کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7715165 | 1497443 | 2015 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Spinel LiMn2O4 nanoparticles dispersed on nitrogen-doped reduced graphene oxide nanosheets as an efficient electrocatalyst for aluminium-air battery
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Spinel LiMn2O4 nanoparticles dispersed on nitrogen-doped reduced graphene oxide nanosheets as an efficient electrocatalyst for aluminium-air battery Spinel LiMn2O4 nanoparticles dispersed on nitrogen-doped reduced graphene oxide nanosheets as an efficient electrocatalyst for aluminium-air battery](/preview/png/7715165.png)
چکیده انگلیسی
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 O2-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 gâ1 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 40, Issue 30, 10 August 2015, Pages 9225-9234
Journal: International Journal of Hydrogen Energy - Volume 40, Issue 30, 10 August 2015, Pages 9225-9234
نویسندگان
Yisi Liu, Jie Li, Wenzhang Li, Yaomin Li, Qiyuan Chen, Yang Liu,