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AB(5)-type hydrogen storage alloys as catalysts in hydrogen-diffusion electrodes for novel H-2/hydride//perovskite/O-2 alkaline fuel cells
KTH, Superseded Departments, Chemical Engineering and Technology.ORCID iD: 0000-0002-6212-4194
2004 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 108, no 48, 18530-18534 p.Article in journal (Refereed) Published
Abstract [en]

Development of a non-noble-metal catalyst electrode is an important issue in the research and development of fuel cells. The catalytic activity and durability of AB(5)-type hydrogen storage alloys used in hydrogen-diffusion electrodes for alkaline fuel cells are evaluated. The experiments demonstrate that the activity and stability for hydrogen oxidation is greatly improved if the particle size is decreased from 5-30 to 1-10 mum. This also improves the electrode stability. SEM and XRD analyses show that no disintegration of the smaller catalyst particles is observed in long-term tests. A novel H-2/hydride//perovskite/O-2 alkaline fuel cell was constructed as a non-noble-metal fuel cell concept. The results showed that both gas-diffusion electrodes had high catalytic activities and good stability. A maximum power density of 54 mW/cm(2) was achieved at 120 mA/cm(2) when using H-2/O-2 and 49 mW/cm(2) at 100 mA/cm(2) when using H-2/air.

Place, publisher, year, edition, pages
2004. Vol. 108, no 48, 18530-18534 p.
Keyword [en]
co, surface, single
Identifiers
URN: urn:nbn:se:kth:diva-23917DOI: 10.1021/jp047620xISI: 000225417200021Scopus ID: 2-s2.0-10444232882OAI: oai:DiVA.org:kth-23917DiVA: diva2:342616
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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Kiros, Yohannes

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