Water and protons in electrodeposited MnO₂ (EMD)

Title: Water and protons in electrodeposited MnO₂ (EMD)
Creator: Donne, Scott W.; Feddrix, Frank H.; Glockner, Ronny; Marion, Stefan; Norby, Truls
Relation: Solid State Ionics Vol. 152-153, p. 695-701
Publisher Link: http://dx.doi.org/10.1016/S0167-2738(02)00411-3
Publisher: Elsevier Science BV
Resource Type: journal article
Date: 2002
Description: A set of solid/gas techniques have been applied to study protons and proton transport in electrodeposited MnO₂ (EMD) which is used in battery cathodes. The concentration of protons has been measured to be 0.4–0.5 mol H⁺ per mol MnO₂ at 24°C and pH₂O=0.022 atm by in situ proton–deuteron exchange using heavy water vapour in a thermobalance. The proton content has furthermore been mapped versus T and pH₂O, and it appears that about half of the protons are present in water loosely adsorbed in microporosity in the EMD. Electrical conductivity and transport number measurements show that EMD is mainly an electronic conductor, while a minor proton conductivity, probably mediated by the adsorbed water, increases strongly with decreasing temperature and increasing pH₂O and is around 1% of the total conductivity at ambient, humid conditions.
Subject: EMD; manganese dioxide; MnO₂; protons; proton conductivity
Identifier: http://hdl.handle.net/1959.13/33926
Identifier: uon:3386
Identifier: ISSN:0167-2738
Language: eng
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