Yu Xiwen, Wang Bing, Wang Cheng, Zhuang Chen, Yao Yingfang, Li Zhaosheng, Wu Congping, Feng Jianyong, Zou Zhigang
Eco-materials and Renewable Energy Research Center, College of Engneering and Applied Sciences, Nanjing University, Nanjing, Jiangsu, 210093, China.
Jiangsu Key Laboratory for Nano Technology, National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing, Jiangsu, 210093, China.
Small. 2021 Nov;17(45):e2103412. doi: 10.1002/smll.202103412. Epub 2021 Sep 27.
High-entropy materials (HEMs) with unique configuration and physicochemical properties have attracted intensive research interest. However, 2D HEMs have not been reported yet. To find out unique properties of combining 2D materials and HEMs, a series of 2D high-entropy hydrotalcites (HEHs) is created by coprecipitation method, including quinary, septenary, and even novenary metallic elements. It is found that the fast synthetic kinetics of coprecipitation process conquers the thermodynamically solubility limitation of different elements, which is the prerequisite condition to form HEHs. As the oxygen evolution reaction (OER) electrocatalysts, HEHs show significantly decreased apparent activation energy compared with low-entropy hydrotalcites (LEHs) due to the lattice distortion induced by the multimetallic character of HEHs. This work opens up a new avenue for the development of 2D HEMs, which broadens the family of HEMs and presents a most promising platform for exploring the unknown properties of HEMs.
具有独特结构和物理化学性质的高熵材料（HEMs）已引起了广泛的研究兴趣。然而，二维高熵材料尚未见报道。为了探索二维材料与高熵材料结合的独特性质，通过共沉淀法制备了一系列二维高熵水滑石（HEHs），其中包括五元、七元和甚至九元金属元素。研究发现，共沉淀过程的快速合成动力学克服了不同元素的热力学溶解度限制，这是形成高熵水滑石的先决条件。作为析氧反应（OER）电催化剂，由于高熵水滑石的多金属特性引起的晶格畸变，与低熵水滑石（LEHs）相比，高熵水滑石的表观活化能显著降低。这项工作为二维高熵材料的发展开辟了一条新途径，拓宽了高熵材料家族，并为探索高熵材料的未知性质提供了一个极有前景的平台。
