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Title: Powder properties of hydrogenated ball-milled graphite

Ball milling is an effective way of producing defective and nanostructured graphite. In this work, the hydrogen storage properties of graphite, ball-milled in a tungsten carbide milling pot under 3 bar hydrogen for various times (0–40 h), were investigated by TGA-Mass Spectrometry, XRD, SEM and laser diffraction particle size analysis. For the conditions used in this study, 10 h is the optimum milling time resulting in desorption of 5.5 wt% hydrogen upon heating under argon to 990 °C. After milling for 40 h, the graphite became significantly more disordered, and the amount of desorbed hydrogen decreased. After milling up to 10 h, the BET surface area increased while particle size decreased; however, there is no apparent correlation between these parameters, and the hydrogen storage properties of the hydrogenated ball-milled graphite.
Authors:
 [1] ; ; ;  [2]
  1. Applied Chemistry, Waseda University, Tokyo, 162-0041 (Japan)
  2. Metallurgy and Materials, University of Birmingham, Birmingham, B15 2TT (United Kingdom)
Publication Date:
OSTI Identifier:
22420708
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 60; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ARGON; CORRELATIONS; DESORPTION; GRAPHITE; HEATING; HYDROGEN; HYDROGEN STORAGE; HYDROGENATION; MASS SPECTROSCOPY; MILLING; NANOSTRUCTURES; PARTICLE SIZE; POWDERS; SCANNING ELECTRON MICROSCOPY; SURFACE AREA; THERMAL GRAVIMETRIC ANALYSIS; TUNGSTEN CARBIDES; X-RAY DIFFRACTION