Transport properties in molten carbonates: self-diffusion and conductivity measurements at high temperature

A better understanding and use of molten carbonate fuel cells (MCFCs) requires more detailed consideration on transport properties in melt. The combination of different methodological developments can be one solution to improve our comprehension. Here we present 23Na and 7Li self-diffusion coefficie...

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Bibliographic Details
Published in:International journal of hydrogen energy 2021-04, Vol.46 (28), p.15059-15065
Main Authors: Zhadan, A., Sarou-Kanian, V., Del Campo, L., Cosson, L., Malki, M., Bessada, C.
Format: Article
Language:English
Subjects:
Chemical Sciences
CO2
Electrical conductivity
High temperature
Material chemistry
Molten carbonates
PFG NMR
Self-diffusion
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Summary:A better understanding and use of molten carbonate fuel cells (MCFCs) requires more detailed consideration on transport properties in melt. The combination of different methodological developments can be one solution to improve our comprehension. Here we present 23Na and 7Li self-diffusion coefficients measured by pulsed field gradient (PFG) NMR technique combined with electrical conductivity obtained by a 4-electrode set up, in the eutectic mixture Li2CO3–Na2CO3 (52:48 %mol) at high temperature (up to 1050 K), and under pure CO2 atmosphere. The results were compared with known experimental data from literature obtained by radiotracers techniques and 2-electrode set up and also with some calculations of the transport properties. •Molten Li2CO3–Na2CO3 eutectic mixture.•Electrical conductivity and self-diffusion coefficients at high temperature.•Results are presented and discussed.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2020.06.294