Oxygen evolution reaction (OER) in acid media has been intensively studied recently for its important role in proton exchange membrane electrolyzers. CeO₂-based nanomaterials have been widely used in various applications for their redox properties, oxygen vacancy, and surface activity. CeO₂-based nanocatalysts also exhibit superior catalytic performance in OER in acid media. Herein, we fabricated a highly efficient catalytic interface between IrO_x and CeO₂ (IrO_x/CeO₂), which showed a boosting OER activity with an overpotential of 217 mV at the current density of 10 mA/cm² and long-term stability for 10 h in 0.5 mol/L H₂SO₄, which were better than those of many reported catalysts. The in situ differential electrochemical mass spectrometry results demonstrated that IrO_x/CeO₂ and the commercial IrO₂ (IrO₂-com) followed the adsorbate evolution mechanism, whereas the pure CeO₂ surface followed the lattice oxygen oxidation mechanism under the same conditions for OER. These indicated that the interface of IrO_x and CeO₂ improved mass transfer efficiency and reactivity, which also prevented the lattice oxygen evolution in the CeO₂ structure and protected the whole structure. This work finds a new way for OER in acid media catalyzed by CeO₂-based nanocatalysts and promotes the design strategy for other CeO₂-based nanostructures.

Graphical Abstract

中文翻译：

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具有吸附质析出机制的高效催化界面 IrOx/CeO2 可促进酸性介质中的析氧反应

酸性介质中的析氧反应（OER）最近因其在质子交换膜电解槽中的重要作用而得到了深入研究。 CeO ₂基纳米材料因其氧化还原性能、氧空位和表面活性而被广泛用于各种应用。 CeO ₂基纳米催化剂在酸性介质中的OER中也表现出优异的催化性能。在此，我们在IrO _x和CeO ₂之间制备了高效催化界面（IrO _x /CeO ₂），该界面表现出增强的OER活性，在10 mA/cm ²的电流密度下具有217 mV的过电位和长期稳定性。在0.5 mol/LH ₂ SO ₄中反应10 h ，优于许多报道的催化剂。原位微分电化学质谱结果表明，在相同的OER条件下，IrO x / _CeO 2_和商业IrO ₂ (IrO ₂ -com)遵循吸附质演化机制，而纯CeO ₂表面遵循晶格氧氧化机制。 。这表明IrO _x和CeO ₂的界面提高了传质效率和反应活性，这也阻止了CeO ₂结构中晶格氧的析出并保护了整个结构。该工作为CeO ₂基纳米催化剂催化酸性介质中OER找到了新途径，并促进了其他CeO ₂基纳米结构的设计策略。

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