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In situ neutron diffraction of NaAlD4/carbon black composites during decomposition/deuteration cycles and the effect of carbon on phase segregation
KTH, School of Engineering Sciences (SCI), Applied Physics.ORCID iD: 0000-0002-1129-9234
Univ Tartu, Inst Chem, Ravila 14a, EE-50411 Tartu, Estonia..
KTH, School of Engineering Sciences (SCI), Applied Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics.ORCID iD: 0000-0003-4441-8882
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2022 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 47, no 80, p. 34195-34204Article in journal (Refereed) Published
Abstract [en]

The influence on the decomposition and reforming of the hydrogen storage material NaAlH4 by adding relatively low amounts of mesoporous carbon black is investigated with in situ diffraction. A 60:40 NaAlH4/carbon black composite is prepared via ball milling and characterised ex situ via X-ray diffraction, gas adsorption, temperature-programmed decomposition, and dehydrogenation/hydrogenation cycling methods. The prepared composite is deuterated, and the crystalline phase composition is determined with in situ neutron powder diffraction method during multiple decomposition/deuteration cycles. Changes in the crystalline phase composition start slightly below the melting temperature of the pristine alanate, whereas the release of deuterium starts at considerably lower temperatures. The decomposition of Na3AlD6 to NaD is almost completely reversible at the applied low deuterium pressures of >= 2 MPa. Thus, the strong effect of even low concen-trations of a mesoporous carbon black on the capability to store H2 reversibly is showcased and analysed in-depth.

Place, publisher, year, edition, pages
Elsevier BV , 2022. Vol. 47, no 80, p. 34195-34204
Keywords [en]
Solid-stateH2 storage, Complex metal hydride, In situ neutron powder diffraction, Phase composition
National Category
Energy Engineering Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-321035DOI: 10.1016/j.ijhydene.2022.08.019ISI: 000872534500001Scopus ID: 2-s2.0-85136726217OAI: oai:DiVA.org:kth-321035DiVA, id: diva2:1708600
Note

QC 20221104

Available from: 2022-11-04 Created: 2022-11-04 Last updated: 2024-03-15Bibliographically approved

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Palm, RasmusElson, FrankNocerino, ElisabettaForslund, Ola KenjiMånsson, Martin

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Palm, RasmusElson, FrankNocerino, ElisabettaForslund, Ola KenjiMånsson, Martin
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