过电位
材料科学
催化作用
析氧
碳纳米管
化学工程
分解水
纳米颗粒
兴奋剂
质子交换膜燃料电池
氧气
纳米技术
无机化学
电化学
物理化学
化学
有机化学
电极
工程类
光电子学
光催化
作者
Jiacai Kuang,Binglu Deng,Zhongqing Jiang,Yongjie Wang,Zhong‐Jie Jiang
标识
DOI:10.1002/adma.202306934
摘要
The development of cost-effective catalysts for oxygen evolution reaction (OER) in acidic media is of paramount importance. This work reports that Sr-doped solid solution structural ultrafine IrMnO2 nanoparticles (NPs) (≈1.56 nm) on the carbon nanotubes (Sr-IrMnO2/CNTs) are efficient catalysts for the acidic OER. Even with the Ir use dosage 3.5 times lower than that of the commercial IrO2, the Sr-IrMnO2/CNTs only need an overpotential of 236.0 mV to drive 10.0 mA cm-2 and show outstanding stability for >400.0 h. Its Ir mass activity is 39.6 times higher than that of the IrO2 at 1.53 V. The solid solution and Sr-doping structure of Sr-IrMnO2 are the main origin of the high catalytic activity and excellent stability of the Sr-IrMnO2/CNTs. The density function theory calculations indicate that the solid solution structure can promote strong electronic coupling between Ir and Mn, lowering the energy barrier of the OER rate-determining step. The Sr-doping can enhance the stability of Ir against the chemical corrosion and demetallation. Water electrolyzers and proton exchange membrane water electrolyzers assembled with the Sr-IrMnO2/CNTs show superb performance and excellent durability in the acid media.
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