کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1787879 1023454 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nickel–cobalt oxide/activated carbon composite electrodes for electrochemical capacitors
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Nickel–cobalt oxide/activated carbon composite electrodes for electrochemical capacitors
چکیده انگلیسی

Nanostructured synthesis of nickel–cobalt oxide/activated carbon composite by adapting a co-precipitation protocol was revealed by transmission electron microscopy. X-ray diffraction analysis confirmed that nickel–cobalt oxide spinel phase was maintained in the pure and composite phases. Cyclic voltammetry, galvanostatic charge–discharge tests and ac impedance spectroscopy were employed to elucidate the electrochemical properties of the composite electrodes in 1.0 M KCl. The specific capacitance which was the sum of double-layer capacitance of the activated carbon and pseudocapacitance of the metal oxide increased with the composition of nickel–cobalt oxide before showing a decrement for heavily-loaded electrodes. Utilisation of nickel–cobalt oxide component in the composite with 50 wt. % loading displayed a capacitance value of ∼59 F g−1. The prepared composite electrodes exhibited good electrochemical stability.


► Novel synthesis of NiCo2O4/activated carbon (AC) composite by co-precipitation.
► NiCo2O4/AC is reported for the first time as electrode for supercapacitors.
► Subsolidus phase formed between NiCo2O4 and activated carbon.
► NiCo2O4 composite displayed a high capacitance value of ∼59 F g−1.
► Homogeneous blending of NiCo2O4 and AC ensures stability in cycle testing.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Current Applied Physics - Volume 12, Issue 6, November 2012, Pages 1421–1428
نویسندگان
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