Proper alloying of Pt with underlying Ag nanoparticles leads to dramatic activity enhancement of Pt electrocatalyst

Proper alloying of Pt with underlying Ag nanoparticles leads to dramatic activity enhancement of Pt electrocatalyst
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Pt 与下面的 Ag 纳米颗粒的适当合金化可显着增强 Pt 电催化剂的活性

DOI:
10.1016/j.elecom.2008.04.010
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发表时间:
2008-06
影响因子:
5.4
通讯作者:
--
中科院分区:
工程技术3区
文献类型:
--
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通过柠檬酸盐还原PtIVCl 62-或PtIICl 42-离子沉积Pt,制备了在Ag胶体上含有Pt-氟的纳米结构(Pt^Ag)。由PtIVCl_(62-)制备的纳米结构由于PtIVCl_(62-)和金属Ag胶体之间的电置换反应而表现出或多或少的Pt-Ag合金化。在制备过程中,通过调节Pt/Ag原子比(m)来控制Ag胶体表面的Pt-Ag合金化。结果表明,在较窄的组成窗口(0.47 μ m × 0.53)内,适当的Pt-Ag合金化可使Pt的甲醇电氧化活性提高一个数量级.
Nanostructures containing Pt-flecks on Ag colloids (Pt^Ag) were prepared by Pt deposition from citrate reduction of PtIVCl62-or PtIICl42-ions. The nanostructures prepared from PtIVCl62-showed more or less Pt–Ag alloying due to the galvanic replacement reaction between PtIVCl62-and metallic Ag colloids. The Pt–Ag alloying at the surface of Ag colloids was manipulated by tuning the atomic Pt/Ag ratio (m) during preparation. It was demonstrated that a proper Pt–Ag alloying in a narrow composition window (0.47⩽m⩾0.53) can led to a dramatic activity enhancement of Pt, up to one order of magnitude higher, for methanol electro-oxidation.
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