| Autor: |
Bonsu JO; Department of Energy and Materials Engineering, Dongguk University - Seoul Pil-dong, Jung-gu 04620 Seoul South Korea., Han JI; Department of Chemical and Biochemical Engineering, Dongguk University - Seoul 04620 South Korea. |
| Jazyk: |
angličtina |
| Zdroj: |
RSC advances [RSC Adv] 2020 Apr 21; Vol. 10 (27), pp. 15751-15762. Date of Electronic Publication: 2020 Apr 21 (Print Publication: 2020). |
| DOI: |
10.1039/d0ra02056g |
| Abstrakt: |
In this study, ultrahigh electrochemical performance for interconnected meso/macro-porous 2D C@α-Fe 2 O 3 synthesized via sucrose-assisted microwave combustion is demonstrated. Hematite (α-Fe 2 O 3 ) synthesized via the same approach gave an encouraging electrochemical performance close to its theoretical value, justifying its consideration as a potential supercapacitor electrode material; nonetheless, its specific capacitance was still low. The pore size distribution as well as the specific surface of bare α-Fe 2 O 3 improved from 145 m 2 g -1 to 297.3 m 2 g -1 after it was coated with sucrose, which was endowed with ordered symmetric single-layer graphene (2D graphene). Accordingly, the optimized hematite material (2D C@α-Fe 2 O 3 ) showed a specific capacitance of 1876.7 F g -1 at a current density of 1 A g -1 and capacity retention of 95.9% after 4000 cycles. Moreover, the material exhibited an ultrahigh energy density of 93.8 W h kg -1 at a power density of 150 W kg -1 . The synergistic effect created by carbon-coating α-Fe 2 O 3 resulted in modest electrochemical performance owing to extremely low charge transfer resistance at the electrode-electrolyte interface with many active sites for ionic reactions and efficient diffusion process. This 2D C@α-Fe 2 O 3 electrode material has the capacity to develop into a cost-effective and stable electrode for future high-energy-capacity supercapacitors.
Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(This journal is © The Royal Society of Chemistry.) |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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