Hydrogen storage properties of Mg-based multilayer films

In this study, four multilayer film samples of polyimide/Mg, polyimide/Mg/Ti, polyimide/Mg/Pd, and polyimide/Mg/Ti/Pd were prepared by pulsed laser deposition and evaluated for hydrogen absorption-desorption properties. Polyimide/Mg and polyimide/Mg/Ti samples did not absorb hydrogen under condition...

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Autores principales:	Takuma HASHIMOTO, Mitsuo NOTOMI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2016
Materias:	hydrogen storage multilayer film magnesium pct x-ray diffraction Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/6b625d4cba2541eb9fb551c8013c6801
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spelling	oai:doaj.org-article:6b625d4cba2541eb9fb551c8013c68012021-11-26T06:53:45ZHydrogen storage properties of Mg-based multilayer films2187-974510.1299/mej.16-00228https://doaj.org/article/6b625d4cba2541eb9fb551c8013c68012016-06-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/3/4/3_16-00228/_pdf/-char/enhttps://doaj.org/toc/2187-9745In this study, four multilayer film samples of polyimide/Mg, polyimide/Mg/Ti, polyimide/Mg/Pd, and polyimide/Mg/Ti/Pd were prepared by pulsed laser deposition and evaluated for hydrogen absorption-desorption properties. Polyimide/Mg and polyimide/Mg/Ti samples did not absorb hydrogen under conditions of 0.8 MPa and 200°C, while polyimide/Mg/Pd and polyimide/Mg/Ti/Pd samples absorbed hydrogen under the same conditions. The polyimide/Mg/Pd and polyimide/Mg/Ti/Pd samples desorbed hydrogen in the temperature ranges of 430-440°C and 140-200°C, respectively. The addition of Pd was necessary for the absorption of hydrogen because Pd promoted the dissociation of molecular hydrogen. The addition of Ti was necessary to decrease the temperature of dehydrogenation. The improved hydrogen absorption-desorption behavior could be caused by the structural change of MgH2 from bct to fcc and the decreased thermal stability of fcc MgH2 compared to that of bct MgH2. The hydrogen storage amount of the polyimide/Mg/Ti/Pd film was determined with pressure-composition-temperature measurements. The sample absorbed 0.42 wt.% hydrogen at 200°C and 2.0 MPa and 0.49 wt.% at 200°C and 10 MPa; hydrogen desorption was incomplete under both conditions. While the hydrogen storage amount of the polyimide/Mg/Ti/Pd film is less than that of pure Mg, it may be increased by omitting the base material of polyimide film.Takuma HASHIMOTOMitsuo NOTOMIThe Japan Society of Mechanical Engineersarticlehydrogen storagemultilayer filmmagnesiumpctx-ray diffractionMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 3, Iss 4, Pp 16-00228-16-00228 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	hydrogen storage multilayer film magnesium pct x-ray diffraction Mechanical engineering and machinery TJ1-1570
spellingShingle	hydrogen storage multilayer film magnesium pct x-ray diffraction Mechanical engineering and machinery TJ1-1570 Takuma HASHIMOTO Mitsuo NOTOMI Hydrogen storage properties of Mg-based multilayer films
description	In this study, four multilayer film samples of polyimide/Mg, polyimide/Mg/Ti, polyimide/Mg/Pd, and polyimide/Mg/Ti/Pd were prepared by pulsed laser deposition and evaluated for hydrogen absorption-desorption properties. Polyimide/Mg and polyimide/Mg/Ti samples did not absorb hydrogen under conditions of 0.8 MPa and 200°C, while polyimide/Mg/Pd and polyimide/Mg/Ti/Pd samples absorbed hydrogen under the same conditions. The polyimide/Mg/Pd and polyimide/Mg/Ti/Pd samples desorbed hydrogen in the temperature ranges of 430-440°C and 140-200°C, respectively. The addition of Pd was necessary for the absorption of hydrogen because Pd promoted the dissociation of molecular hydrogen. The addition of Ti was necessary to decrease the temperature of dehydrogenation. The improved hydrogen absorption-desorption behavior could be caused by the structural change of MgH2 from bct to fcc and the decreased thermal stability of fcc MgH2 compared to that of bct MgH2. The hydrogen storage amount of the polyimide/Mg/Ti/Pd film was determined with pressure-composition-temperature measurements. The sample absorbed 0.42 wt.% hydrogen at 200°C and 2.0 MPa and 0.49 wt.% at 200°C and 10 MPa; hydrogen desorption was incomplete under both conditions. While the hydrogen storage amount of the polyimide/Mg/Ti/Pd film is less than that of pure Mg, it may be increased by omitting the base material of polyimide film.
format	article
author	Takuma HASHIMOTO Mitsuo NOTOMI
author_facet	Takuma HASHIMOTO Mitsuo NOTOMI
author_sort	Takuma HASHIMOTO
title	Hydrogen storage properties of Mg-based multilayer films
title_short	Hydrogen storage properties of Mg-based multilayer films
title_full	Hydrogen storage properties of Mg-based multilayer films
title_fullStr	Hydrogen storage properties of Mg-based multilayer films
title_full_unstemmed	Hydrogen storage properties of Mg-based multilayer films
title_sort	hydrogen storage properties of mg-based multilayer films
publisher	The Japan Society of Mechanical Engineers
publishDate	2016
url	https://doaj.org/article/6b625d4cba2541eb9fb551c8013c6801
work_keys_str_mv	AT takumahashimoto hydrogenstoragepropertiesofmgbasedmultilayerfilms AT mitsuonotomi hydrogenstoragepropertiesofmgbasedmultilayerfilms
_version_	1718409722505199616

Hydrogen storage properties of Mg-based multilayer films

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