Ammonium ion diffusion in the superprotonic phase of (NH4)3H(SO4)2 as studied by 1H spin-lattice relaxation times in the rotating frame

Omi, Hironori; Suzuki, K.; Hayashi, Shigenobu

doi:10.1016/j.ssi.2007.12.002

Cited by 4 publications

(1 citation statement)

References 21 publications

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“…These results indicate that the conduction mechanism of the ion-exchanger heated at 700 ºC was the same with that of the ion-exchanger heated at 800 ºC and might be NH 4 + ion migration in the interlayer, while that of the ion-exchanger heated at 900 ºC was proton migration. Omi et al reported that the activation energy for the translational diffusion of acidic proton in (NH 4 ) 3 H(SO 4 ) 2 was smaller than that for the translational diffusion of NH 4 + ion [17]. This report supports our consideration.…”

Section: Ionic Conductivities Of Nh 4 + Ion-exchanger During Heatingsupporting

confidence: 90%

Thermal transformation and ionic conductivity of ammonium ion-exchanger prepared from Na-4-mica

Taruta

Kaga

Yamaguchi

et al. 2010

Materials Science and Engineering: B

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Ammonium ion exchange of Na-4-mica and thermal transformation of the ion-exchanger were investigated and the conductivities of the heated ion-exchangers were estimated. More than 95.4 % of Na + ions in the interlayer of the Na-4-mica could be substituted by NH 4 + ions after repeating ion exchange four times. Almost of NH 4 + ions remained in the interlayer at 700 ºC and they were completely decomposed into protons at 900 ºC. The conductivities of the ion-exchangers heated at 700-900 ºC were 10 -7 -10 -6 S/cm at 700 ºC. The conduction mechanism of the ion-exchangers heated at 700 ºC and 800 ºC was NH 4 + ion migration in the interlayer and that of the ion-exchanger heated at 900 ºC was proton migration. However, the contribution of residual Na + ions to the conduction can not be excluded.

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Section: Ionic Conductivities Of Nh 4 + Ion-exchanger During Heatingsupporting

confidence: 90%

Thermal transformation and ionic conductivity of ammonium ion-exchanger prepared from Na-4-mica

Taruta

Kaga

Yamaguchi

et al. 2010

Materials Science and Engineering: B

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Diffusion of ammonium ions in [(NH4)1−xRbx]3H(SO4)2 studied by 1H spin–lattice relaxation in the rotating frame

Hayashi

Omi

2012

Journal of Physics and Chemistry of Solids

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Proton-conducting electrolytes for direct methanol and direct urea fuel cells – A state-of-the-art review

Radenahmad

Afif

Petra

et al. 2016

Renewable and Sustainable Energy Reviews

167

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Ammonium ion diffusion in the superprotonic phase of (NH4)3H(SO4)2 as studied by 1H spin-lattice relaxation times in the rotating frame

Cited by 4 publications

References 21 publications

Thermal transformation and ionic conductivity of ammonium ion-exchanger prepared from Na-4-mica

Thermal transformation and ionic conductivity of ammonium ion-exchanger prepared from Na-4-mica

Diffusion of ammonium ions in [(NH4)1−xRbx]3H(SO4)2 studied by 1H spin–lattice relaxation in the rotating frame

Proton-conducting electrolytes for direct methanol and direct urea fuel cells – A state-of-the-art review

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