Lim, Y.S. and Lai, Chin Wei and Hamid, Sharifah Bee Abd (2017) Porous 3D carbon decorated Fe3O4 nanocomposite electrode for highly symmetrical supercapacitor performance. RSC Advances, 7 (37). pp. 23030-23040. ISSN 2046-2069, DOI https://doi.org/10.1039/c7ra00572e.
Full text not available from this repository.Abstract
In the present study, a hierarchical nanostructure of Fe3O4-porous hydrochar (p-Fe/HC) core shell nanocomposite was readily synthesized via a facile hydrothermal carbonization route followed by a KOH activation. In our new invention, hydrothermally formed core-shell nanoparticles underwent KOH activation to create micro- and mesopores forming porous hydrochar outer-shell on Fe3O4 nanoparticles core for improving capacitance performance. These porous structures eventually could act as potential electrolyte-accessible pathways which led to the contribution of pseudocapacitance connecting from the core (reaction at Fe3O4/electrolyte interface). Based on our electrochemical capacitive performance evaluation, p-Fe/HC nanocomposite electrode which comprised of 5 wt% Fe3O4 nanoparticles (±45 nm) could reach the specific capacitance of 259.3 F g-1 with a superior wide potential window of 1.8 V in 1 mol L-1 Na2SO4 aqueous electrolyte. By comparing KOH activation of pristine porous hydrochar and p-Fe/HC, an exceptionally high specific surface area (1712.8 m2 g-1) with bimodal type pores size distribution was observed. In addition, p-Fe/HC displayed a maximum energy density of 29.2 W h kg-1 at a power density of 1.2 kW kg-1, which is about 26% higher energy density than that of pristine porous hydrochar. In this manner, the synthesized porous hydrochar outer-shell could provide additional electrochemical stability to Fe3O4 core, preventing volume change at high current loading as well as conductive coating to enhance pseudocapacitance performance. Consequently, a symmetrical nanocomposite cell was successfully designed, with high capacitance retention of 95.1% after 5000 cycles.
| Item Type: | Article |
|---|---|
| Funders: | UNSPECIFIED |
| Uncontrolled Keywords: | Capacitance; Carbon; Carbonaceous adsorbents; Carbonization; Chemical activation; Electrodes; Electrolytes; Nanocomposites; Nanoparticles; Nanostructures; Shells (structures); Supercapacitor |
| Subjects: | Q Science > QD Chemistry |
| Divisions: | Nanotechnology & Catalysis Research Centre |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 10 Aug 2017 08:02 |
| Last Modified: | 19 Oct 2018 04:06 |
| URI: | http://eprints.um.edu.my/id/eprint/17668 |
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