Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 42, Issue 47, Pages 28453-28463Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2017.09.095
Keywords
Thermal storage; Catalysis; Atomised; Hydrogen; Magnesium; Magnetron sputtering
Categories
Funding
- Engineering and Physical Sciences Research Council [EP/K021117/1, EP/N509851/1]
- Teer Coatings Ltd, Miba Coating Group and Innovate UK [TP 5361-4461]
- Engineering and Physical Sciences Research Council [EP/R00143X/1, EP/N509851/1, EP/K021117/1] Funding Source: researchfish
- EPSRC [EP/K021117/1, EP/R00143X/1, EP/N509851/1] Funding Source: UKRI
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Elevated temperature cycling studies were performed on two commercial gas atomised Mg spherical powders (average diameter of 26 mu m and 30 mu m) with magnetron sputtered catalysts (chromium, iron, vanadium and stainless steel) applied to their surfaces. At 350 degrees C, the presence of a catalyst promotes faster reaction kinetics with improving capacity until approaching stabilisation by the 90th cycle, e.g. the normalised capacity of V_Mg30 was found to rise from 45.5% to 65.5%. Following determination of activation energies (from Kissinger plots) and microstructural analysis of the post cycled structures a mechanism was proposed for the differing evolutions of the uncoated and coated Mg powders based upon a complex process in which particle sintering competes with particle fragmentation. Catalyst effectiveness varied with temperature, having a negligible impact on hydrogen storage characteristics of the atomised Mg powders following 50 cycles at 400 degrees C and this was mainly associated with the lack of multivalency in the catalysts. (C) 2017 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.
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