Study on LiI and KI with low melting temperature for electrolyte replenishment in molten carbonate fuel cells

Jae Kwan Bae; Hyun Woo Kim; Grazia Accardo; Ghun Sik Kim; Hyung Chul Ham; Seong Cheol Jang; Yong Soo Cho; Sung Pil Yoon

doi:10.1016/j.ijhydene.2019.08.050

Study on LiI and KI with low melting temperature for electrolyte replenishment in molten carbonate fuel cells

Jae Kwan Bae, Hyun Woo Kim, Grazia Accardo, Ghun Sik Kim, Hyung Chul Ham, Seong Cheol Jang, Yong Soo Cho, Sung Pil Yoon

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Molten carbonate fuel cells (MCFCs) are regarded as the closest fuel cell to commercialization due to their high capacity and energy efficiency. However, they are operated at a high temperature (620 °C or higher), where liquid electrolyte loss occurs during operation; hence, their lifetime is limited. For the long-term operation of MCFCs, it is essential to develop a novel method to replenish the electrolyte during operation. However, it is very difficult to directly inject the electrolyte, (Li_0.62K_0.38)₂CO₃, into each unit cell of the stack unless it is supplemented through liquid or gas phase at low temperature. It was verified whether LiI and KI, which have low melting points and high vapor pressures, could replenish the lost electrolyte in MCFCs. In this study, the LiI and KI injected into the unit cell in liquid phase showed a similar tendency to the Li/K carbonate electrolyte. This is because LiI and KI react with the CO₂/O₂ gases supplied to the cathode during MCFC operation to form Li/K carbonate electrolytes.

Original language	English
Pages (from-to)	25930-25938
Number of pages	9
Journal	International Journal of Hydrogen Energy
Volume	44
Issue number	47
DOIs	https://doi.org/10.1016/j.ijhydene.2019.08.050
Publication status	Published - 2019 Oct 4

Bibliographical note

Funding Information:
This work was financially supported by the Energy Technology Program of Korea Institute of Energy Technology Evaluation and Planning (KETEP) ( 20163030031860 ) and the Ministry of Trade, Industry & Energy (MOTIE) of Korea and the Creative Materials Discovery Program by Ministry of Science and ICT ( 2018M3D1A1058536 ) and the KIST institutional program for the Korea Institute of Science and Technology ( 2E29610 ).

Publisher Copyright:
© 2019 Hydrogen Energy Publications LLC

All Science Journal Classification (ASJC) codes

Renewable Energy, Sustainability and the Environment
Fuel Technology
Condensed Matter Physics
Energy Engineering and Power Technology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.ijhydene.2019.08.050

Cite this

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title = "Study on LiI and KI with low melting temperature for electrolyte replenishment in molten carbonate fuel cells",

abstract = "Molten carbonate fuel cells (MCFCs) are regarded as the closest fuel cell to commercialization due to their high capacity and energy efficiency. However, they are operated at a high temperature (620 °C or higher), where liquid electrolyte loss occurs during operation; hence, their lifetime is limited. For the long-term operation of MCFCs, it is essential to develop a novel method to replenish the electrolyte during operation. However, it is very difficult to directly inject the electrolyte, (Li0.62K0.38)2CO3, into each unit cell of the stack unless it is supplemented through liquid or gas phase at low temperature. It was verified whether LiI and KI, which have low melting points and high vapor pressures, could replenish the lost electrolyte in MCFCs. In this study, the LiI and KI injected into the unit cell in liquid phase showed a similar tendency to the Li/K carbonate electrolyte. This is because LiI and KI react with the CO2/O2 gases supplied to the cathode during MCFC operation to form Li/K carbonate electrolytes.",

author = "Bae, {Jae Kwan} and Kim, {Hyun Woo} and Grazia Accardo and Kim, {Ghun Sik} and Ham, {Hyung Chul} and Jang, {Seong Cheol} and Cho, {Yong Soo} and Yoon, {Sung Pil}",

note = "Funding Information: This work was financially supported by the Energy Technology Program of Korea Institute of Energy Technology Evaluation and Planning (KETEP) ( 20163030031860 ) and the Ministry of Trade, Industry & Energy (MOTIE) of Korea and the Creative Materials Discovery Program by Ministry of Science and ICT ( 2018M3D1A1058536 ) and the KIST institutional program for the Korea Institute of Science and Technology ( 2E29610 ). Publisher Copyright: {\textcopyright} 2019 Hydrogen Energy Publications LLC",

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AU - Bae, Jae Kwan

AU - Kim, Hyun Woo

AU - Accardo, Grazia

AU - Kim, Ghun Sik

AU - Ham, Hyung Chul

AU - Jang, Seong Cheol

AU - Cho, Yong Soo

AU - Yoon, Sung Pil

N1 - Funding Information: This work was financially supported by the Energy Technology Program of Korea Institute of Energy Technology Evaluation and Planning (KETEP) ( 20163030031860 ) and the Ministry of Trade, Industry & Energy (MOTIE) of Korea and the Creative Materials Discovery Program by Ministry of Science and ICT ( 2018M3D1A1058536 ) and the KIST institutional program for the Korea Institute of Science and Technology ( 2E29610 ). Publisher Copyright: © 2019 Hydrogen Energy Publications LLC

PY - 2019/10/4

Y1 - 2019/10/4

N2 - Molten carbonate fuel cells (MCFCs) are regarded as the closest fuel cell to commercialization due to their high capacity and energy efficiency. However, they are operated at a high temperature (620 °C or higher), where liquid electrolyte loss occurs during operation; hence, their lifetime is limited. For the long-term operation of MCFCs, it is essential to develop a novel method to replenish the electrolyte during operation. However, it is very difficult to directly inject the electrolyte, (Li0.62K0.38)2CO3, into each unit cell of the stack unless it is supplemented through liquid or gas phase at low temperature. It was verified whether LiI and KI, which have low melting points and high vapor pressures, could replenish the lost electrolyte in MCFCs. In this study, the LiI and KI injected into the unit cell in liquid phase showed a similar tendency to the Li/K carbonate electrolyte. This is because LiI and KI react with the CO2/O2 gases supplied to the cathode during MCFC operation to form Li/K carbonate electrolytes.

AB - Molten carbonate fuel cells (MCFCs) are regarded as the closest fuel cell to commercialization due to their high capacity and energy efficiency. However, they are operated at a high temperature (620 °C or higher), where liquid electrolyte loss occurs during operation; hence, their lifetime is limited. For the long-term operation of MCFCs, it is essential to develop a novel method to replenish the electrolyte during operation. However, it is very difficult to directly inject the electrolyte, (Li0.62K0.38)2CO3, into each unit cell of the stack unless it is supplemented through liquid or gas phase at low temperature. It was verified whether LiI and KI, which have low melting points and high vapor pressures, could replenish the lost electrolyte in MCFCs. In this study, the LiI and KI injected into the unit cell in liquid phase showed a similar tendency to the Li/K carbonate electrolyte. This is because LiI and KI react with the CO2/O2 gases supplied to the cathode during MCFC operation to form Li/K carbonate electrolytes.

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Study on LiI and KI with low melting temperature for electrolyte replenishment in molten carbonate fuel cells

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

UN SDGs

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