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Improved NiMH performance by a surface treatment that creates magnetic Ni-clusters
Stockholm Univ, Dept Mat & Environm Chem, SE-10691 Stockholm, Sweden..
Stockholm Univ, Dept Mat & Environm Chem, SE-10691 Stockholm, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Stockholm Univ, Dept Mat & Environm Chem, SE-10691 Stockholm, Sweden..
2016 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 41, no 23, p. 9933-9938Article in journal, Meeting abstract (Refereed) Published
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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, p. 9933-9938
Keyword [en]
Metal hydrides, NiMH batteries, Surface treatment, Ni clusters, Discharge kinetics, Rare earths hydroxides
National Category
Other Physics Topics Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-299714DOI: 10.1016/j.ijhydene.2016.01.145ISI: 000378359400029OAI: oai:DiVA.org:uu-299714DiVA, id: diva2:950015
Conference
1st International Symposium on Materials for Energy Storage and Conversion (ESC-IS), SEP 07-09, 2015, Middle E Tech Univ, Ankara, TURKEY
Available from: 2016-07-26 Created: 2016-07-26 Last updated: 2017-11-28Bibliographically approved

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