Liu Kaisi, Jin Hongrun, Huang Liwei, Luo Yongxin, Zhu Zehao, Dai Simin, Zhuang Xinyan, Wang Zidong, Huang Liang, Zhou Jun
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.
Sci Adv. 2022 May 20;8(20):eabn2030. doi: 10.1126/sciadv.abn2030.
Two-dimensional (2D) oxides have unique electrical, optical, magnetic, and catalytic properties, which are promising for a wide range of applications in different fields. However, it is difficult to fabricate most oxides as 2D materials unless they have a layered structure. Here, we present a facile strategy for the synthesis of ultrathin oxide nanosheets using a self-formed sacrificial template of carbon layers by taking advantage of the Maillard reaction and violent redox reaction between glucose and ammonium nitrate. To date, 36 large-area ultrathin oxides (with thickness ranging from ~1.5 to ~4 nm) have been fabricated using this method, including rare-earth oxides, transition metal oxides, III-main group oxides, II-main group oxides, complex perovskite oxides, and high-entropy oxides. In particular, the as-obtained perovskite oxides exhibit great electrocatalytic activity for oxygen evolution reaction in an alkaline solution. This facile, universal, and scalable strategy provides opportunities to study the properties and applications of atomically thin oxide nanomaterials.
二维（2D）氧化物具有独特的电学、光学、磁学和催化性能，在不同领域的广泛应用中具有广阔前景。然而，除非大多数氧化物具有层状结构，否则很难将它们制备成二维材料。在此，我们利用葡萄糖与硝酸铵之间的美拉德反应和剧烈的氧化还原反应，提出了一种使用自形成的碳层牺牲模板合成超薄氧化物纳米片的简便策略。迄今为止，已使用该方法制备了36种大面积超薄氧化物（厚度范围为1.5至4 nm），包括稀土氧化物、过渡金属氧化物、Ⅲ主族氧化物、Ⅱ主族氧化物、复合钙钛矿氧化物和高熵氧化物。特别是，所获得的钙钛矿氧化物在碱性溶液中对析氧反应表现出优异的电催化活性。这种简便、通用且可扩展的策略为研究原子级薄氧化物纳米材料的性能和应用提供了机会。
