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1D Monoclinic Ir x Ru 1‐x O 2 Solid Solution with Ru‐Enhanced Electrocatalytic Activity for Acidic Oxygen Evolution Reaction
Author(s) -
Qin Keyang,
Yu Hao,
Zhu Wenxiang,
Zhou Yunjie,
Guo Zhiyong,
Shao Qi,
Wu Yangbo,
Wang Xuepeng,
Li Youyong,
Ji Yujin,
Liao Fan,
Liu Yang,
Kang Zhenhui,
Shao Mingwang
Publication year - 2025
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202402226
Subject(s) - monoclinic crystal system , materials science , oxygen evolution , ruthenium , solid solution , oxygen , crystallography , inorganic chemistry , chemistry , catalysis , crystal structure , electrochemistry , electrode , metallurgy , organic chemistry
Abstract The rutile phase IrO 2 , as a promising catalyst for oxygen evolution reaction (OER), still falls short of satisfactory activity. Here, a novel 1D monoclinic phase iridium‐ruthenium oxide solid solution (m‐Ir x Ru 1‐x O 2 ) is reported. For m‐Ir x Ru 1‐x O 2 with different metal proportions, the optimal m‐Ir 0.91 Ru 0.09 O 2‐δ catalyst exhibits excellent OER activity under acidic conditions with an overpotential of 180 mV at 10 mA cm −2 . As an anode catalyst in a proton exchange membrane electrolyzer, m‐Ir 0.91 Ru 0.09 O 2‐δ with a low catalyst loading (0.1 mg cm −2 ) can operate ≈256 h at 1.8 V with a high current density over 900 mA cm −2 at room temperature. Such a satisfied stability may have originated from the specific morphology and crystal structure, which is confirmed by the transient potential scanning test. Density functional theory calculations show that the Ru in the m‐Ir x Ru 1‐x O 2 facilitates decreasing the OER overpotentials due to the electron transfer from Ru to Ir.