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12 results on '"Jabeen, Maher"'

7. Nanocasting synthesis of an iron nitride-ordered mesopore carbon composite as a novel electrode material for supercapacitors

Author

Cheng Xiaoyu, Feng Jian, Jabeen Maher, Linlin Qi, Weiming Song, Ishaq Muhammad, Liyang Xu, and Sun Li

Subjects
Supercapacitor, Materials science, General Chemical Engineering, Nanoparticle, chemistry.chemical_element, Nanotechnology, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Capacitance, 0104 chemical sciences, law.invention, Iron nitride, chemistry.chemical_compound, chemistry, Chemical engineering, law, Electrode, Calcination, 0210 nano-technology, Mesoporous material, Carbon
Abstract

Herein, a series of novel iron nitride (Fe2N)/cubic-ordered mesoporous carbon (OMC) composites (Fe2N@OMC) were synthesized via a facile nanocasting route and ammonia calcination. Physical characterization results indicate that small non-aggregated Fe2N nanoparticles were evenly distributed on the external surface and in the pores of the carbon material with a linear array of mesopores in a regular interval arrangement. An electrochemical test was carried out using Fe2N@OMC as a negative electrode of a supercapacitor in 6 mol L−1 KOH aqueous electrolytes. The results indicated that the obtained Fe2N@OMC-2 exhibited a superior specific capacitance of 547 F g−1 at 1 mV s−1 and 520 F g−1 at 0.5 A g−1, an excellent rate capability (398 F g−1 at 20 A g−1 with capacitance retention of 76%), and an outstanding cycling stability. After 1000 cycles, the specific capacitance retention of Fe2N@OMC-2 remained 85%, which was much higher than 28% of the bare Fe2N.

Published
2017

12. Self-Assembly Synthesis and Electrochemical Performance of Partially Reduced Graphene Oxide Supported Hierarchical MnO2 Nanonocomposite for Supercapacitor.

Author

Ishaq, Muhammad, Jabeen, Maher, and Song, Weiming

Subjects
*SUPERCAPACITOR electrodes, *GRAPHENE oxide, *BINDING agents, *NANOSTRUCTURED materials
Abstract

Summary: Partially reduced graphene oxide supported hierarchical birnessite-type manganese oxide (MnO2) nanonocomposite (MnO2-pGO) with large surface area (116 m2 g-1) were successfully synthesized by a facile ultrahigh dilute vesicle solution approach, via surfactant Hexadecyltrimethylammonium bromide (CTAB) and sodium dodecylbenzenesulfonate (SDBS), as a structure-directing agent. The resultant structure exhibit hierarchical porous MnO2 nanocluster, which were self-assembled from elongated nanorods and grafted successfully on the surface of the pGO nanosheets. Furthermore, the obtained MnO2-pGO nanocomposite was found to exhibit favorable electrochemical activity showing ultra-high specific capacitance of (282 F/g at 0.5 A/g), the enhanced rate capability of (67.7%) at 10 A/g), the most stable capacitance retention (91.4 %of its initial capacitance was retains after 5000 cycles, with ~100% Coulombic efficiency). The result suggests that the approach is not only effective to deposit MnO2 over the pGO sheets, but also offered great promise to prepare other pGO-metal oxide composite electrode materials for supercapacitor. [ABSTRACT FROM AUTHOR]

Published
2019
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