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Improved NiMH performance by a surface treatment that creates magnetic Ni-clusters
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Number of Authors: 4
2016 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 41, no 23, 9933-9938 p.Article in journal (Refereed) Published
Abstract [en]

A surface treatment method has been developed to activate the surface of an AB(5) type (La-20 Ce-7 Pr-1 Nd-4 Al-2 Mn-5 Co-6 Ni-55) alloy. In the process the surface is covered with a porous surface layer containing needle shaped rare earth hydroxides after etching by a potassium hydroxide solution. TEM studies show in addition the presence of a denser surface oxide layer with embedded Ni containing clusters covering the bulk alloy. The magnetic properties of the alloy powders change with the surface treatment. In addition to a paramagnetic component of the bulk alloy, surface treated alloy also displays superparamagnetic and ferromagnetic properties. In electrochemical half-cell tests, the alloy shows better high-rate dischargeability with increasing presence of magnetic clusters in the metal hydride particles surface.

Place, publisher, year, edition, pages
2016. Vol. 41, no 23, 9933-9938 p.
Keyword [en]
Metal hydrides, NiMH batteries, Surface treatment, Ni clusters, Discharge kinetics, Rare earths hydroxides
National Category
Chemical Sciences Environmental Engineering
Identifiers
URN: urn:nbn:se:su:diva-132397DOI: 10.1016/j.ijhydene.2016.01.145ISI: 000378359400029OAI: oai:DiVA.org:su-132397DiVA: diva2:952570
Conference
1st International Symposium on Materials for Energy Storage and Conversion (ESC-IS), Middle East Technical University, Ankara, Turkey, September 07-09, 2015
Available from: 2016-08-15 Created: 2016-08-11 Last updated: 2016-08-15Bibliographically approved

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Shen, YangPeng, FeiNoréus, Dag
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Department of Materials and Environmental Chemistry (MMK)
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