Protonation Enables Durable and Efficient Water Oxidation on Commercial TiO2/IrO2

IF 4.6 2区化学 Q2 CHEMISTRY, PHYSICAL

The Journal of Physical Chemistry Letters Pub Date : 2025-09-10 DOI:10.1021/acs.jpclett.5c02227

Da Huang, Yu Du, Haoyang Hu, Shicheng Yan* and Zhigang Zou,

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Abstract

The oxygen evolution reaction (OER) performance of commercial TiO₂-supported IrO₂ (IrO₂/TiO₂) suffers from the high electron transfer barriers at the IrO₂/TiO₂ interface. Herein, we develop a cathodic polarization strategy to protonate TiO₂ (p-TiO₂) in a commercial IrO₂/TiO₂ catalyst. The high-density Ti³⁺–OH polaronic states on the surface of protonated TiO₂ greatly contribute to the decrease in the electron transfer barriers at the IrO₂/TiO₂ interface. As a result, the IrO₂/p-TiO₂ catalyst exhibits an ultralow overpotential of 246 ± 3 mV at 10 mA/cm² and durability over 200 h, attributed to electron compensation from Ti³⁺–OH states suppressing active Ir overoxidation. This electrochemical modification, requiring neither a complex apparatus nor high-temperature processing, establishes a new paradigm for designing high-performance anode catalysts.

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质子化使商业TiO2/IrO2持久有效的水氧化。

商用TiO2负载IrO2 （IrO2/TiO2）的析氧反应（OER）性能受到IrO2/TiO2界面上高电子转移垒的影响。在此，我们开发了一种阴极极化策略，在商业IrO2/TiO2催化剂中质子化TiO2 （p-TiO2）。质子化TiO2表面高密度的Ti3+-OH极化态极大地降低了IrO2/TiO2界面上的电子转移势垒。结果表明，IrO2/p-TiO2催化剂在10 mA/cm2下具有246±3 mV的超低过电位，并且具有超过200小时的耐久性，这是由于Ti3+-OH态的电子补偿抑制了活性Ir过氧化。这种电化学修饰既不需要复杂的设备，也不需要高温处理，为设计高性能阳极催化剂建立了新的范例。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

The Journal of Physical Chemistry Letters CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY

CiteScore

9.60

自引率

7.00%

发文量

1519

审稿时长

1.6 months

期刊介绍： The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.