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Characterizations of polybenzimidazole based electrochemical hydrogen pumps with various Pt loadings for H-2/CO2 gas separation

Authors
Kim, Soo JinLee, Byung-SeokAhn, Sang HyunHan, Jun YoungPark, Hee YoungKim, Sung HyunYoo, Sung JongKim, Hyoung-JuhnCho, EunAeHenkensmeier, DirkNam, Suk WooLim, Tae-HoonKim, Soo-KilHuh, WansooJang, Jong Hyun
Issue Date
13-Nov-2013
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Electrochemical hydrogen pump; Polybenzimidazole membranes; Gas separation; Carbon capture and storage; Electrochemical impedance spectroscopy
Citation
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.38, no.34, pp.14816 - 14823
Indexed
SCIE
SCOPUS
Journal Title
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume
38
Number
34
Start Page
14816
End Page
14823
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/101614
DOI
10.1016/j.ijhydene.2013.08.142
ISSN
0360-3199
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 (FBI) membrane are evaluated as a process to concentrate CO2 and produce pure H-2 from anode outlet gases (H-2/CO2 mixture) of molten carbonate fuel cells MCFC. The FBI-based hydrogen pump without humidification (160 degrees C) can provide higher hydrogen separation performances than the cells with perfluorosulfonic-acid membranes at a relative humidity of 43% (80 degrees C), suggesting that the pre-treatment steps can be decreased for PBI-based systems. With the H-2/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/cm(2) to 0.2 mg/cm(2) without significant performance decay. The EIS analysis also confirms that the polarization resistances are largely dependent on the Pt loading in anodes. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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College of Engineering > Department of Chemical and Biological Engineering > 1. Journal Articles
Graduate School > GREEN SCHOOL (Graduate School of Energy and Environment) > 1. Journal Articles

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