Journal article
Designing Pseudocapacitance for Nb 2 O 5 /Carbide-Derived Carbon Electrodes and Hybrid Devices
Langmuir, v 33(37), pp 9407-9415
19 Sep 2017
PMID: 28545299
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Composite structures for electrochemical energy storage are prepared on the basis of using the high-rate lithium ion insertion properties of Nb
O
. The Nb
O
is anchored on reduced graphene oxide (rGO) by hydrothermal synthesis to improve the charge-transfer properties, and by controlling the surface charge, the resulting Nb
O
-rGO particles are attached to a high-surface-area carbide-derived carbon scaffold without blocking its exfoliated layers. The electrochemical results are analyzed using a recently published multiscale physics model that provides significant insights regarding charge storage kinetics. In particular, the composite electrode exhibits surface-confined charge storage at potentials of <1.7 V (vs Li/Li
), where faradaic processes dominate, and electrical double layer charge storage at potentials of >2.2 V. A hybrid device composed of the composite electrode with activated carbon as the positive electrode demonstrates increased energy density at power densities comparable to an activated carbon device, provided the hybrid device operates in the faradaic potential range.
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Details
- Title
- Designing Pseudocapacitance for Nb 2 O 5 /Carbide-Derived Carbon Electrodes and Hybrid Devices
- Creators
- Chun-Han LaiDavid AshbyMelissa MozYury Gogotsi - Department of Materials Science and Engineering and A. J. Drexel Nanomaterials Institute, Drexel University , Philadelphia, Pennsylvania 19104, United StatesLaurent PilonBruce Dunn
- Publication Details
- Langmuir, v 33(37), pp 9407-9415
- Publisher
- American Chemical Society; Washington, DC
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000411549700018
- Scopus ID
- 2-s2.0-85029716276
- Other Identifier
- 991014877792104721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary