorus to stabilize crystallites and particles through the negative heat of mixing. The concomitant increase in phosphorus content suggested that PH2O2−is partly reduced and taken into the Pt lattice. Further increase of copper content caused larger particles and decrease in phosphorus content. These trends were also consistent with electrochemical surface area and oxidation/reduction behavior of Pt surface. The radiation-induced reduction method is suited to produce small Pt–Cu particles uniformly distributed on carbon support, which are potentially served for heat treatment for improved oxygen reduction performance.