| Publication Type |
Journal Article |
| Title |
gamma-FeOOH and amorphous Ni-Mn hydroxide on carbon nanofoam paper electrodes for hybrid supercapacitors |
| Authors |
Tuyen Nguyen Maria F. Montemor |
| Groups |
|
| Journal |
JOURNAL OF MATERIALS CHEMISTRY A |
| Year |
2018 |
| Month |
February |
| Volume |
6 |
| Number |
6 |
| Pages |
2612-2624 |
| Abstract |
This work reports the preparation of gamma-FeOOH and amorphous Ni-Mn hydroxide on carbon nanofoam paper (CNFP) by galvanostatic electrodeposition for application in hybrid FeOOH-CNFP parallel to Ni-Mn hydroxide-CNFP supercapacitors working in alkaline electrolytes. The gamma-FeOOH on CNFP displayed a porous morphology composed of fluffy nanoflakes. It showed an enhanced redox response in the negative working potential range of -1.5-0 V vs. SCE with a storage capacity of 3.48 C cm(-2) at 10 mA cm(-2) and a response rate of 71\% when the current densities increased from 10 mA cm(-2) to 50 mA cm(-2). The amorphous Ni-Mn hydroxide on CNFP displayed a porous morphology composed of fine nanoflakes. It showed an enhanced redox response in the positive working potential range of 0-0.5 V vs. SCE with a storage capacity of 1.54 C cm(-2) at 10 mA cm(-2) and a response rate of 73\% when the current densities increased from 10 mA cm(-2) to 50 mA cm(-2). The hybrid FeOOH-CNFP parallel to Ni-Mn hydroxide-CNFP supercapacitor delivered a high energy density of 1515 mW h cm(-2), at a power density of 9 mW cm(-2) at a working voltage of 1.8 V and a long cycle life with a capacity retention of 95\% after 10 000 charge-discharge cycles. Self-discharge studies revealed the main contribution of the FeOOH-CNFP electrode to the voltage drop of the supercapacitor cell. Activation-controlled processes governed the self-discharge of the FeOOH-CNFP electrode, while mixed activation-controlled and diffusion-controlled processes governed the self-discharge of the Ni-Mn hydroxide-CNFP electrode. |
| DOI |
http://dx.doi.org/10.1039/c7ta05582j |
| ISBN |
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| Publisher |
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| Book Title |
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| ISSN |
2050-7488 |
| EISSN |
2050-7496 |
| Conference Name |
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| Bibtex ID |
ISI:000424466300022 |
| Observations |
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