Analysis of the Surface Oxidation Process on Pt Nanoparticles on a Glassy Carbon Electrode by Angle -Resolved, Grazing-Incidence X-ray Photoelectron Spectroscopy

被引：4
|
作者：
Miyashita, Shota [1 ]
Wakisaka, Mitsuru [2 ,4 ]
Iiyarna, Akihiro [2 ]
Uchida, Hiroyuki [2 ,3 ]
机构：
[1] Univ Yamanashi, Interdisciplinary Grad Sch Med Engn & Agr Sci, Special Doctoral Program Green Energy Convers Sci, 4 Takeda, Kofu, Yamanashi 4008510, Japan
[2] Univ Yamanashi, Fuel Cell Nanomat Ctr, 4 Takeda, Kofu, Yamanashi 4008510, Japan
[3] Univ Yamanashi, Clean Energy Res Ctr, 4 Takeda, Kofu, Yamanashi 4008510, Japan
[4] Toyama Prefectural Univ, Grad Sch Engn, 5180 Kurokawa, Imizu, Toyama 9390398, Japan
来源：
LANGMUIR | 2017年 / 33卷 / 36期
关键词：
OXYGEN REDUCTION REACTION; FUEL-CELL CATHODE; IN-SITU; PLATINUM NANOPARTICLES; OXIDE-GROWTH; ELECTROCHEMICAL OXIDATION; DURABILITY; CATALYSTS; PT/C; MECHANISM;
D O I：
10.1021/acs.langmuir.7b01446
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
We have analyzed the surface oxidation process of Pt nanoparticles that were uniformly dispersed on a glassy carbon electrode (Pt/GC), which was adopted as a model of a practical Pt/C catalyst for fuel cells, in NZ purged 0.1 M HF solution by using angle-resolved, grazing-incidence X-ray photoelectron spectroscopy combined with an electrochemical cell (EC-ARG1XPS). Positive shifts in the binding energies of Pt 4f spectra were clearly observed for the surface oxidation of Pt nanoparticles at potentials E > 0.7 V vs RHE, followed by a bulk oxidation of Pt to form Pt(II) at E > 1.1 V. Three types of oxygen species (H2Oad, OHad, and O-ad) were identified in the 0 Is spectra. It was found for the first time that the surface oxidation process of the Pt/GC electrode at E < ca. 0.8 V (OHad formation) is similar to that of a Pt(111) single-crystal electrode, whereas that in the high potential region (O-ad formation) resembles that of a Pt(110) surface or polycrystalline Pt film.
引用
收藏
页码：8877 / 8882
页数：6
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