Hydrogen desorption behavior of vanadium borohydride synthesized by modified mechano-chemical process

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Title:	Hydrogen desorption behavior of vanadium borohydride synthesized by modified mechano-chemical process
Authors:	Yang,CH;Tsai,WT;Chang,JK
Contributors:	材料科學與工程研究所
Keywords:	STORAGE PROPERTIES;THERMAL-DECOMPOSITION;LITHIUM BOROHYDRIDE;METAL-BOROHYDRIDES;ALUMINUM HYDRIDES;CARBON;NANOPARTICLES;SIZE
Date:	2011
Issue Date:	2012-03-27 16:29:08 (UTC+8)
Publisher:	國立中央大學
Abstract:	The vanadium borohydride was synthesized by a mechano-chemical milling method and its hydrogen desorption performance was evaluated. The effect of cooling during milling process on the hydrogen desorption behavior was also investigated. Nearly pure hydrogen was detected using a mass spectrometer coupled with a simultaneous thermal analyzer. Thermogravimetric method was conducted to determine the initial desorption temperature and the amount of hydrogen released from the hydride. The initial desorption temperature of vanadium borohydride was found below 100 degrees C, with an enthalpy change of 25.4 kJ/mol V(BH(4))(3). The amount of hydrogen released from the hydride prepared by milling but without cooling was 0.25 wt%, while that prepared with controlled cooling at 20 degrees C was 1 wt%. A beneficial effect of enhanced hydrogen release to 2.2 wt% from borohydride was found if multi-walled carbon nanotubes (MWCNTs) were added as an additive. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Relation:	INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Appears in Collections:	[Institute of Materials Science and Engineering] journal & Dissertation

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