作者：

Sihui Pan¹, Hanzhuo Luo^1,2, Penghao Li¹, Chenchen Li², Long Chen², Wei-Hsiang Huang³, Chih-Wen Pao³, Youyong Li¹, Zhiwei Hu⁴, Yujin Ji, ¹* Mingwang Shao, ¹* and Qi Shao²

单位：

¹Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China

²College of Chemistry , Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, China

³National Synchrotron Radiation Research Centre, 101 Hsin-Ann Road, Hsinchu 30076, Taiwan

⁴Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Street 40 01187, Dresden, Germany

摘要：

Electrochemical water splitting represents a promising strategy for hydrogen production, with oxygen evolution reaction (OER) being a critical half-reaction. Iridium dioxide (IrO2) is an advanced OER catalyst owing to excellent stability. However, regulating key intermediates and decreasing reaction barriers remain great challenges. Here, 2D metastable-phase IrO2 nanosheet (M-IrO2 NS) by a mixed molten salt method is reported. M-IrO2 NS exhibits a 3% compressive strain along the a-axis (a = 4.30 & Aring; vs 4.43 & Aring;) compared to 1D metastable-phase IrO2 nanoribbon (M-IrO2 NR). In 0.5 M H2SO4, M-IrO2 NS exhibits a low overpotential of 186 mV at 10 mA cm-2 and a high mass activity of 2071.8 mA mgIr -1 at 1.5 V versus reversible hydrogen electrode (RHE). When integrated into a proton exchange membrane water electrolysis (PEMWE), M-IrO2 NS maintains a current density of 2.83 A cm-2 at 1.8 V for 1600 h without degradation. Mechanistic investigations reveal a transition from adsorbate evolution mechanism (AEM) in M-IrO2 NR to oxide pathway mechanism (OPM) in M-IrO2 NS, confirmed by the Fourier transform infrared measurements, density-functional-theory calculations and mass spectrometry measurements. This study demonstrates the impact of dimensional regulation on optimizing the OER and provides a new platform for electrocatalyst development.

影响因子：

18.5

分区情况：

一区

链接：

https://doi.org/10.1002/adfm.202516175