Effect of Cs2CO3 in Li/K and Li/Na carbonate on the oxygen reduction reaction for MCFC

Min Goo Kang; Hyun S. Park; Hyung Chul Ham; Seong Cheol Jang; Chang Won Yoon; Jonghee Han; Suk Woo Nam; Sung Hyun Kim; Sung Pil Yoon

doi:10.1149/2.0061609jes

Effect of Cs₂CO₃ in Li/K and Li/Na carbonate on the oxygen reduction reaction for MCFC

Min Goo Kang, Hyun S. Park, Hyung Chul Ham, Seong Cheol Jang, Chang Won Yoon, Jonghee Han, Suk Woo Nam, Sung Hyun Kim, Sung Pil Yoon

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

3 Citations (Scopus)

Abstract

Electrolyte properties are significantly important for the long-term stability and performance ofmolten carbonate fuel cells (MCFCs). The Li/Na carbonate is considered an attractive electrolyte for MCFCs due to its high ionic conductivity and low volatility. However, low oxygen solubility is a serious drawback in Li/Na carbonate electrolytes, which hinders the oxygen reduction reaction (ORR) at theMCFC cathode. Several additives have been found to enhance the oxygen solubility in alkali carbonate electrolytes. In this study, the effect of Cs₂CO₃ in Li/Na and Li/K carbonate mixtures was investigated by cyclic voltammetry and electrochemical impedance spectroscopy. The oxygen reduction activity improved with the increasing Cs concentration (1, 3, and 5 mol%) in all the studied carbonate melts. The addition of Cs₂CO₃ (5 mol%) to the Li/Na carbonate (68.0/32.0) resulted in an approximately 30% increase of the mass transfer parameter (C₀ D₀) of the dissolved oxygen species from 0.99 × 10^-9 to 1.29 × 10^-9 mol/cm² s^1/2 at 620°C. The changes in the ionic conductivity of the molten electrolytes with the Cs additive were also studied.

Original language	English
Pages (from-to)	F962-F967
Journal	Journal of the Electrochemical Society
Volume	163
Issue number	8
DOIs	https://doi.org/10.1149/2.0061609jes
Publication status	Published - 2016

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

UN SDGs

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

Access to Document

10.1149/2.0061609jes

Cite this

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title = "Effect of Cs2CO3 in Li/K and Li/Na carbonate on the oxygen reduction reaction for MCFC",

abstract = "Electrolyte properties are significantly important for the long-term stability and performance ofmolten carbonate fuel cells (MCFCs). The Li/Na carbonate is considered an attractive electrolyte for MCFCs due to its high ionic conductivity and low volatility. However, low oxygen solubility is a serious drawback in Li/Na carbonate electrolytes, which hinders the oxygen reduction reaction (ORR) at theMCFC cathode. Several additives have been found to enhance the oxygen solubility in alkali carbonate electrolytes. In this study, the effect of Cs2CO3 in Li/Na and Li/K carbonate mixtures was investigated by cyclic voltammetry and electrochemical impedance spectroscopy. The oxygen reduction activity improved with the increasing Cs concentration (1, 3, and 5 mol%) in all the studied carbonate melts. The addition of Cs2CO3 (5 mol%) to the Li/Na carbonate (68.0/32.0) resulted in an approximately 30% increase of the mass transfer parameter (C0 D0) of the dissolved oxygen species from 0.99 × 10-9 to 1.29 × 10-9 mol/cm2 s1/2 at 620°C. The changes in the ionic conductivity of the molten electrolytes with the Cs additive were also studied.",

author = "Kang, {Min Goo} and Park, {Hyun S.} and Ham, {Hyung Chul} and Jang, {Seong Cheol} and Yoon, {Chang Won} and Jonghee Han and Nam, {Suk Woo} and Kim, {Sung Hyun} and Yoon, {Sung Pil}",

note = "Funding Information: This work was financially supported by the Global Research Laboratory (GRL) Program of the National Research Foundation of Korea (NRF) (2U04910) and the Institutional Program of the Korea Institute of Science and Technology (2E26590). Publisher Copyright: {\textcopyright} 2016 The Electrochemical Society. All rights reserved. Copyright: Copyright 2016 Elsevier B.V., All rights reserved.",

year = "2016",

doi = "10.1149/2.0061609jes",

language = "English",

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T1 - Effect of Cs2CO3 in Li/K and Li/Na carbonate on the oxygen reduction reaction for MCFC

AU - Kang, Min Goo

AU - Park, Hyun S.

AU - Ham, Hyung Chul

AU - Jang, Seong Cheol

AU - Yoon, Chang Won

AU - Han, Jonghee

AU - Nam, Suk Woo

AU - Kim, Sung Hyun

AU - Yoon, Sung Pil

N1 - Funding Information: This work was financially supported by the Global Research Laboratory (GRL) Program of the National Research Foundation of Korea (NRF) (2U04910) and the Institutional Program of the Korea Institute of Science and Technology (2E26590). Publisher Copyright: © 2016 The Electrochemical Society. All rights reserved. Copyright: Copyright 2016 Elsevier B.V., All rights reserved.

PY - 2016

Y1 - 2016

N2 - Electrolyte properties are significantly important for the long-term stability and performance ofmolten carbonate fuel cells (MCFCs). The Li/Na carbonate is considered an attractive electrolyte for MCFCs due to its high ionic conductivity and low volatility. However, low oxygen solubility is a serious drawback in Li/Na carbonate electrolytes, which hinders the oxygen reduction reaction (ORR) at theMCFC cathode. Several additives have been found to enhance the oxygen solubility in alkali carbonate electrolytes. In this study, the effect of Cs2CO3 in Li/Na and Li/K carbonate mixtures was investigated by cyclic voltammetry and electrochemical impedance spectroscopy. The oxygen reduction activity improved with the increasing Cs concentration (1, 3, and 5 mol%) in all the studied carbonate melts. The addition of Cs2CO3 (5 mol%) to the Li/Na carbonate (68.0/32.0) resulted in an approximately 30% increase of the mass transfer parameter (C0 D0) of the dissolved oxygen species from 0.99 × 10-9 to 1.29 × 10-9 mol/cm2 s1/2 at 620°C. The changes in the ionic conductivity of the molten electrolytes with the Cs additive were also studied.

AB - Electrolyte properties are significantly important for the long-term stability and performance ofmolten carbonate fuel cells (MCFCs). The Li/Na carbonate is considered an attractive electrolyte for MCFCs due to its high ionic conductivity and low volatility. However, low oxygen solubility is a serious drawback in Li/Na carbonate electrolytes, which hinders the oxygen reduction reaction (ORR) at theMCFC cathode. Several additives have been found to enhance the oxygen solubility in alkali carbonate electrolytes. In this study, the effect of Cs2CO3 in Li/Na and Li/K carbonate mixtures was investigated by cyclic voltammetry and electrochemical impedance spectroscopy. The oxygen reduction activity improved with the increasing Cs concentration (1, 3, and 5 mol%) in all the studied carbonate melts. The addition of Cs2CO3 (5 mol%) to the Li/Na carbonate (68.0/32.0) resulted in an approximately 30% increase of the mass transfer parameter (C0 D0) of the dissolved oxygen species from 0.99 × 10-9 to 1.29 × 10-9 mol/cm2 s1/2 at 620°C. The changes in the ionic conductivity of the molten electrolytes with the Cs additive were also studied.

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