Atomic-Level Pd-Pt Alloying and Largely Enhanced Hydrogen-Storage Capacity in Bimetallic Nanoparticles Reconstructed from Core/Shell Structure by a Process of Hydrogen Absorption/Desorption
Atomic-Level Pd-Pt Alloying and Largely Enhanced Hydrogen-Storage Capacity in Bimetallic Nanoparticles Reconstructed from Core/Shell Structure by a Process of Hydrogen Absorption/Desorption
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DOI：
10.1021/ja1013163
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发表时间：
2010-04-28
影响因子：
15
通讯作者：
Takata, Masaki
中科院分区：
文献类型：
--
作者：
Kobayashi, Hirokazu;Yamauchi, Miho;Takata, Masaki
我们通过氢吸收/解吸过程作为核 (Pd)/壳 (Pt) 纳米颗粒的触发因素，实现了 Pd 和 Pt 在原子水平上均匀混合的固溶体合金的创建。从核/壳到固溶体的结构变化已通过原位粉末X射线衍射、能量色散谱、固态H-2 NMR测量和氢压力-组成等温线证实。成功获得的Pd-Pt固溶体纳米粒子，其Pt含量为8-21原子％，比Pd纳米粒子具有更高的储氢能力。此外，Pd-Pt固溶体纳米粒子的储氢能力可以通过改变Pd和Pt的组成来调节。
We have achieved the creation of a solid-solution alloy where Pd and Pt are homogeneously mixed at the atomic level, by a process of hydrogen absorption/desorption as a trigger for core (Pd)/shell (Pt) nanoparticles. The structural change from core/shell to solid solution has been confirmed by in situ powder X-ray diffraction, energy dispersive spectra, solid-state H-2 NMR measurement, and hydrogen pressure-composition isotherms. The successfully obtained Pd-Pt solid-solution nanoparticles with a Pt content of 8-21 atom % had a higher hydrogen-storage capacity than Pd nanoparticles. Moreover, the hydrogen-storage capacity of Pd-Pt solid-solution nanoparticles can be tuned by changing the composition of Pd and Pt.