Hydrogen storage properties of ball-milled graphite with 0.5wt% Fe

Yinghe Zhang, David Book

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    Ball-milled hydrogenated graphite-iron materials have attracted interest as possible hydrogen storage media because of theoretically estimated hydrogen capacities of about 10wt%. However, such a value needs to be experimentally verified. In this work, graphite-0.5wt% Fe was milled under 3bar hydrogen in a tungsten carbide milling pot. The effect of iron on the microstructure and hydrogen storage properties of milled graphite was investigated by thermal gravimetric analysis-mass spectrometry, X-ray diffraction, and transmission electron microscopy. When a 10-hour milled graphite with 0.5wt% Fe sample was heated under argon to 990°C, 9.6wt% of hydrogen was released, which is almost double than that for a graphite sample with no iron (5.5wt% hydrogen). The addition of iron also was found to reduce the onset temperature of hydrogen desorption by 50 to 350°C. However, for a longer milling time of 40hours, the amount of hydrogen desorbed for graphite-0.5wt% Fe decreased, and methane also was detected. The results suggest that iron carbide produced during milling plays a catalytic role, increasing the hydrogen storage capacity and lowering the onset temperature of hydrogen desorption.

    Original languageEnglish
    Pages (from-to)720-725
    Number of pages6
    JournalInternational Journal of Energy Research
    Volume37
    Issue number7
    DOIs
    Publication statusPublished - 2013 Jun 10

    Keywords

    • Ball milling
    • Graphite
    • Graphite-iron
    • Hydrogen
    • Hydrogen storage
    • Iron carbide
    • Methane
    • Milling time

    ASJC Scopus subject areas

    • Energy Engineering and Power Technology
    • Fuel Technology
    • Nuclear Energy and Engineering
    • Renewable Energy, Sustainability and the Environment

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