Unusual hydrogen absorption properties in graphite mechanically milled under various hydrogen pressures up to 6 MPa
Unusual hydrogen absorption properties in graphite mechanically milled under various hydrogen pressures up to 6 MPa
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DOI：
10.1016/s0925-8388(02)01355-5
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发表时间：
2003-05
影响因子：
6.2
通讯作者：
Chen Duanyang;T. Ichikawa;H. Fujii;N. Ogita;M. Udagawa;Y. Kitano;E. Tanabe
中科院分区：
文献类型：
--
作者：
Chen Duanyang;T. Ichikawa;H. Fujii;N. Ogita;M. Udagawa;Y. Kitano;E. Tanabe
在0.3 ~ 6.0 MPa的氢气压力范围内，研究了机械研磨石墨的吸氢/解吸行为。实验结果表明，随着磨氢压力的增加，80 h的化学吸附氢浓度从6.1 wt.%下降到4.1 wt.%，而物理吸附氢浓度随着磨氢压力的增加而增加，在6 MPa时达到0.5 wt.%以上。此外，高压氢气更有效地抑制了磨碎石墨的断裂速率，这表明被困在石墨烯片边缘和接近表面的石墨烯层之间的氢原子负责保留片层状纳米晶体结构，这可能是物理吸附式吸氢的宿主。
We examined hydrogen absorption/desorption behaviors in graphite mechanically milled under hydrogen pressures ranging from 0.3 to 6.0 MPa. Experimental results indicated that the chemisorbed hydrogen concentration during 80 h milling decreased from 6.1 to 4.1 wt.% with increasing milling hydrogen pressure, while the physisorption-like hydrogen concentration increased with increasing milling hydrogen pressure and reached more than 0.5 wt.% at 6 MPa. Moreover, higher pressure hydrogen suppressed the fracture rate of the milled graphite more effectively, suggesting that the hydrogen atoms trapped at the edges of the graphene sheets and between the graphene layers near the surface are responsible for preserving the lamellar nanocrystalline structure, which may be the host for physisorption-like hydrogen absorption.