Hydrogen Peroxide Generation and Hydrogen Oxidation Reaction Properties of Ir(111)-, (100)-, and (110)-Low-Index Single-Crystal Surfaces

被引：8

作者：

Hayashi, Kenta ^{[1
]}

Tomimori, Takeru ^{[1
]}

Chida, Yoshihiro ^{[1
]}

Todoroki, Naoto ^{[1
]}

Wadayama, Toshimasa ^{[1
]}

机构：

[1] Tohoku Univ, Grad Sch Environm Studies, Sendai, Miyagi 9808579, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2021年 / 125卷 / 39期

关键词：

SCANNING ELECTROCHEMICAL MICROSCOPY; OXYGEN REDUCTION REACTION; MEMBRANE DEGRADATION; ANODE CATALYSTS; FUEL-CELLS; IMPEDANCE MEASUREMENTS; PFSA MEMBRANE; SECM TIP; IR; VOLTAMMETRY;

D O I：

10.1021/acs.jpcc.1c07322

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Hydrogen peroxide (H2O2) generation and hydrogen oxidation reaction (HOR) properties of Ir(hkl) (hkl = 111, 100, and 110) were investigated in acidic media using scanning electrochemical microscopy. In the 0.06-0.3 V vs reversible hydrogen electrode potential region, H2O2 generation properties were significantly suppressed for the Ir(hkl) surfaces in comparison with Pt(111): only the Ir(100) revealed slight evolution of H2O2 at ca. 0.1 V. Conversely, the HOR activity trend of the Ir(hkl) was Ir(111) > Ir(100) > Ir(110), and the activity of Ir(111) is approximately 70% of that of Pt(111). This study presents Ir-based nanosized catalysts whose surface comprises mainly (111) facets (such as octahedron-shape) as effective anode catalysts for polymer electrolyte fuel cells.

引用

页码：21481 / 21487

页数：7

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