Nonprecious and shape-controlled Co3O4-CoO@Co electrocatalysts with defect-rich and spin-state altering properties to accelerate hydrogen evolution reaction at large current densities over a wide pH range
[Display omitted] •Morphology-dependent Heterointerface Co3O4-CoO@Co catalysts are successfully synthesized.•The SPH-Co3O4-CoO@Co catalyst requires ultra-low overpotential to drive the 50 mAcm−2 over a wide pH range.•Benefitting from the defective sites and electronic structure engineering, the SPH-...
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Published in | Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 495; p. 153442 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.09.2024
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Subjects | |
Online Access | Get full text |
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Summary: | [Display omitted]
•Morphology-dependent Heterointerface Co3O4-CoO@Co catalysts are successfully synthesized.•The SPH-Co3O4-CoO@Co catalyst requires ultra-low overpotential to drive the 50 mAcm−2 over a wide pH range.•Benefitting from the defective sites and electronic structure engineering, the SPH-Co3O4-CoO@Co exhibits a large current density.
In this study, efficient HER activity is achieved through the successful preparation of Co3O4-CoO@Co catalysts that are morphology-dependent. It is proposed that the distinctive skeletal polyhedron (SPH) morphology of the Co3O4-CoO@Co catalyst shows outstanding HER performances over the universal pH range. The heterostructure catalyst exhibits a current density of 50 mAcm−2 at an ultra-low overpotential of 28, 62, and 138 mV under 0.5 M H2SO4, 1 M KOH, and 1 M PBS electrolytes, respectively. Experimental and theoretical studies indicate that electron-enriched Co2+ in the CoO site is favorable for H+ cation adsorption and high valence Co3+ in the Co3O4 site is favorable for H2O molecule activation and dissociation in acidic, neutral, and alkaline electrolytes. Benefitting from an empty eg 3d orbital with a strong Jahn–Teller effect, a high density of spin states, and a large number of oxygen vacancies, the SPH-Co3O4-CoO@Co catalyst is demonstrated to provide faster hydrogen evolution reaction. |
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ISSN: | 1385-8947 |
DOI: | 10.1016/j.cej.2024.153442 |