Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 40, Issue 30, Pages 9225-9234Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2015.05.153
Keywords
Nitrogen-doped reduced graphene oxide; LiMn2O4; Electrocatalyst; Oxygen reduction reaction; Aluminium-air battery
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Funding
- National Nature Science Foundation of China [51474255]
- Hunan Provincial Natural Science Foundation of China [13JJ6003]
- Open-End Fund for the Valuable and Precision Instruments of Central South University [CSUZC201502]
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Nitrogen-doped reduced graphene oxide nanosheets modified with LiMn2O4 (LMO) nanoparticles as low cost, nontoxic and efficient catalyst for oxygen reduction reaction (ORR) were synthesized by a simple two step hydrothermal method. The physical properties and the activity of the composites toward ORR were investigated using X-ray diffraction (XRD) spectroscopy, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray (EDX) spectra, and electrochemical measurements, including cyclic voltammograms (CV), steady state polarization curves and electrochemical impedance spectroscopy (EIS) in O-2-saturated 0.1 M KOH electrolyte. The LiMn2O4 supported on nitrogen-doped reduced graphene oxide (LMO/N-rGO) showed more positive onset potential, half wave potential, faster charge transfer, and a higher cathodic peak current in alkaline media than that of LiMn2O4/rGO and N-rGO. Furthermore, air electrodes with hybrid catalysts were fabricated to test the discharged performance in Al-air batteries under ambient air condition. The batteries with LMO/N-rGO cathode displayed the higher energy density of 585 mAh g(-1) and sluggish potential drop. The improved catalytic activity and battery performance of LMO/N-rGO can be attributed to the effect of active sites induced by nitrogen, and synergic covalent coupling between the nitrogen-doped graphene sheets and spinel lithium manganese oxide. These results confirm that LMO/N-rGO is a promising material for air cathodes with good activity and stability in aluminium-air battery. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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