Synthesis of compositionally tunable, hollow mixed metal sulphide CoNiS octahedral nanocages and their composition-dependent electrocatalytic activities for oxygen evolution reaction.
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Nanoscale, ISSN: 2040-3372, Vol: 9, Issue: 40, Page: 15397-15406
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- Materials Science
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 mixed metal sulphide (CoNiS) octahedral nanocages. The sulfidation of CoO octahedral nanoparticles generates CoO@CoS core-shell octahedra, and the in situ etching of the CoO core and annealing yield CoS (pentlandite) octahedral nanocages (ONC). The addition of a Ni precursor during the etching/annealing process of CoO@CoS core-shell octahedra progressively yields hollow ONC structures of CoNiS, NiS, NiS/β-NiS, and NiS/β-NiS via cation exchange reactions. Mixed cobalt/nickel sulphide, CoNiS ONC, shows superior oxygen evolution reaction activity to monometallic sulphide ONC structures, demonstrating the synergy between different metal species.