<i>In Situ</i> Synthesis of Co<sub>3</sub>O<sub>4</sub>/CoFe<sub>2</sub>O<sub>4</sub> Derived from a Metal–Organic Framework on Nickel Foam: High-Performance Electrocatalyst for Water Oxidation - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue ACS Applied Energy Materials Année : 2021

In Situ Synthesis of Co3O4/CoFe2O4 Derived from a Metal–Organic Framework on Nickel Foam: High-Performance Electrocatalyst for Water Oxidation

Mehran Nozari-Asbemarz
Mandana Amiri
Ali Khodayari
Abolfazl Bezaatpour
Sima Nouhi
Pouya Hosseini
Michael Wark

Résumé

Co3O4/CoFe2O4 decorated on nickel foam (NF/Co3O4/CoFe2O4) was synthesized from a metal–organic framework by a solvothermal approach using nicotinic acid as an organic linker followed by annealing at 500 °C. The electrochemical activity of NF/Co3O4/CoFe2O4 for the oxygen evolution reaction (OER) was assessed in alkaline medium. Under basic conditions (pH > 10), the composite electrode revealed enhanced electrocatalytic OER activity requiring an overpotential of 215 mV versus RHE to reach 10 mA cm–2 with a Tafel slope of 90 mV dec–1. The enhanced OER activity was ascribed to the presence of Co3+ and Fe3+ in the octahedral sites of Co3O4 and CoFe2O4, respectively, and their synergic effect in Co3O4/CoFe2O4. This anode showed a stable current density of about 160 mA cm–2 for 20 h; the same Co3O4/CoFe2O4/NF anode was applied for several OER experiments without loss of activity.
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Dates et versions

hal-03545006 , version 1 (27-01-2022)

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Mehran Nozari-Asbemarz, Mandana Amiri, Ali Khodayari, Abolfazl Bezaatpour, Sima Nouhi, et al.. In Situ Synthesis of Co3O4/CoFe2O4 Derived from a Metal–Organic Framework on Nickel Foam: High-Performance Electrocatalyst for Water Oxidation. ACS Applied Energy Materials, 2021, 4 (3), pp.2951-2959. ⟨10.1021/acsaem.1c00429⟩. ⟨hal-03545006⟩
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