当前位置: X-MOL 学术Matter › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Scalable, inexpensive, one-pot, facile synthesis of crystalline two-dimensional birnessite flakes
Matter ( IF 17.3 ) Pub Date : 2022-06-16 , DOI: 10.1016/j.matt.2022.05.038
Hussein O. Badr , Kiana Montazeri , Tarek El-Melegy , Varun Natu , Michael Carey , Ramchandra Gawas , Phu Phan , Qian Qian , Christopher Y. Li , Ulf Wiedwald , Michael Farle , Erika Colin-Ulloa , Lyubov V. Titova , Marc Currie , Thierry Ouisse , Maxime Barbier , Andrei Rogalev , Fabrice Wilhelm , Marcus Hans , Jochen M. Schneider , Christopher Tandoc , Young-Jie Hu , Joshua Snyder , Michel W. Barsoum

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 O2 electrocatalysis with activities comparable with those of a commercial Pt/C catalyst.



中文翻译:

结晶二维水钠锰矿薄片的可扩展、廉价、一锅法、简便的合成

从科学和工业的角度来看,合成易于扩展、具有成本效益和环保的二维 (2D) 材料非常重要。目前,这些二维材料是通过选择性蚀刻相对昂贵的层状固体来合成的,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。在这里,我们描述了一种近乎环境、一锅法、廉价、可扩展的途径,通过自下而上的方法转化 5 种不同的水不溶性含锰前体,即。Mn 3 O 4、Mn 2 O 3、MnB、Mn 5 SiB 2和Mn 2 AlB 2,变成基于水钠锰矿的二维薄片,在某些情况下,这些薄片非常结晶。将前体粉末在 50°C 至 80°C 下浸入 25 wt% 四甲基氢氧化铵水溶液中 2 至 4 天。使用一系列表征技术确定合成薄片的结构、组成、氧化态和形态。合成的二维片材表现出可逆的 O 2电催化活性,其活性与商业 Pt/C 催化剂的活性相当。

更新日期:2022-06-16
down
wechat
bug