Characterizations of polybenzimidazole based electrochemical hydrogen pumps with various Pt loadings for H2/CO2 gas separation

Title
Characterizations of polybenzimidazole based electrochemical hydrogen pumps with various Pt loadings for H2/CO2 gas separation
Authors
김수진이병석안상현한준영박희영김성현유성종김형준조은애헨켄스마이어디억남석우임태훈김수길허완수장종현
Keywords
Electrochemical hydrogen pump; Polybenzimidazole membranes; Gas separation; Carbon capture and storage; Electrochemical impedance spectroscopy
Issue Date
2013-11
Publisher
International journal of hydrogen energy
Citation
VOL 38, NO 34, 14816-14823
Abstract
Carbon capture and storage (CCS) technologies have been intensively researched and developed to cope with climate change, by reducing atmospheric CO2 concentration. The electrochemical hydrogen pumps with phosphoric acid doped polybenzimidazole (PBI) membrane are evaluated as a process to concentrate CO2 and produce pure H2 from anode outlet gases (H2/CO2 mixture) of molten carbonate fuel cells (MCFC). The PBI-based hydrogen pump without humidification (160 ℃) can provide higher hydrogen separation performances than the cells with perfluorosulfonic-acid membranes at a relative humidity of 43% (80 ℃), suggesting that the pre-treatment steps can be decreased for PBI-based systems. With the H2/CO2 mixture feed, the current efficiency for the hydrogen separation is very high, but the cell voltage increase, compared to the pure hydrogen operation, mainly due to the larger polarization resistance at electrodes, as confirmed by electrochemical impedance spectroscopy (EIS). The performance evaluation with various Pt loadings indicates that the hydrogen oxidation reaction at anodes is rate determining, and therefore the Pt loading at cathodes can be decreased from 1.1 mg/㎠ to 0.2 mg/㎠ without significant performance decay. The EIS analysis also confirms that the polarization resistances are largely dependent on the Pt loading in anodes.
URI
http://pubs.kist.re.kr/handle/201004/46223
ISSN
03603199
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KIST Publication > Article
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