Oxygen spillover from RuO2 to MoO3 enhances the activity and durability of RuO2 for acidic oxygen evolution,Energy & Environmental Science

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Oxygen spillover from RuO2 to MoO3 enhances the activity and durability of RuO2 for acidic oxygen evolution
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2024-08-06 , DOI: 10.1039/d4ee02549k
Wangyan Gou _{1,

2,

3} , Shishi Zhang ₄ , Yichen Wang ₂ , Xiaohe Tan _{1,

2} , Linqing Liao _{1,

2} , Zening Qi ₅ , Min Xie ₅ , Yuanyuan Ma _{1,

2} , Yaqiong Su ₄ , Yongquan Qu ₂

Affiliation

Balancing the trade-off between the activity and durability of acidic oxygen evolution reaction (OER) catalysts is of key concern in the field of electrocatalysis. RuO₂ delivers good activity but displays poor stability due to the over-oxidation and consequent leachability of surface ruthenium species. Herein, we report an oxygen spillover strategy by designing RuO₂/MoO₃ catalysts with abundant and intimate interfaces to enable spillover of the reactive *O intermediate from RuO₂ to MoO₃ and thereby suppress over-oxidation and dissolution of RuO₂, delivering both high activity and stability of Ru-based electrocatalysts. RuO₂/MoO₃ catalysts exhibited a significantly low overpotential of 167 mV at 10 mA cm⁻² and negligible degradation of OER performance within a period of 300 h in 0.5 M H₂SO₄. Experimental evidence (in situ Raman spectra, cyclic voltammetry analysis, operando Fourier transform infrared spectroscopy, etc.), along with theoretical calculations demonstrated the occurrence of oxygen spillover from RuO₂ to MoO₃ and the subsequent participation of lattice oxygen of MoO₃ instead of RuO₂ for the steps of the release of oxygen, generation of oxygen vacancies and rehabilitation of the lattice oxygen during the acidic OER. This study provides a unique approach utilizing oxygen spillover to address the challenge associated with balancing the activity and stability of Ru-based OER electrocatalysts.

中文翻译：

从 RuO2 到 MoO3 的氧气溢出增强了 RuO2 酸性析氧的活性和耐久性

平衡酸性析氧反应（OER）催化剂的活性和耐久性之间的权衡是电催化领域的关键问题。 RuO ₂具有良好的活性，但由于表面钌物质的过度氧化和随后的可浸出性而表现出较差的稳定性。在此，我们报告了一种氧溢出策略，通过设计具有丰富且紧密的界面的RuO ₂ /MoO ₃催化剂，使反应性*O中间体从RuO ₂溢出到MoO ₃ ，从而抑制RuO ₂的过度氧化和溶解，同时提供钌基电催化剂的高活性和稳定性。 RuO ₂ /MoO ₃催化剂在10 mA cm ^-2下表现出167 mV的显着低过电势，并且在0.5 MH ₂ SO ₄中300小时内OER性能的退化可以忽略不计。实验证据（原位拉曼光谱、循环伏安分析、操作傅里叶变换红外光谱等）），以及理论计算证明了氧从RuO ₂溢出到MoO ₃的发生，以及随后MoO ₃的晶格氧代替RuO ₂参与氧的释放、氧空位的产生和晶格修复的步骤酸性OER过程中的氧气。这项研究提供了一种利用氧气溢出的独特方法来解决与平衡钌基 OER 电催化剂的活性和稳定性相关的挑战。

更新日期：2024-08-06

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