TY - JOUR
T1 - Hydrogen Peroxide Generation and Hydrogen Oxidation Reaction Properties of Ir(111)-, (100)-, and (110)-Low-Index Single-Crystal Surfaces
AU - Hayashi, Kenta
AU - Tomimori, Takeru
AU - Chida, Yoshihiro
AU - Todoroki, Naoto
AU - Wadayama, Toshimasa
N1 - Funding Information:
This study was partially supported by the New Energy and Industrial Technology Development Organization (NEDO) of Japan and JSPS KAKENHI Grant Number JP21H01645.
Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/10/7
Y1 - 2021/10/7
N2 - 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.
AB - 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.
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U2 - 10.1021/acs.jpcc.1c07322
DO - 10.1021/acs.jpcc.1c07322
M3 - Article
AN - SCOPUS:85117171713
VL - 125
SP - 21481
EP - 21487
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 39
ER -