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

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Nozari-Asbemarz, Mehran | Amiri, Mandana | Khodayari, Ali | Bezaatpour, Abolfazl | Nouhi, Sima | Hosseini, Pouya | Wark, Michael | Boukherroub, Rabah | Szunerits, Sabine

Edité par HAL CCSD ; ACS

International audience. 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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