Synthesis and decomposition mechanisms of ternary Mg2COH5 studied using in situ synchrotron X-ray diffraction

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Synthesis and decomposition mechanisms of ternary Mg2COH5 studied using in situ synchrotron X-ray diffraction. / Norek, M.; Nielsen, T. K.; Polanski, M.; Kunce, I.; Plocinski, T.; Jaroszewicz, L. R.; Cerenius, Yngve; Jensen, T. R.; Bystrzycki, J.

I: International Journal of Hydrogen Energy, Vol. 36, Nr. 17, 2011, s. 10760-10770.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Harvard

Norek, M, Nielsen, TK, Polanski, M, Kunce, I, Plocinski, T, Jaroszewicz, LR, Cerenius, Y, Jensen, TR & Bystrzycki, J 2011, 'Synthesis and decomposition mechanisms of ternary Mg2COH5 studied using in situ synchrotron X-ray diffraction', International Journal of Hydrogen Energy, vol. 36, nr. 17, s. 10760-10770. https://doi.org/10.1016/j.ijhydene.2011.05.126

APA

Norek, M., Nielsen, T. K., Polanski, M., Kunce, I., Plocinski, T., Jaroszewicz, L. R., ... Bystrzycki, J. (2011). Synthesis and decomposition mechanisms of ternary Mg2COH5 studied using in situ synchrotron X-ray diffraction. International Journal of Hydrogen Energy, 36(17), 10760-10770. https://doi.org/10.1016/j.ijhydene.2011.05.126

CBE

Norek M, Nielsen TK, Polanski M, Kunce I, Plocinski T, Jaroszewicz LR, Cerenius Y, Jensen TR, Bystrzycki J. 2011. Synthesis and decomposition mechanisms of ternary Mg2COH5 studied using in situ synchrotron X-ray diffraction. International Journal of Hydrogen Energy. 36(17):10760-10770. https://doi.org/10.1016/j.ijhydene.2011.05.126

MLA

Vancouver

Author

Norek, M. ; Nielsen, T. K. ; Polanski, M. ; Kunce, I. ; Plocinski, T. ; Jaroszewicz, L. R. ; Cerenius, Yngve ; Jensen, T. R. ; Bystrzycki, J. / Synthesis and decomposition mechanisms of ternary Mg2COH5 studied using in situ synchrotron X-ray diffraction. I: International Journal of Hydrogen Energy. 2011 ; Vol. 36, Nr. 17. s. 10760-10770.

RIS

TY - JOUR

T1 - Synthesis and decomposition mechanisms of ternary Mg2COH5 studied using in situ synchrotron X-ray diffraction

AU - Norek, M.

AU - Nielsen, T. K.

AU - Polanski, M.

AU - Kunce, I.

AU - Plocinski, T.

AU - Jaroszewicz, L. R.

AU - Cerenius, Yngve

AU - Jensen, T. R.

AU - Bystrzycki, J.

PY - 2011

Y1 - 2011

N2 - A ternary Mg2COH5 hydride was synthesized using a novel method that relies on a relatively short mechanical milling time (1 h) of a 2:1 MgH2-Co powder mixture followed by sintering at a sufficiently high hydrogen pressure (>85 bar) and heating from RT to 500 degrees C. The ternary hydride forms in less than 2.5 h (including the milling time) with a yield of similar to 90% at similar to 300 degrees C. The mechanisms of formation and decomposition of ternary Mg2COH5 were studied in detail using an in situ synchrotron radiation powder X-ray diffraction (SR-PXD). The obtained experimental results are supported by morphological and microstructural investigations performed using SEM and high-resolution STEM. Additionally, thermal effects occurring during the desorption reaction were studied using DSC. The morphology of as-prepared ternary Mg2COH5 is characterized by the presence of porous particles with various shapes and sizes, which, in fact, are a type of nanocomposite consisting mainly of nanocrystallites with a size of similar to 5 nm. Mg2COH5 decomposes at approximately 300 degrees C to elemental Mg and Co. Additionally, at approximately 400 degrees C, MgCo is formed as precipitates inserted into the Mg Co matrix. During the rehydrogenation of the decomposed residues, prior to the formation of Mg2COH5, MgH2 appears, which confirms its key role in the synthesis of the ternary Mg2COH5. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

AB - A ternary Mg2COH5 hydride was synthesized using a novel method that relies on a relatively short mechanical milling time (1 h) of a 2:1 MgH2-Co powder mixture followed by sintering at a sufficiently high hydrogen pressure (>85 bar) and heating from RT to 500 degrees C. The ternary hydride forms in less than 2.5 h (including the milling time) with a yield of similar to 90% at similar to 300 degrees C. The mechanisms of formation and decomposition of ternary Mg2COH5 were studied in detail using an in situ synchrotron radiation powder X-ray diffraction (SR-PXD). The obtained experimental results are supported by morphological and microstructural investigations performed using SEM and high-resolution STEM. Additionally, thermal effects occurring during the desorption reaction were studied using DSC. The morphology of as-prepared ternary Mg2COH5 is characterized by the presence of porous particles with various shapes and sizes, which, in fact, are a type of nanocomposite consisting mainly of nanocrystallites with a size of similar to 5 nm. Mg2COH5 decomposes at approximately 300 degrees C to elemental Mg and Co. Additionally, at approximately 400 degrees C, MgCo is formed as precipitates inserted into the Mg Co matrix. During the rehydrogenation of the decomposed residues, prior to the formation of Mg2COH5, MgH2 appears, which confirms its key role in the synthesis of the ternary Mg2COH5. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

KW - Magnesium-cobalt hydride

KW - Synthesis

KW - Mechanical milling

KW - In situ

KW - SR-PXD

KW - Microstructure

U2 - 10.1016/j.ijhydene.2011.05.126

DO - 10.1016/j.ijhydene.2011.05.126

M3 - Article

VL - 36

SP - 10760

EP - 10770

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 1879-3487

IS - 17

ER -