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A superionic state in nano-porous double-layer capacitors: insights from Monte Carlo simulations
Abstract
Recently observed anomalous properties of ionic-liquid-based nanoporous supercapacitors [C. Largot et al., J. Am. Chem. Soc., 2008, 130, 2730-2731] have attracted much attention. Here we present Monte Carlo simulations of a model ionic liquid in slit-like metallic nanopores. We show that exponential screening of the electrostatic interactions of ions inside a pore, as well as the image-charge attraction of ions to the pore surface, lead to the 'anomalous' increase of the capacitance with decreasing the pore width. The simulation results are in good agreement with the experimental data. The capacitance as a function of voltage is almost constant for low voltages and vanishes above a certain threshold voltage. For very narrow pores, these two regions are separated by a peak. With increase of the pore size the peak turns into a bump and disappears for wide pores. This effect, related to a specific character of the voltage-induced filling of nanopores with counterions at high densities, is yet to be verified experimentally.
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Cited by
Efficient storage mechanisms for building better supercapacitors
Salanne, M., Rotenberg, B., Naoi, K., Kaneko, K., Taberna, P.-L., Grey, C. P., Dunn, B., & Simon, P. (2016) · Nature Energy · doi:10.1038/nenergy.2016.70 · Cited by 2,181
On the molecular origin of supercapacitance in nanoporous carbon electrodes
Merlet, C., Rotenberg, B., Madden, P. A., Taberna, P.-L., Simon, P., Gogotsi, Y., & Salanne, M. (2012) · Nature Materials · doi:10.1038/nmat3260 · Cited by 1,042
Highly confined ions store charge more efficiently in supercapacitors
Merlet, C., Péan, C., Rotenberg, B., Madden, P. A., Daffos, B., Taberna, P. L., Simon, P., & Salanne, M. (2013) · Nature Communications · doi:10.1038/ncomms3701 · Cited by 744
Zhang, S., Zhang, J., Zhang, Y., & Deng, Y. (2017) · Chemical Reviews · doi:10.1021/acs.chemrev.6b00509 · Cited by 659
Revitalizing carbon supercapacitor electrodes with hierarchical porous structures
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Metadata
- Authors
- Kondrat, S., Georgi, N., Fedorov, M. V., & Kornyshev, A. A.
- Venue
- Physical Chemistry Chemical Physics
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2011
- Volume
- 13
- Issue
- 23
- Pages
- 11359
- ISSN
- 1463-9076 (ISSN-L)
- 1463-9084
- OpenAlex
- W1968235729
- Cited by
- 287
- References
- 0
- FWCI
- 9.46
- Type
- journal article
- Language
- en
- Open access
- closed
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- Kondrat, S., Georgi, N., Fedorov, M. V., & Kornyshev, A. A. (2011). A superionic state in nano-porous double-layer capacitors: insights from Monte Carlo simulations. Physical Chemistry Chemical Physics. https://doi.org/10.1039/c1cp20798a
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