The development of an active OER electrocatalyst has remained indispensable for the scalable production of hydrogen.1 The incorporation of iron (Fe) into cobalt metal-organic framework (Co-MOF) tunes the electronic structure of the parent MOF as well as enhances their electrocatalytic characteristics.2 Herein, we have synthesized new Co-MOF, Fe-MOF, and series of Co/Fe-bimetallic MOFs using pyrazine and hydrofluoric acid, and respective metal-sulfate sources with a general formula of [CoFC4H4N2(SO4)0.5], [FeFC4H4N2(SO4)0.5], and [Co1-xFexFC4H4N2(SO4)0.5] respectively, via a single-step solvothermal method. The as-synthesized MOFs are directly employed for the evaluation of their electrocatalytic performances. The optimized amount of Fe significantly impacted the electrocatalytic performance of the bimetallic MOF towards water oxidation. Particularly, the Co0.75Fe0.25-MOF needs only 239 and 257 mV of overpotential to deliver 10 and 50 mA/cm2 current density in alkaline electrolytic conditions. The Co0.75Fe0.25-MOF shows a lower Tafel slope (42 mV/dec.) among other bimetallic MOFs and even the commercial RuO2 and excellent durability (with ~8 mV increases in overpotential after 18 hours of electrolysis) and 97.05% Faradaic efficiency which further evidenced its catalytic Excellency. These findings explore the intrinsic properties of MOF-based electrocatalysts and prospect the suitability for future water electrolysis.

Effect of iron on three dimensional Cobalt Metal-Organic Framework for electrochemical Oxygen Evolution Reaction

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27th CRSI National Symposium in Chemistry

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