Dependence of hydrogen storage characteristics of mechanically milled carbon materials on their host structures

Shindo, Kazuhiko; Kondo, Toshihiko; Sakurai, Yasuhisa

doi:10.1016/j.jallcom.2003.08.103

Cited by 28 publications

(31 citation statements)

References 9 publications

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“…Furthermore, the hydrogen storage capacities of natural graphite (NG) and activated carbon fiber (ACF) showed little dependence on their host structures in our studies and were both about 3.0 wt.% [4]. We believe that the difference between the capacities of the nanostructured graphite reported by Orimo et al [1,2] and our nanocarbons [3,4] might be related to the milling conditions. Table 1 shows the principal differences between their and our milling conditions.…”

Section: Introductionmentioning

confidence: 47%

“…Although we tried to prepare a better hydrogen storage material by using activated carbon (AC) powders with many defects, the maximum capacity of AC hydrogenated by mechanical milling was only 2.6 wt.% [3]. Furthermore, the hydrogen storage capacities of natural graphite (NG) and activated carbon fiber (ACF) showed little dependence on their host structures in our studies and were both about 3.0 wt.% [4]. We believe that the difference between the capacities of the nanostructured graphite reported by Orimo et al [1,2] and our nanocarbons [3,4] might be related to the milling conditions.…”

Section: Introductionmentioning

confidence: 70%

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Influence of milling conditions on hydrogen storage capacities of activated carbon mechanically milled in an H2 atmosphere

Shindo

Kondo

Sakurai

2005

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 47%

Section: Introductionmentioning

confidence: 70%

Influence of milling conditions on hydrogen storage capacities of activated carbon mechanically milled in an H2 atmosphere

Shindo

Kondo

Sakurai

2005

Journal of Alloys and Compounds

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“…In that case, the nanostructured graphite with the grain size of 4 nm was formed. Slightly different results were obtained by Shindo et al [6] for natural graphite milled in hydrogen for 100 h using a similar mill. The authors observed the disappearance of the peak (0 0 2) and attributed this effect to the conversion of the crystalline graphite into an amorphous phase.…”

Section: Sample Characterizationmentioning

confidence: 68%

“…Some TDS spectra of mechanically milled carbon-type materials (i.e. natural graphite, activated carbon fibres and activated carbon powder) have been reported earlier [5,6]. The spectra were broad with peaks that were not fully developed.…”

Section: Introductionmentioning

confidence: 91%

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Structural transformations in graphite induced by magneto-mechanical-milling in hydrogen atmosphere

Smolira

Szymańska

Jartych

et al. 2005

Journal of Alloys and Compounds

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

Zhang

Book

2011

Int. J. Energy Res.

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SUMMARY Ball‐milled hydrogenated graphite‐iron materials have attracted interest as possible hydrogen storage media because of theoretically estimated hydrogen capacities of about 10 wt%. However, such a value needs to be experimentally verified. In this work, graphite‐0.5 wt% Fe was milled under 3 bar 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 0.5 wt% Fe sample was heated under argon to 990 °C, 9.6 wt% of hydrogen was released, which is almost double than that for a graphite sample with no iron (5.5 wt% 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 40 hours, the amount of hydrogen desorbed for graphite‐0.5 wt% 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. Copyright © 2011 John Wiley & Sons, Ltd.

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Dependence of hydrogen storage characteristics of mechanically milled carbon materials on their host structures

Cited by 28 publications

References 9 publications

Influence of milling conditions on hydrogen storage capacities of activated carbon mechanically milled in an H2 atmosphere

Influence of milling conditions on hydrogen storage capacities of activated carbon mechanically milled in an H2 atmosphere

Structural transformations in graphite induced by magneto-mechanical-milling in hydrogen atmosphere

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

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