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Variation of the MnO2 Birnessite Structure upon Charge/Discharge in an Electrochemical Supercapacitor Electrode in Aqueous Na2SO4 Electrolyte
Abstract
This paper provides new insight on the charge storage mechanism in crystallized Mg-doped sodium birnessite-type manganese dioxide used as active supercapacitor electrode material that involves the intercalation/deintercalation of cations between the sheets during electrochemical reduction/oxidation, respectively. An increase of the interlayer spacing from 0.710 to 0.720 nm upon electrochemical oxidation in the presence of Na + cations in the electrolyte is associated with the deintercalation of Na + and the intercalation of H 2 O between the layers. A progressive crystallinity loss of the material is also observed upon potential cycling between the oxidized and reduced states. Despite these structural changes, the birnessite electrode exhibits a stable capacitance of 145 F/g over 1100 cycles.
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Citations
Cites
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Metadata
- Authors
- Athouël, L., Moser, F., Dugas, R., Crosnier, O., Bélanger, D., & Brousse, T.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2008-04-11
- Volume
- 112
- Issue
- 18
- Pages
- 7270-7277
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2084613743
- Cited by
- 362
- References
- 1
- FWCI
- 8.61
- Type
- journal article
- Language
- en
- Open access
- closed
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