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Active Site-Engineered Bifunctional Electrocatalysts of Ternary Spinel Oxides, M0.1Ni0.9Co2O4 (M: Mn, Fe, Cu, Zn) for the Air Electrode of Rechargeable Zinc-Air Batteries

Abstract

How to discover efficient and cost-effective catalysts for rechargeable metal-air batteries is one of the major scientific challenges in future energy storage/conversion technologies because of the sluggish kinetics of the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Based on the octahedral site preference energy (OSPE) model, engineering the active sites of ternary M0.1Ni0.9Co2O4 for the OER and ORR in alkaline solutions is demonstrated in this work. From the X-ray photoelectron spectroscopic (XPS) and OSPE model, Fe-doped NiCo2O4 (Fe0.1Ni0.9Co2O4) provides the highest Co2+/Co3+ ratio and the lowest Ni2+/Ni3+ ratio, leading to the enhanced electrocatalytic activities toward both the OER and ORR in alkaline electrolytes from the rotating ring disk voltammograms. In addition, all ternary oxides are examined as bifunctional electrocatalysts for the air electrode of rechargeable zinc-air batteries from the polarization curves of the ORR and OER in 6 M KOH under the ambient air. The full-cell configuration using the Fe0.1Ni0.9Co2O4-coated air electrode exhibits the maximum power density of 150 mW cm-2 at a current density of 250 mA cm-2 under the ambient air and facilitates long-term cycle stability (over 66.7 h at 10 mA cm-2). These results confirm the excellent bifunctional electrocatalytic activity of Fe0.1Ni0.9Co2O4 which is considered a practical catalyst for the air electrode of rechargeable Zn-air batteries.

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Publication details

The article was received on 19 Jul 2017, accepted on 15 Sep 2017 and first published on 15 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA06302D
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Active Site-Engineered Bifunctional Electrocatalysts of Ternary Spinel Oxides, M0.1Ni0.9Co2O4 (M: Mn, Fe, Cu, Zn) for the Air Electrode of Rechargeable Zinc-Air Batteries

    Y. Lu, Y. Chien, C. Liu, T. You and C. Hu, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06302D

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