过电位
析氧
X射线吸收光谱法
分解水
材料科学
催化作用
电解水
化学工程
电化学
吸收光谱法
电解
纳米技术
化学
物理化学
光催化
电极
生物化学
物理
量子力学
工程类
电解质
作者
Shangheng Liu,Huang Tan,Yucheng Huang,Qiaobao Zhang,Haiping Lin,Ling Li,Zhiwei Hu,Wei‐Hsiang Huang,Chih‐Wen Pao,Jyh‐Fu Lee,Qingyu Kong,Qi Shao,Yong Xu,Xiaoqing Huang
标识
DOI:10.1002/adma.202305659
摘要
Oxygen evolution reaction (OER) plays a key role in proton exchange membrane water electrolysis (PEMWE), yet the electrocatalysts still suffer from the disadvantages of low activity and poor stability in acidic conditions. Here, a new class of CdRu2 IrOx nanoframes with distorted structure for acidic OER is successfully fabricated. Impressively, CdRu2 IrOx displays an ultralow overpotential of 189 mV and an ultralong stability of 1500 h at 10 mA cm⁻2 toward OER in 0.5 M H2 SO4 . Moreover, a PEMWE using the distorted CdRu2 IrOx can be steadily operated at 0.1 A cm⁻2 for 90 h. Microstructural analyses and X-ray absorption spectroscopy (XAS) demonstrate that the synergy between Ru and Ir in CdRu2 IrOx induces the distortion of Ru-O, Ir-O, and Ru-M (M = Ru, Ir) bonds. In situ XAS indicates that the applied potential leads to the deformation octahedral structure of RuOx /IrOx and the formation of stable Ru5+ species for OER. Theoretical calculations also reveal that the distorted structures can reduce the energy barrier of rate-limiting step during OER. This work provides an efficient strategy for constructing structural distortion to achieve significant enhancement on the activity and stability of OER catalysts.
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