Journal
NATURE MATERIALS
Volume 12, Issue 6, Pages 518-522Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT3601
Keywords
-
Categories
Funding
- Molecularly Engineered Energy Materials and the Energy Materials Center at Cornell, Energy Frontiers Research Centers
- US DOE Office of Basic Energy Sciences [DE-SC001342, DE-SC0001086]
- NSF
- NIH/NIGMS [DMR-0936384]
- US DOD National Defense Science and Engineering Fellowship
- Delegation Generale pour l'Armement (DGA)
- European Research Council (ERC) [291543-IONACES]
- EADS Foundation
Ask authors/readers for more resources
Pseudocapacitance is commonly associated with surface or near-surface reversible redox reactions, as observed with RuO2 center dot xH(2)O in an acidic electrolyte. However, we recently demonstrated that a pseudocapacitive mechanism occurs when lithium ions are inserted into mesoporous and nanocrystal films of orthorhombic Nb2O5 (T-Nb2O5; refs 1,2). Here, we quantify the kinetics of charge storage in T-Nb2O5: currents that vary inversely with time, charge-storage capacity that is mostly independent of rate, and redox peaks that exhibit small voltage offsets even at high rates. We also define the structural characteristics necessary for this process, termed intercalation pseudocapacitance, which are a crystalline network that offers two-dimensional transport pathways and little structural change on intercalation. The principal benefit realized from intercalation pseudocapacitance is that high levels of charge storage are achieved within short periods of time because there are no limitations from solid-state diffusion. Thick electrodes (up to 40 mu m thick) prepared with T-Nb2O5 offer the promise of exploiting intercalation pseudocapacitance to obtain high-rate charge-storage devices.
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