Issue 19, 2023

Atomically dispersed Ru supported on microporous CoO ultrathin nanosheets synthesized by melamine induction for a highly efficient oxygen evolution reaction

Abstract

Two dimensional materials show unique advantages in catalysis. In this work, it was found that melamine could induce the directional growth of cobalt-based catalysts to form an ultra-thin two-dimensional hexagonal nanosheet structure with only 1.5 nm. In addition, these hexagonal nanosheets (HNs) could grow into a microporous structure under high temperature conditions, and the finally formed CoO hexagonal porous nanosheets (HPNs) had a surface area 11.3 times that of the nanoparticles. Embedding 1.25 wt% of monoatomic ruthenium in the CoO HPNs (CoO/Ru1.25% HPNs) allowed the catalyst to have more active charge storage and transfer centers. The results showed that the overpotential of CoO/Ru1.25% HPNs was 64 mV lower than that of CoO nanoparticles at 10 mA cm−2. The Tafel slope of CoO/Ru1.25% HPNs was only half that of CoO nanoparticles, indicating that a small amount of Ru dispersion and the two-dimensional structure control significantly increased the kinetic rate in the oxygen evolution reaction. The DFT results showed that the Ru single atoms in CoO/Ru HPNs (111) possessed the lowest energy barrier (1.19 eV). The Ru single atoms could effectively reconstruct the neighboring localized structure in the formation of ˙OOH, which desirably decreased the free energy of the system.

Graphical abstract: Atomically dispersed Ru supported on microporous CoO ultrathin nanosheets synthesized by melamine induction for a highly efficient oxygen evolution reaction

Supplementary files

Article information

Article type
Paper
Submitted
07 Mar 2023
Accepted
15 Apr 2023
First published
18 Apr 2023

J. Mater. Chem. C, 2023,11, 6336-6346

Atomically dispersed Ru supported on microporous CoO ultrathin nanosheets synthesized by melamine induction for a highly efficient oxygen evolution reaction

D. Guo, C. Chen, Y. Wang, Y. Wang and C. Zhang, J. Mater. Chem. C, 2023, 11, 6336 DOI: 10.1039/D3TC00825H

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements