析氧
过电位
铱
催化作用
材料科学
化学工程
分解水
纳米颗粒
氧化物
电化学
化学
纳米技术
光催化
物理化学
电极
生物化学
工程类
冶金
作者
Xin Ma,Chaoyu Yang,Fengru Zhang,Ke Fang,Qingqing Cheng,Hui Yang,Hui Yang
标识
DOI:10.1016/j.ijhydene.2023.06.068
摘要
Proton exchange membrane water electrolysis (PEMWE) exhibits the superior benefits including high gas purity, high power density and wide variable loading but is still limited by the prohibitive cost and dearth of iridium (Ir)-based anode catalysts. Herein, we report a low-loading Ir-based catalyst with ultrasmall iridium nanoparticles (1.46 ± 0.01 nm) supported on oxygen-vacancy-rich tungsten oxide nanofibers (WO3-x) through electrospinning combined with surfactant-free microwave-assisted polyol reduction method for active acidic oxygen evolution reaction (OER). According to structural analysis and theoretical calculation, the charge transfer from W to Ir is induced by the strong electronic interaction at the Ir and WO3-x interface, thereby raising the electron density surrounding the Ir sites and favoring to boost OER activity. The resultant [email protected]3-x exhibits an excellent overpotential of ca. 276 [email protected] mA cm−2 and remarkable durability. This study offers a new path for promoting the activity and durability of electrocatalysts while minimizing the mass loading of Ir towards OER.
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