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2018-04-03

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/153559

Catalytic H-2 Evolution with CoO, Co(OH)(2) and CoO(OH) Nanoparticles Generated from a Molecular Polynuclear Co Complex

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https://doi.org/10.1002/ejic.201800033

Resum

Electrochemical water reduction by employing first-row transition-metal nanoparticles (NPs) constitutes a sustainable way for the generation of H-2. We have synthesized Co-based NPs from a molecular Co-II/Co-III precursor after its reductive decomposition at -1.86 V versus NHE in different organic solvents. These NPs are able to electrochemically reduce water at pH 14. SEM, EDX and XPS analyses have allowed the determination of the chemical nature of the as-deposited NPs: CoO when using MeCN as the solvent and CoO(OH) when employing either dichloromethane (DCM) or MeOH. After 2 h of constant polarization at 10 mAcm(-2), the electrocatalytic activity of the NPs obtained in MeCN and DCM decreases, whereas it increases for those obtained in MeOH. In this solvent, the overpotential is reduced by 215-220 mV and the specific current density is tripled. Interestingly, during this activation process in MeOH, the precursor CoO(OH) NPs are converted into Co(OH)(2). The implications of these results in the context of the current research in the field are also discussed.

Matèries

Cobalt, Hidrogen, Nanopartícules, Electrocatàlisi

Matèries (anglès)

Cobalt, Hydrogen, Nanoparticles, Electrocatalysis

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Articles publicats en revistes (Química Inorgànica i Orgànica)

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GIL-SEPULCRE, Marcos, GIMBERT-SURIÑACH, Carolina, AGUILÀ AVILÉS, David, VELASCO AMIGÓ, Verónica, GARCIA-ANTON, Jordi, LLOBET, Antoni, AROMÍ BEDMAR, Guillem, BOFILL, Roger, SALA, Xavier. Catalytic H-2 Evolution with CoO, Co(OH)(2) and CoO(OH) Nanoparticles Generated from a Molecular Polynuclear Co Complex. _European Journal of Inorganic Chemistry_. 2018. Vol. 13, núm. 1499-1505. [consulta: 22 de gener de 2026]. ISSN: 1434-1948. [Disponible a: https://hdl.handle.net/2445/153559]

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