Chen Xue, Kong Yilin, Yin Hongfei, Yang Xiaoyong, Zhao Qiuyu, Xiao Dongdong, Wang Zhili, Zhang Yongzheng, Xue Qikun
School of Physics and Physical Engineering, Qufu Normal University, Qufu, 273165, China.
School of Materials Science and Engineering, Jilin University, Changchun, 130022, China.
Small. 2024 Nov;20(46):e2403427. doi: 10.1002/smll.202403427. Epub 2024 Jul 30.
The development of highly efficient electrocatalysts for the sluggish anodic oxygen evolution reaction (OER) is crucial to meet the practical demand for water splitting. In this study, an effective approach is proposed that simultaneously enhances interfacial interaction and catalytic activity by modifying FeO/CoS heterojunction using Ru doping strategy to construct an efficient electrocatalytic oxygen evolution catalyst. The unique morphology of Ru doped FeO (Ru-FeO) nanoring decorated by CoS nanoparticles ensures a large active surface area and a high number of active sites. The designed Ru-FeO/CoS catalyst achieves a low OER overpotential (264 mV) at 10 mA cm and demonstrates exceptional stability even at high current density of 100 mA cm, maintaining its performance for an impressive duration of 90 h. The catalytic performance of this Ru-FeO/CoS catalyst surpasses that of other iron-based oxide catalysts and even outperforms the state-of-the-art RuO. Density functional theory (DFT) calculation as well as experimental in situ characterization confirm that the introduction of Ru atoms can enhance the interfacial electron interaction, accelerating the electron transfer, and serve as highly active sites reducing the energy barrier for rate determination step. This work provides an efficient strategy to reveal the enhancement of electrocatalytic oxygen evolution activity of heterojunction catalysts by doping engineering.
开发高效的电催化剂用于缓慢的阳极析氧反应（OER）对于满足水分解的实际需求至关重要。在本研究中，提出了一种有效的方法，即通过Ru掺杂策略修饰FeO/CoS异质结，同时增强界面相互作用和催化活性，以构建高效的电催化析氧催化剂。由CoS纳米颗粒修饰的Ru掺杂FeO（Ru-FeO）纳米环的独特形貌确保了大的活性表面积和大量的活性位点。所设计的Ru-FeO/CoS催化剂在10 mA cm时实现了低的OER过电位（264 mV），并且即使在100 mA cm的高电流密度下也表现出优异的稳定性，在长达90小时的时间内保持其性能。这种Ru-FeO/CoS催化剂的催化性能超过了其他铁基氧化物催化剂，甚至优于目前最先进的RuO。密度泛函理论（DFT）计算以及实验原位表征证实，Ru原子的引入可以增强界面电子相互作用，加速电子转移，并作为高活性位点降低速率决定步骤的能量势垒。这项工作提供了一种有效的策略，以揭示通过掺杂工程提高异质结催化剂的电催化析氧活性。
