Core@shell sub-ten-nanometer noble metal nanoparticles with a controllable thin Pt shell and their catalytic activity towards oxygen reduction

Core@shell sub-ten-nanometer noble metal nanoparticles with a controllable thin Pt shell and their catalytic activity towards oxygen reduction
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具有可控薄铂壳的核@壳亚十纳米贵金属纳米粒子及其对氧还原的催化活性

DOI:
10.1007/s12274-014-0664-z
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发表时间:
2014
期刊:
影响因子:
9.9
通讯作者:
Hesun Zhu
Hesun Zhu
中科院分区:
材料科学1区
文献类型:
--
作者:
N. Deogratias;Muwei Ji;Yong Zhang;Jiajia Liu;Jiatao Zhang*;Hesun Zhu

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摘要减少Pt负载,同时提高Pt基纳米结构材料的电催化活性和稳定性,是当前绿色能源技术的关键挑战。在此,我们报道了通过界面介导的电位移,由可控薄Pt壳组成的三金属(Au@Ag@Pt)和双金属(Ag@Pt)颗粒的可控合成。通过油-乙醇-水界面的中介作用,Ag原子向Pt的可控“由外向内”位移,使得单分散的亚十纳米Au@Ag上形成薄Pt壳和银纳米晶体。由于Pt原子的高暴露,合成的具有薄Pt壳层的纳米粒子对氧还原反应(ORR)表现出潜在的催化活性。
AbstractReducing Pt loading, while improving electrocatalytic activity and the stability of Pt-based nanostructured materials, is currently a key challenge in green energy technology. Herein, we report the controllable synthesis of tri-metallic (Au@Ag@Pt) and bimetallic (Ag@Pt) particles consisting of a controllable thin Pt shell, via interface-mediated galvanic displacement. Through oil-ethanol-H2O interface mediation, the controllable “out to in” displacement of Ag atoms to Pt enables the formation of a thin Pt shell on monodisperse sub-ten-nanometer Au@Ag and Ag nanocrystals. The synthesized nanoparticles with a thin Pt shell exhibited potential catalytic activity towards the oxygen reduction reaction (ORR) due to the high exposure of Pt atoms.
星形Ag-Pt双金属纳米颗粒:催化活性调节的有效平台
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