Intramolecular electronic coupling in porous iron cobalt (oxy)phosphide nanoboxes enhances the electrocatalytic activity for oxygen evolution

Efficient electrocatalysts are of great importance in improving the water splitting efficiency. Herein, we develop a self-templating strategy to construct porous iron cobalt (oxy)phosphide (Fe-Co-P) nanoboxes as promising pre-catalysts for the oxygen evolution reaction in alkaline solution. The cons...

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Bibliographic Details
Published in:Energy & environmental science 2019-01, Vol.12 (11), p.3348-3355
Main Authors: Zhang, Huabin, Zhou, Wei, Dong, Juncai, Lu, Xue Feng, Lou, Xiong Wen (David)
Format: Article
Language:English
Subjects:
Atomic properties
Catalysts
Cobalt
Computer applications
Construction
Coupling
Electrocatalysts
Electrochemical analysis
Electrochemistry
Evolution
Iron
Oxidation
Oxygen
Oxygen evolution reactions
Phosphides
Water splitting
X ray absorption
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Summary:Efficient electrocatalysts are of great importance in improving the water splitting efficiency. Herein, we develop a self-templating strategy to construct porous iron cobalt (oxy)phosphide (Fe-Co-P) nanoboxes as promising pre-catalysts for the oxygen evolution reaction in alkaline solution. The constructed Fe-Co-P nanoboxes exhibit excellent electrocatalytic activity and afford a current density of 10 mA cm −2 at a small overpotential of 269 mV. Moreover, the structural evolution of the metal phosphides in the oxygen evolution process has been well monitored. X-ray absorption near-edge structure analyses and computational studies reveal that the structural merits and the effective intramolecular electronic coupling between the Fe and Co atoms via P/O bridges are responsible for the greatly improved electrocatalytic activity. The effective intramolecular electronic coupling between the Fe and Co atoms via P/O bridges greatly enhances the electrocatalytic activity of Fe-Co (oxy)phosphide nanoboxes.
ISSN:1754-5692
1754-5706
DOI:10.1039/c9ee02787d