Enhancement of cell performance using a gadolinium strontium cobaltite coated cathode in molten carbonate fuel cells

Song, Shin Ae; Jang, Seong Cheol; Han, Jonghee; Yoon, Sung Pil; Nam, Suk Woo; Oh, In Hwan; Lim, Tae Hoon

doi:10.1016/j.jpowsour.2011.08.032

Cited by 18 publications

(10 citation statements)

References 31 publications

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“…LSCF and GSC are known to dissociate oxygen molecules readily because they have many oxygen vacancies. Accordingly, our results indicate that coating the cathode with LSCF or GSC catalysts dramatically reduces cathode polarization [13,14]. Ag is also known as an effective catalyst for O 2 adsorption and dissociation; therefore, coating Ag on the cathode also enhances the cell performance [15].…”

Section: Introductionmentioning

confidence: 58%

“…In our previous study [13][14][15], we tested different catalyst-coated cathodes including GSC-, LSCF-, and Ag-coated cathodes. The current density-voltage (J-V) curves of the single cells using these cathodes are presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The performances of the Cu-coated cathode and uncoated conventional cathode were evaluated and compared in a single cell with an active electrode area of 100 cm 2 . Except for the cathodes, the cells were identical in their components and included a Ni-Al anode, Li/K carbonate electrolyte, and LiAlO 2 matrix, as described in our previous publications [13][14][15][16]. The single cells were operated at 620 o C. The gas compositions in the cathode and anode were air:CO 2 = 7:3 and H 2 :H 2 O:CO 2 = 72:18:10, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…If a catalyst that enables easy dissociation of the O-O bond can be developed, the rate of ORR can be improved, even at lower temperatures and the cell performance can be enhanced. To enhance the cathode performance, we studied cathodes coated with catalysts such as lanthanum strontium cobalt ferrite (LSCF) [13], gadolinium strontium cobaltite (GSC) [14], and Ag [15]. LSCF and GSC are known to dissociate oxygen molecules readily because they have many oxygen vacancies.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Catalytic Behavior of Cu2O Catalyst for Oxygen Reduction Reaction in Molten Carbonate Fuel Cells

Song

Kim

Lim

et al. 2018

J. Electrochem. Sci. Technol

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To enhance the performance of cathodes at low temperatures, a Cu-coated cathode is prepared, and its electrochemical performance is examined by testing its use in a single cell. At 620 o C and a current density of 150 mAcm-2 , a single cell containing the Cu-coated cathode has a significantly higher voltage (0.87 V) during the initial operation than does that with an uncoated cathode (0.79 V). According to EIS analysis, the high voltage of the cell with the Cu-coated cathode is due to the dramatic decrease in the high-frequency resistance related to electrochemical reactions. From XPS analysis, it is confirmed that the Cu is initially in the form of Cu 2 O and is converted into CuO after 150 h of operation, without any change in the state of the Ni or Li. Therefore, the high initial cell voltage is confirmed to be due to Cu 2 O. Because Cu 2 O is catalytically active toward O 2 adsorption and dissociation, Cu 2 O on a NiO cathode enhances cell performance and reduces cathode polarization. However, the cell with the Cu-coated cathode does not maintain its high voltage because Cu 2 O is oxidized to CuO, which demonstrates similar catalytic activity toward O 2 as NiO.

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Section: Introductionmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical Catalytic Behavior of Cu2O Catalyst for Oxygen Reduction Reaction in Molten Carbonate Fuel Cells

Song

Kim

Lim

et al. 2018

J. Electrochem. Sci. Technol

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“…Many attempts have been made to accomplish this; for instance, coating the cathode with noble metal (silver) 11 or mixed ionic electronic conductors (MIECs) (for example LSCF, LSC, GSC). 12,13 However, it seems that the performance of the coated cells is not high or equivalent to standard cells, even though good MIEC materials were used as a coating, especially at low operating temperatures less than 600…”

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confidence: 99%

A New Cathode for Reduced-Temperature Molten Carbonate Fuel Cells

Nguyen

Kang

Ham

et al. 2014

J. Electrochem. Soc.

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Oxygen solubility is the rate-determining step (RDS) for the reduction reaction on the cathodes of molten carbonate fuel cells (MCFCs), especially at low operating temperatures below 600 • C. The poor wetting property of the mixed ionic and electronic conductor (MIEC) coating, such as BYS (Bi 1.5 Y 0.3 Sm 0.2 O 3-δ ) on the NiO cathode, to the liquid electrolyte creates openings where oxygen absorption and dissociation take place to provide more oxide ionic species to electrochemical reaction sites (ERSs). Therefore, poor wetting MIEC-coated cells showed a much higher power density compared to standard cells, with a factor of 1.4 at the low operating temperature of 550 • C. Long-term operation of 2500 hours with a low voltage loss of 9 mV suggests that BYS is a promising alternative cathode material for molten carbonate fuel cells.

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