Issue 11, 2022

Three-dimensional CoOOH nanoframes confining high-density Mo single atoms for large-current-density oxygen evolution

Abstract

Layered transition-metal oxyhydroxides (MOOHs) emerge as promising noble-metal-free electrocatalysts for the oxygen evolution reaction (OER), yet are subject to a limited number of active sites at edges with an inactive basal plane. Herein, we report that a large number of in-plane active sites can be generated by confining high density of 16 wt% molybdenum single atoms in the basal-plane lattice of CoOOH (Mo-CoOOH). By constructing robust three-dimensional (3D) nanoframes to prevent layer-stacking and maximize exposure of active basal planes, the catalyst achieves an unprecedented OER activity at a large current density of 2000 mA cm−2, exhibiting the lowest overpotential of 400 mV among all previously reported catalysts with a high durability of over 120 hours. Multiple spectrometry characterization studies and first-principles calculations reveal that lattice-confined Mo atoms can bond moderately with OER intermediates, thereby serving as active sites for the reaction. This strategy provides a new path to design high-performance MOOH electrocatalysts with rich in-plane active sites.

Graphical abstract: Three-dimensional CoOOH nanoframes confining high-density Mo single atoms for large-current-density oxygen evolution

Supplementary files

Article information

Article type
Paper
Submitted
12 Nov. 2021
Accepted
28 Febr. 2022
First published
28 Febr. 2022

J. Mater. Chem. A, 2022,10, 6242-6250

Three-dimensional CoOOH nanoframes confining high-density Mo single atoms for large-current-density oxygen evolution

L. Tang, L. Yu, C. Ma, Y. Song, Y. Tu, Y. Zhang, X. Bo and D. Deng, J. Mater. Chem. A, 2022, 10, 6242 DOI: 10.1039/D1TA09729F

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