Angstrom‐Confined Electrochemical Synthesis of Sub‐Unit‐Cell Non‐Van Der Waals 2D Metal Oxides

• DOI: 10.1002/adma.202301506
• Publication Date: 2023-04-28T23:24:57Z
• Authors: Dali Ji; Yuna Lee; Yuta Nishina; Kazuhide Kamiya; Rahman Daiyan; Dewei Chu; Xinyue Wen; Masamichi Yoshimura; Priyank Kumar; Daria V. Andreeva; Kostya S. Novoselov; Gwan‐Hyoung Lee; Rakesh Joshi; Tobias Foller
• Keywords: Nanometre; Angstrom

Bottom-up electrochemical synthesis of atomically thin materials is desirable yet challenging, especially for non-van der Waals (non-vdW) materials. Thicknesses below a few nanometers have not been reported yet, posing the question how can non-vdW be electrochemically synthesized. This important as with (sub-)unit-cell thickness often show remarkably different properties compared to their bulk form or films several thickness. Here, straightforward method utilizing angstrom-confinement laminar reduced graphene oxide (rGO) nanochannels introduced obtain centimeter-scale network (<4.3 Å) 2D-transition metal oxides (2D-TMO). The provides limitation, forcing sub-unit-cell growth 2D-TMO oxygen and vacancies. It showcased that Cr2 O3 , material without significant catalytic activity evolution reaction (OER) in form, activated high-performing catalyst if synthesized 2D form. displays high while retaining stability promising yield unexplored fundamental science applications. shown advantages bottom-up synthesis, like simplicity, yield, mild conditions, TMO limited dimensions.