Nano-engineering of prussian blue analogues to core-shell architectures: Enhanced catalytic activity for zinc-air battery

Journal of Colloid and Interface Science
Tayyaba NajamSyed Shoaib Ahmad Shah

Abstract

To substitute precious metal with non-precious electrocatalysts, that can work efficiently, still remains a great challenge. Herein, we fabricated the series of nitrogen doped carbon (NC) and CoFe-NC core-shell architectures to produce dual-functionality towards oxygen reduction/evolution reactions and ultimately for Zn-air battery. The addition of NC tends to prevent the reduction of Co/Fe nanoparticles during pyrolysis which not only provide improved catalytic sites but also boost the specific surface area, graphitization degree, electron and mass transfer capacity. With distinctive core-shell morphology, the as-synthesized CoFe-NC/NC shows superior OER performance with low overpotential (270 mV) than IrO2 (340 mV) at 10 mA cm-2 and nearly close ORR activity with respect to Pt/C. When fabricated as zinc-air battery application, CoFe-NC/NC shows 58 mW cm-2 higher peak power density than that of air-cathodes made of Pt/C and IrO2. Further, our catalyst shows good durability due to the synergistic effect of Fe/Co and NC shell.

Citations

Dec 19, 2021·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Syed Shoaib Ahmad ShahMohammed Muzibur Rahman

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