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Synthesis of compositionally tunable, hollow CoxNiySz octahedral nanocages and their composition-dependent electrocatalytic activities for oxygen evolution reaction

Abstract

Hollow nanostructures such as nanocages and nanoframes can serve as advanced catalysts with their enlarged active surface areas, and hence they have been of widespread interest. Despite the recent progress in the synthesis of this class of nanomaterials, hollow nanostructures with tunable compositions and controlled morphologies have rarely been reported. Here, we report a facile synthetic route to a series of compositionally tunable, hollow metal sulphide octahedral nanocages. The sulfidation of CoO octahedral nanoparticles generates CoO@CoxSy core–shell octahedra, and the in situ etching of CoO core and annealing yields Co9S8 (pentlandite) octahedral nanocages (ONC). The addition of Ni precursor during the etching/annealing of CoO@CoxSy octahedra progressively yields hollow ONC structures of Co9-xNixS8, Ni9S8, Ni9S8/β-NiS, and Ni3S2/β-NiS via cation exchange reactions. Mixed cobalt/nickel sulphide, Co9-xNixS8 ONC shows superior oxygen evolution reaction activity to monometallic sulphide ONC structures, demonstrating the synergy between different metal species.

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Publication details

The article was received on 16 Jun 2017, accepted on 11 Sep 2017 and first published on 12 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR04327A
Citation: Nanoscale, 2017, Accepted Manuscript
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    Synthesis of compositionally tunable, hollow CoxNiySz octahedral nanocages and their composition-dependent electrocatalytic activities for oxygen evolution reaction

    J. Kim, H. Jin, A. Oh, H. Baik, S. H. Joo and K. Lee, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR04327A

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