Wang Kaiteng, Zhou Jun, Fu Lei, Kang Yunqing, Zhou Zilin, Cheng Yonghong, Wu Kai, Yamauchi Yusuke
Center of Nanomaterials for Renewable Energy, State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, 710049, P. R. China.
Research Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.
Small. 2024 Nov;20(48):e2404239. doi: 10.1002/smll.202404239. Epub 2024 Sep 2.
Perovskite oxides are considered highly promising candidates for oxygen evolution reaction (OER) catalysts due to their low cost and adaptable electronic structure. However, modulating the electronic structure of catalysts without altering their nanomorphology is crucial for understanding the structure-property relationship. In this study, a simple plasma bombardment strategy is developed to optimize the catalytic activity of perovskite oxides. Experimental characterization of plasma-treated LaCoFeO (P-LCFO) reveals abundant oxygen vacancies, which expose numerous active sites. Additionally, X-ray photoelectron spectroscopy and X-ray absorption fine structure analyses indicate a low Co valence state in P-LCFO, likely due to the presence of these oxygen vacancies, which contributes to an optimized electronic structure that enhances OER performance. Consequently, P-LCFO exhibits significantly improved OER catalytic activity, with a low overpotential of 294 mV at a current density of 10 mA cm, outperforming commercial RuO. This work underscores the benefits of plasma engineering for studying structure-property relationships and developing highly active perovskite oxide catalysts for water splitting.
钙钛矿氧化物因其低成本和可调节的电子结构，被认为是析氧反应（OER）催化剂极具潜力的候选材料。然而，在不改变催化剂纳米形态的情况下调节其电子结构，对于理解结构-性能关系至关重要。在本研究中，开发了一种简单的等离子体轰击策略来优化钙钛矿氧化物的催化活性。对经等离子体处理的LaCoFeO（P-LCFO）进行的实验表征揭示了大量氧空位，这些氧空位暴露出众多活性位点。此外，X射线光电子能谱和X射线吸收精细结构分析表明，P-LCFO中Co的价态较低，这可能归因于这些氧空位的存在，有助于形成优化的电子结构，从而提高OER性能。因此，P-LCFO表现出显著改善的OER催化活性，在电流密度为10 mA cm时过电位低至294 mV，优于商业RuO。这项工作强调了等离子体工程在研究结构-性能关系以及开发用于水分解的高活性钙钛矿氧化物催化剂方面的优势。
