Few-Atomic-Layers Iron for Hydrogen Evolution from Water by Photoelectrocatalysis.
iScience
; 23(10): 101613, 2020 Oct 23.
Article
em En
| MEDLINE
| ID: mdl-33089102
ABSTRACT
The carbon-free production of hydrogen from water splitting holds grand promise for the critical energy and environmental challenges. Herein, few-atomic-layers iron (FeFAL) anchored on GaN nanowire arrays (NWs) is demonstrated as a highly active hydrogen evolution reaction catalyst, attributing to the spatial confinement and the nitrogen-terminated surface of GaN NWs. Based on density functional theory calculations, the hydrogen adsorption on FeFALGaN NWs is found to exhibit a significantly low free energy of -0.13 eV, indicative of high activity. Meanwhile, its outstanding optoelectronic properties are realized by the strong electronic coupling between atomic iron layers and GaN(10i0) together with the nearly defect-free GaN NWs. As a result, FeFALGaN NWs/n+-p Si exhibits a prominent current density of â¼ -30 mA cm-2 at an overpotential of â¼0.2 V versus reversible hydrogen electrode with a decent onset potential of +0.35 V and 98% Faradaic efficiency in 0.5 mol/L KHCO3 aqueous solution under standard one-sun illumination.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article