Journal
ADVANCED ENERGY MATERIALS
Volume 1, Issue 5, Pages 901-907Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201100256
Keywords
-
Categories
Funding
- National Science Council of the Republic of China (Taiwan) [NSC-98-2221-E-007-034-MY3]
- National Tsing-Hua University
Ask authors/readers for more resources
Manganese oxide/carbon aerogel composite electrodes are prepared by a self-limiting anodic-electrochemical deposition of manganese oxide into a binder-enriched carbon aerogel layer, drop-cast on a graphite substrate, using 0.1 M Mn(CH3COO)(2)center dot 4H(2)O as the electrolyte. Manganese oxide grows in the form of thin nanofibers along the backbone of the carbon aerogel, leaving adequate working space for the electrolyte and enabling a fuller extent of the utilization of the manganese oxide to make the composite an outstanding supercapacitor electrode material. The manganese oxide is determined to be Mn3O4 with the Raman spectroscopy and high-resolution transmission electron microscopy. The rectangularity of the cyclic-voltammogram loops of the composite electrode is excellent and remains that way for scan rates up to a very-high value of 500 mV s(-1), indicating extremely good redox reversibility and cycle efficiency. At a scan rate of 25 mV s(-1), the specific capacitance, as measured in 0.5 M Na2SO4 for a potential window of 0.1-0.9 V vs. Ag/AgCl, reaches a maximum value of 503 F g(-1) and experiences only a negligible decay of less than 1% at the 6000th cycle, implying an extraordinary cycling stability. The cycling efficiency is as high as 98% at a current density of 8 A g(-1) cm(-2), showing an almost-ideal capacitive behavior. The power density reaches 48.5 kW kg(-1) and the energy density 21.6 W h kg(-1) at a scan rate of 500 mV s(-1), well above the specifications of current state-of-the-art supercapacitors.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available