武汉大学付磊团队报道了具有相可控性的超薄高熵氧化物的合成。相关研究成果发表在2024年3月4日出版的国际知名学术期刊《美国化学会杂志》。

具有超薄几何结构的高熵氧化物（HEOs）尤其有望在不同领域表现出非凡的性能。相结构被认为是决定HEOs性质的关键因素，使其相控制合成具有吸引力。然而，多种组分的本征相结构和物理化学性质的差异，使得与目标相形成单相HEOs具有挑战性。

该文中，研究人员提出了一种自晶格框架引导的策略，以实现具有所需相结构的超薄HEOs的合成，包括岩盐、尖晶石、钙钛矿和萤石相。Ga助剂的加入有助于通过降低形成能来形成高熵混合态。所制备的超薄尖晶石HEOs是一种对水电解析氧反应，具有高活性和稳定性的优良催化剂。

该工作为先进应用的HEOs合成注入了新的活力，加快了它们的相位工程。

附：原文原文

Title: Synthesis of Ultrathin High-Entropy Oxides with Phase Controllability

Author: Jingjing Liang, Junlin Liu, Huiliu Wang, Zeyuan Li, Guanghui Cao, Ziyue Zeng, Sheng Liu, Yuzheng Guo, Mengqi Zeng, Lei Fu

Issue&Volume: March 4, 2024

Abstract: High-entropy oxides (HEOs) with an ultrathin geometric structure are especially expected to exhibit extraordinary performance in different fields. The phase structure is deemed as a key factor in determining the properties of HEOs, rendering their phase control synthesis tempting. However, the disparity in intrinsic phase structures and physicochemical properties of multiple components makes it challenging to form single-phase HEOs with the target phase. Herein, we proposed a self-lattice framework-guided strategy to realize the synthesis of ultrathin HEOs with desired phase structures, including rock-salt, spinel, perovskite, and fluorite phases. The participation of the Ga assistor was conducive to the formation of the high-entropy mixing state by decreasing the formation energy. The as-prepared ultrathin spinel HEOs were demonstrated to be an excellent catalyst with high activity and stability for the oxygen evolution reaction in water electrolysis. Our work injects new vitality into the synthesis of HEOs for advanced applications and undoubtedly expedites their phase engineering.

DOI: 10.1021/jacs.3c10868

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.3c10868