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Materials 2015, 8(5), 2191-2203; doi:10.3390/ma8052191

Revisiting the Hydrogen Storage Behavior of the Na-O-H System

1
WestCHEM, School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, UK
2
Australian Synchrotron, Clayton, Victoria 3168, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Umit Demirci
Received: 19 February 2015 / Revised: 20 April 2015 / Accepted: 22 April 2015 / Published: 28 April 2015
(This article belongs to the Special Issue Hydrogen Storage Materials)
View Full-Text   |   Download PDF [977 KB, uploaded 28 April 2015]   |  

Abstract

Solid-state reactions between sodium hydride and sodium hydroxide are unusual among hydride-hydroxide systems since hydrogen can be stored reversibly. In order to understand the relationship between hydrogen uptake/release properties and phase/structure evolution, the dehydrogenation and hydrogenation behavior of the Na-O-H system has been investigated in detail both ex- and in-situ. Simultaneous thermogravimetric-differential thermal analysis coupled to mass spectrometry (TG-DTA-MS) experiments of NaH-NaOH composites reveal two principal features: Firstly, an H2 desorption event occurring between 240 and 380 °C and secondly an additional endothermic process at around 170 °C with no associated weight change. In-situ high-resolution synchrotron powder X-ray diffraction showed that NaOH appears to form a solid solution with NaH yielding a new cubic complex hydride phase below 200 °C. The Na-H-OH phase persists up to the maximum temperature of the in-situ diffraction experiment shortly before dehydrogenation occurs. The present work suggests that not only is the inter-phase synergic interaction of protic hydrogen (in NaOH) and hydridic hydrogen (in NaH) important in the dehydrogenation mechanism, but that also an intra-phase Hδ+… Hδ– interaction may be a crucial step in the desorption process. View Full-Text
Keywords: hydrogen storage; sodium oxide; sodium hydride; sodium hydroxide; in-situ synchrotron powder diffraction hydrogen storage; sodium oxide; sodium hydride; sodium hydroxide; in-situ synchrotron powder diffraction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Mao, J.; Gu, Q.; Gregory, D.H. Revisiting the Hydrogen Storage Behavior of the Na-O-H System. Materials 2015, 8, 2191-2203.

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