Structure of Pt(111)/Ionomer Membrane Interface and Its Bias-Induced Change in Membrane Electrode Assembly
Structure of Pt(111)/Ionomer Membrane Interface and Its Bias-Induced Change in Membrane Electrode Assembly
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Pt(111)/离聚物膜界面结构及其偏压引起的膜电极组装变化
DOI：
10.1021/jp402251z
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
and K. Uosaki
中科院分区：
文献类型：
--
作者：
T. Masuda;H. Fukumitsu;T. Kondo;H. Naohara;K. Tamura;O. Sakata;and K. Uosaki
采用表面X射线散射法在原子水平上研究了聚合物电解质膜（PEM）燃料电池膜电极组件（MEA）结构中的全氟磺化离聚物（PFSI）/Pt（111）界面结构，即真空蒸发Pt层/PEM（Nafionmembrane）/PFSI（adhesionNafionlayer）/Pt（111）单晶，以及偏压引起的界面结构变化。晶体截断棒测量表明，PFSI吸附在Pt（111）-（1 × 1）表面，没有偏压.当Pt（111）电极被正偏置以形成Pt氧化物时，PFSI层从Pt表面脱离并且氧原子渗透到Pt晶格中。
The structure of the perfluorosulfonated ionomer (PFSI)/Pt(111) interface in a membrane electrode assembly (MEA)-like configuration of a polymer electrolyte membrane (PEM) fuel cell, that is, a vacuum evaporated Pt layer/PEM(Nafion membrane)/PFSI(adhesion Nafion layer)/Pt(111) single crystal, and its bias-induced change were investigated by surface X-ray scattering measurement at an atomic level. Crystal truncation rod measurement shows that PFSI adsorbed on the Pt(111)-(1 × 1) surface without bias. When the Pt(111) electrode was positively biased to form Pt oxide, the PFSI layer was detached from the Pt surface and oxygen atoms penetrated into the Pt lattice.