Design of ternary Al-Sn-Fe alloy for fast on-board hydrogen production, and its application to PEM fuel cell

Authors
Eom, KwangSupKim, MinJoongOh, SeKwonCho, EunAeKwon, HyukSang
Issue Date
2011-09
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.36, no.18, pp.11825 - 11831
Abstract
An Al-Sn-Fe alloy is designed to increase the hydrogen generation rate even in weak alkaline water through the effective removal of Al oxide. Al-1wt.%Sn-1wt.%Fe alloy exhibits the hydrogen generation rate about 6 times higher than pure Al and 1.6 times higher than Al-1wt.%Fe alloy. Increases in exchange current density of Al alloys are in good accordance with increases in hydrogen generation rate. The addition of Sn in Al-Fe alloy can increase the hydrolysis rate by accelerating the breakdown of passive film (Al(OH)(3) and Al2O3) in an alkaline solution. Hence, the Al-1wt.%Sn-1wt%Fe alloy shows a much higher hydrogen generation rate than pure Al and Al-1wt.%Fe alloy in relatively weak alkaline water. In the hydrolysis of Al-1wt.%Sn-1wt%Fe, Fe accelerates the hydrogen production by inducing simultaneously both inter-granular and galvanic corrosion, whereas Sn increases the hydrogen generation rate by breaking the Al oxide down effectively. Based on the increase in the hydrogen generation rate of Al-1wt.%Fe and Al-1wt.%Sn-1wt%Fe alloys over pure Al, the contribution to the increase of Fe and Sn are calculated to be 63% and 27%, respectively. Because the same amount of power is obtained by PEMFC using 6 times less Al-Sn-Fe alloy than pure Al, the weight and volume of on-board hydrogen production reactor can be reduced significantly by alloying Al with a small amount of Fe and Sn. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Keywords
CATHODIC POLARIZATION; ALUMINUM-ALLOYS; GENERATION; CATHODIC POLARIZATION; ALUMINUM-ALLOYS; GENERATION; Aluminum; Al-Sn-Fe alloy; Hydrogen generation; Hydrolysis; On-board hydrogen production; PEMFC
ISSN
0360-3199
URI
https://pubs.kist.re.kr/handle/201004/130035
DOI
10.1016/j.ijhydene.2011.06.072
Appears in Collections:
KIST Article > 2011
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