Hydrogen Peroxide Generation and Hydrogen Oxidation Reaction Properties of Ir(111)-, (100)-, and (110)-Low-Index Single-Crystal Surfaces
Hydrogen Peroxide Generation and Hydrogen Oxidation Reaction Properties of Ir(111)-, (100)-, and (110)-Low-Index Single-Crystal Surfaces
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DOI：
10.1021/acs.jpcc.1c07322
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发表时间：
2021-09
期刊：
影响因子：
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通讯作者：
K. Hayashi;Takeru Tomimori;Yoshihiro Chida;Naoto Todoroki;T. Wadayama
中科院分区：
文献类型：
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作者：
K. Hayashi;Takeru Tomimori;Yoshihiro Chida;Naoto Todoroki;T. Wadayama
用扫描电化学显微镜研究了Ir(Hkl)(Hkl=111、100和110)在酸性介质中过氧化氢(H_2O_2)的生成和氢氧化反应(HOR)特性。在0.06-0.3V的可逆氢电极电位区，Ir(Hkl)表面的H_2O_2生成性能明显低于Pt(111)表面：只有Ir(100)表面在0.1V附近有轻微的H_2O_2析出。相反，Ir(Hkl)表面的HOR活性趋势是Ir(111)&Gt；Ir(100)&Gt；Ir(110)，Ir(111)的活性约为Pt(111)的70%。本研究提出了一种表面主要由(111)面(如八面体形状)组成的Ir基纳米催化剂，作为聚合物电解质燃料电池的有效阳极催化剂。
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, H2O2generation properties were significantly suppressed for the Ir(hkl) surfaces in comparison with Pt(111): only the Ir(100) revealed slight evolution of H2O2at 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.