Scalable, inexpensive, one-pot, facile synthesis of crystalline two-dimensional birnessite flakes-猫眼课题宝

DOI：

10.1016/j.matt.2022.05.038

发表时间：

2022-06

期刊：

Matter

影响因子：

18.9

通讯作者：

中科院分区：

材料科学1区

文献类型：

作者：

H. Badr;Kiana Montazeri;Tarek Aly Elmeligy;Varun Natu;M. Carey;Ramchandra Gawas;Phu-Cuong Phan;Q. Qian;Christopher Y. Li;U. Wiedwald;M. Farle;Erika Colin-Ulloa;L. Titova;M. Currie;T. Ouisse;M. Barbier;A. Rogalev;F. Wilhelm;M. Hans;J. Schneider;Chris Tandoc;Young-Jie Hu;J. Snyder;M. Barsoum

从科学和工业的角度来看，合成易于扩展、具有成本效益和生态友好的二维（2D）材料是重要的。目前，这些2D材料通过选择性蚀刻相对昂贵的层状固体（即，使用自上而下的方法）或通过高压灭菌金属盐/有机化合物来合成。在此，我们描述了一种近环境、一锅法、廉价、可扩展的途径，以通过自下而上的方法将5种不同的水不溶性含Mn前体，即Mn 3 O 4、Mn 2 O3、MnB、Mn 5SiB 2和Mn 2AlB 2转化为水钠锰矿基2D薄片，在某些情况下，所述薄片是显著结晶的。将前体粉末在50°C至80°C下浸入25重量%氢氧化四甲基铵水溶液中2至4天。使用一组表征技术确定合成薄片的结构、组成、氧化态和形态。合成的二维片显示可逆O2电催化与商业Pt/C催化剂的活性相当。

Synthesis of two-dimensional (2D) materials that is readily scalable, cost-effective, and eco-friendly is important from both scientific and industrial viewpoints. Currently, these 2D materials are synthesized either by selective etching of relatively expensive layered solids, viz. using a top-down approach, or by autoclaving metal salts/organic compounds. Herein, we describe a near-ambient, one-pot, inexpensive, scalable pathway to convert—through a bottom-up approach—5 different water-insoluble Mn-bearing precursors, viz. Mn3O4, Mn2O3, MnB, Mn5SiB2, and Mn2AlB2, into birnessite-based 2D flakes that, in some cases, are remarkably crystalline. The precursor powders are immersed in 25 wt % tetramethylammonium hydroxide aqueous solutions at 50°C to 80°C for 2 to 4 days. The structures, compositions, oxidation states, and morphologies of the synthesized flakes are determined using a battery of characterization techniques. The synthesized 2D sheets demonstrate reversible O2electrocatalysis with activities comparable with those of a commercial Pt/C catalyst.

Scalable, inexpensive, one-pot, facile synthesis of crystalline two-dimensional birnessite flakes

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