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Ultrathin cobalt oxide nanostructures with morphology-dependent electrocatalytic oxygen evolution activity

Abstract

Engineering compositions, structures, and defects can endow nanomaterials with optimized catalytic properties. Here, we report that cobalt oxide (CoOx) ultrathin nanosheets (UTNS, ~1.6 nm thick) with large number of oxygen defects and mixed cobalt valences can be obtained through a facial one-step hydrothermal protocol. The large number of oxygen defects make the ultrathin CoOx nanosheet a superior OER catalyst with a low overpotential of 315 and 365 mV at the current density of 50 and 200 mA cm–2, respectively. The stable framework-like architectures of the UTNS further ensure their high OER activity and durability. Our method represents a facile one-step preparation of CoOx nanostructures with tunable compositions, morphologies, defects, and thus promoted OER properties. This strategy may find its wider applicability in designing active, robust, and easy-to-obtain catalysts for OER and other electrocatalytic systems.

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Supplementary files

Publication details

The article was received on 03 Jul 2018, accepted on 07 Oct 2018 and first published on 08 Oct 2018


Article type: Paper
DOI: 10.1039/C8NR05337E
Citation: Nanoscale, 2018, Accepted Manuscript
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    Ultrathin cobalt oxide nanostructures with morphology-dependent electrocatalytic oxygen evolution activity

    A. Yin, C. Hu, N. Zhang, Y. Wang, Y. Ni, Y. Hao and X. Su, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR05337E

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