Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Cobalt Sulfide/Spongy functionalized Graphene nanostructured electrodes for High-Performance Supercapacitors
A simple approach is illustrated for the preparation of functionalized spongy graphene/cobalt sulfide (FG-CoS) nanocomposites as unified, porous 3-dimensional (3D) network crinkly sheets. These crinkly sheets contain the reduced spongy graphene oxide (SGO) sheets and the intercalated CoS nanoparticl...
Saved in:
| Main Author: | |
|---|---|
| Format: | Thesis |
| Published: |
AUC Knowledge Fountain
2019
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613411991355392 |
|---|---|
| access_status_str | Open Access |
| author | Afifi, Israa Mohamed |
| author_browse | Afifi, Israa Mohamed |
| author_facet | Afifi, Israa Mohamed |
| author_sort | Afifi, Israa Mohamed |
| collection | Thesis |
| dc_rights_str_mv | The author retains all rights with regard to copyright. The author certifies that written permission from the owner(s) of third-party copyrighted matter included in the thesis, dissertation, paper, or record of study has been obtained. The author further certifies that IRB approval has been obtained for this thesis, or that IRB approval is not necessary for this thesis. Insofar as this thesis, dissertation, paper, or record of study is an educational record as defined in the Family Educational Rights and Privacy Act (FERPA) (20 USC 1232g), the author has granted consent to disclosure of it to anyone who requests a copy. |
| description | A simple approach is illustrated for the preparation of functionalized spongy graphene/cobalt sulfide (FG-CoS) nanocomposites as unified, porous 3-dimensional (3D) network crinkly sheets. These crinkly sheets contain the reduced spongy graphene oxide (SGO) sheets and the intercalated CoS nanoparticles within the spongy graphene. The fabricated FG-CoS composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and Raman spectroscopy. The synthesized materials were examined as supercapacitor materials in an aqueous electrolyte (3M KOH) using cyclic voltammetry (CV) at a wide range of potential scan rates, and galvanostatic charge/discharge at various current densities. The FG-CoS electrode yielded a maximum specific capacitance of 1072 F/g at a scan rate of 1 mV/s. In addition, it showed outstanding cyclability retention of 117% after the 1000th cycle at 100mV/s. The obtained energy density is 35.2 Wh/kg along with a power density of 250 W/kg at 1.0 A/g. Such high performance can be attributed to the synergistic effect of graphene and CoS, where CoS is sandwiched between graphene nanosheets. This makes the FG/CoS composite a promising electrode material for a superior-performance supercapacitor. |
| format | Thesis |
| id | oai:fount.aucegypt.edu:etds-1772 |
| institution | American University in Cairo (Egypt) |
| last_indexed | 2026-06-10T12:35:43.583Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from AUC Knowledge Fountain — bepress |
| publishDate | 2019 |
| publishDateRange | 2019 |
| publishDateSort | 2019 |
| publisher | AUC Knowledge Fountain |
| publisherStr | AUC Knowledge Fountain |
| record_format | dspace |
| source_str | AUC Knowledge Fountain — bepress |
| spelling | oai:fount.aucegypt.edu:etds-1772 Cobalt Sulfide/Spongy functionalized Graphene nanostructured electrodes for High-Performance Supercapacitors Afifi, Israa Mohamed A simple approach is illustrated for the preparation of functionalized spongy graphene/cobalt sulfide (FG-CoS) nanocomposites as unified, porous 3-dimensional (3D) network crinkly sheets. These crinkly sheets contain the reduced spongy graphene oxide (SGO) sheets and the intercalated CoS nanoparticles within the spongy graphene. The fabricated FG-CoS composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and Raman spectroscopy. The synthesized materials were examined as supercapacitor materials in an aqueous electrolyte (3M KOH) using cyclic voltammetry (CV) at a wide range of potential scan rates, and galvanostatic charge/discharge at various current densities. The FG-CoS electrode yielded a maximum specific capacitance of 1072 F/g at a scan rate of 1 mV/s. In addition, it showed outstanding cyclability retention of 117% after the 1000th cycle at 100mV/s. The obtained energy density is 35.2 Wh/kg along with a power density of 250 W/kg at 1.0 A/g. Such high performance can be attributed to the synergistic effect of graphene and CoS, where CoS is sandwiched between graphene nanosheets. This makes the FG/CoS composite a promising electrode material for a superior-performance supercapacitor. 2019-06-01T07:00:00Z thesis application/pdf https://fount.aucegypt.edu/etds/773 https://fount.aucegypt.edu/context/etds/article/1772/viewcontent/Thesis_20pdf.pdf The author retains all rights with regard to copyright. The author certifies that written permission from the owner(s) of third-party copyrighted matter included in the thesis, dissertation, paper, or record of study has been obtained. The author further certifies that IRB approval has been obtained for this thesis, or that IRB approval is not necessary for this thesis. Insofar as this thesis, dissertation, paper, or record of study is an educational record as defined in the Family Educational Rights and Privacy Act (FERPA) (20 USC 1232g), the author has granted consent to disclosure of it to anyone who requests a copy. Theses and Dissertations AUC Knowledge Fountain Supercapacitors Energy storage Energy materials Spongy graphene Cobalt sulphide high performance NA NA |
| spellingShingle | Supercapacitors Energy storage Energy materials Spongy graphene Cobalt sulphide high performance NA NA Afifi, Israa Mohamed Cobalt Sulfide/Spongy functionalized Graphene nanostructured electrodes for High-Performance Supercapacitors |
| title | Cobalt Sulfide/Spongy functionalized Graphene nanostructured electrodes for High-Performance Supercapacitors |
| title_full | Cobalt Sulfide/Spongy functionalized Graphene nanostructured electrodes for High-Performance Supercapacitors |
| title_fullStr | Cobalt Sulfide/Spongy functionalized Graphene nanostructured electrodes for High-Performance Supercapacitors |
| title_full_unstemmed | Cobalt Sulfide/Spongy functionalized Graphene nanostructured electrodes for High-Performance Supercapacitors |
| title_short | Cobalt Sulfide/Spongy functionalized Graphene nanostructured electrodes for High-Performance Supercapacitors |
| title_sort | cobalt sulfide spongy functionalized graphene nanostructured electrodes for high performance supercapacitors |
| topic | Supercapacitors Energy storage Energy materials Spongy graphene Cobalt sulphide high performance NA NA |
| url | https://fount.aucegypt.edu/etds/773 https://fount.aucegypt.edu/context/etds/article/1772/viewcontent/Thesis_20pdf.pdf |
| work_keys_str_mv | AT afifiisraamohamed cobaltsulfidespongyfunctionalizedgraphenenanostructuredelectrodesforhighperformancesupercapacitors |