Supported IrO2 Nanocatalyst with Multilayered Structure for Proton Exchange Membrane Water Electrolysis

• DOI: 10.1002/adma.202407717
• Publication Date: 2024-08-08T05:36:01Z
• Authors: Yuannan Wang; Zicheng Zhao; Xiao Liang; Xiao Zhao; Xiyang Wang; Subhajit Jana; Yimin A. Wu; Yongcun Zou; Lu Li; Hui Chen; Xiaoxin Zou
• Keywords: Overlayer; Oxygen evolution; Electrolysis of water; Nanorod

Abstract The design of a low‐iridium‐loading anode catalyst layer with high activity and durability is key challenge for proton exchange membrane water electrolyzer (PEMWE). Here, the synthesis novel supported IrO 2 nanocatalyst tri‐layered structure, dubbed @TaO x @TaB that composed ultrasmall nanoparticles anchored on amorphous TaO overlayer TaB nanorods reported. composite electrocatalyst shows great stability toward oxygen evolution reaction (OER) in acid, thanks to its dual‐interface structural feature. electronic interaction /TaO interface can regulate coverage surface hydroxyl groups, Ir 3+ / 4+ ratio, redox peak potential enhancing OER activity, while dense prevent further oxidation substrate stabilize catalytic layers improving during OER. be used fabricate an PEMWE iridium‐loading as low 0.26 mg cm −2 . delivers current densities at cell voltages (e.g., 3.9 A @2.0 V), gives excellent retention more than 1500 h 2.0 density.