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Hierarchical micro/nanostructured C doped Co/Co3O4 hollow spheres derived from PS@Co(OH)2 for oxygen evolution reaction

Abstract

The hierarchical micro/nanostructured C doped Co/Co3O4 hollow spheres was prepared by two-step treatment (annealing at 600 oC in Ar atmosphere and them at 250 oC in air) of PS@Co(OH)2 core-shell structures templated from PS microspheres without any modification. In 1 M KOH, such hollow nanopheres showed an overpotential of 352 mV at benchmark oxygen evolution reaction (OER) current density of 10 mA•cm-2, which was lower than that of RuO2 (364 mV), Co3O4 hollow nanospheres (410 mV) and C-Co/Co3O4 nanoparticles (462 mV). Importantly, the C-Co/Co3O4 hollow spheres exhibited small onset potential (1.49 V) due to their more active sites, higher electrical conductivity, specific surface area, excellent electron and ion diffusion permeability. This work provides a strategy to design and fabricate earth-abundant, low-cost electrocatalysts for water splitting in practical applications.

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Publication details

The article was received on 23 Mar 2017, accepted on 05 May 2017 and first published on 05 May 2017


Article type: Paper
DOI: 10.1039/C7TA02539D
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Hierarchical micro/nanostructured C doped Co/Co3O4 hollow spheres derived from PS@Co(OH)2 for oxygen evolution reaction

    L. Hang, Y. Sun, D. Men, S. Liu, Q. Zhao, W. Cai and Y. Li, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA02539D

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