Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 925, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2022.116896
Keywords
Molten carbonate; Fuel cell; Electrolysis cell; Overpotential; Gas phase; Mass transfer
Categories
Funding
- New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry and Energy, Republic of Korea [20213030040080]
- Korea Institute of Energy Technology Evaluation & Planning (KETEP) [20213030040080] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The gas-phase mass transfer effects of 100 cm2 class molten carbonate cells (MCCs) were investigated in both fuel cell (FC) and electrolysis cell (EC) modes. The results showed that there were no activation polarization in both modes and the hydrogen electrode (HE) had significant gas-phase mass transfer resistance. The overpotential shift pattern of HE by flow rate change was symmetric in both modes. On the other hand, a small gas-phase mass transfer inducing overpotential was observed at the oxygen electrode (OE) in the FC mode compared to the HE, while there was no gas-phase mass transfer-induced overpotential in the EC mode. Therefore, the EC mode of MCCs comprises mainly gas-phase mass transfer controlling processes at HE and negligible at OE. It can be inferred that reversible operation in both modes is possible, and the reaction mechanisms are symmetrical between FC and EC modes.
The gas-phase mass transfer effects of 100 cm2 class molten carbonate cells (MCCs) were investigated in both the fuel cell and electrolysis modes using steady-state polarization (SSP) and inert-gas step addition (ISA) meth-ods. The SSP results showed symmetric and linear behaviours between fuel cell (FC) and electrolysis cell (EC) modes without showing activation polarization in both modes. The ISA results showed that the hydrogen elec-trode (HE) has significant gas-phase mass transfer resistance in both modes, and the overpotential shift pattern of HE by the flow rate change is symmetric in both modes. On the contrary, a small gas-phase mass transfer inducing overpotential was observed at the OE in the FC mode compared to the HE, while there was no gas-phase mass transfer-induced overpotential in the EC mode. Therefore, the EC mode of MCCs comprises mainly gas-phase mass transfer controlling processes at HE and negligible at OE. In addition, it can be inferred that reversible operation in both modes is possible, and the reaction mechanisms are symmetrical between FC and EC modes.
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