Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 20, Issue 2, Pages 390-398Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b915370e
Keywords
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Funding
- National Science Foundation [CHE-9876674]
- Department of Energy Office of Basic Energy Sciences
- Welch Foundation [F-1529, F-1319]
- Center for Nano and Molecular Science and Technology
- Process Science and Technology Center at the University of Texas
- Fluid Interface Reactions, Structures and Transport (FIRST) Center
- U. S. Department of Energy, Office of Science
- Office of Basic Energy Sciences [ERKCC61]
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MnO2-mesoporous carbon hybrid nanocomposites were synthesized to achieve high values of redox pseudocapacitance at scan rates of 100 mV s(-1). High-resolution transmission electron microscopy (HRTEM) along with energy dispersive X-ray spectroscopy (EDX) demonstrated that similar to 1 nm thick MnO2 nanodomains, resembling a conformal coating, were uniformly distributed throughout the mesoporous carbon structure. HRTEM and X-ray diffraction (XRD) showed formation of MnO2 nanocrystals with lattice planes corresponding to birnessite. The electrochemical redox pseudocapacitance of these composite materials in aqueous 1 M Na2SO4 electrolyte containing as little as 2 wt% MnO2 exhibited a high gravimetric MnO2 pseudocapacitance (C-MnO2) of 560 F g(MnO2)(-1). Even for 30 wt% MnO2, a high C-MnO2 of 137 F g(MnO2)(-1) was observed at 100 mV s(- 1). Sodium ion diffusion coefficients on the order of 10(-9) to 10(-10) cm(2) s(-1) were measured using chronoamperometry. The controlled growth and conformal coating of redox-active MnO2-mesoporous carbon composites offer the potential for achieving high power energy storage with low cost materials.
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