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Crab-shell induced synthesis of ordered macroporous carbon nanofiber arrays coupled with MnCo2O4 nanoparticles as bifunctional oxygen catalyst for rechargeable Zn-Air batteries

Abstract

The oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are traditionally carried out with noble metals (such as Pt) and metal oxides (such as RuO2 and IrO2) as catalysts, respectively. Nevertheless, several key issues such as high cost, poor stability, and detrimental environmental effects limit the catalytic activity of these noble metal- and metal oxide-based catalysts. Herein, we have designed and synthesized macroporous carbon nanofiber arrays by using a natural crab shell template. Subsequently, spinel MnCo2O4 nanoparticles were embedded into the nitrogen-doped macroporous carbon nanofiber arrays (NMCNA) by the hydrothermal method. Accompaning with the good conductivity, large surface area and the doping of nitrogen, the as-prepared MnCo2O4/NMCNA exhibited remarkable catalytic performance and outstanding stability for both ORR and OER in alkaline media. The macroporous superstructures play vital role on reducing the ion transport resistance and facilitate diffusion of gaseous products (O2). At last, rechargeable Zn-air battery using MnCo2O4/NMCNA catalyst displayed an appreciably lower overpotentials, high power density, better stability as compared to commercial Pt/C, and thus raising the prospect of functional low-cost, non-precious-metal bifunctional catalysts in metal-air batteries.

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Publication details

The article was received on 27 Apr 2017, accepted on 05 Jul 2017 and first published on 06 Jul 2017


Article type: Paper
DOI: 10.1039/C7NR03009F
Citation: Nanoscale, 2017, Accepted Manuscript
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    Crab-shell induced synthesis of ordered macroporous carbon nanofiber arrays coupled with MnCo2O4 nanoparticles as bifunctional oxygen catalyst for rechargeable Zn-Air batteries

    B. Duan, Z. Guo, A. G. Tamirat, Y. Ma, Y. Wang and Y. Xia, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR03009F

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