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首页> 外文期刊>Materials Science and Engineering. B, Solid-State Materials for Advanced Technology >Hydrogen storage properties on mechanically milled graphite
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Hydrogen storage properties on mechanically milled graphite

机译：机械研磨石墨的储氢性能

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We investigated hydrogen absorption/desorption and structural properties in mechanically milled graphite under hydrogen pressures up to 6 MPa to clarify catalytic and hydrogen pressure effects in the milling. The results indicate that a small amount of iron contamination during milling plays a quite important role as a catalyst for hydrogen absorption/desorption properties in graphite. Two-peak structure for hydrogen desorption in the TDS profile is due to existence of two different occupation sites for hydrogen, which is caused by the existence of high dispersing iron on graphite. From the experiment of high pressure milling, we clarified that the number of defects in graphite decreases with increasing the atmospheric hydrogen pressure during milling, leading to the decrease in the absorbed hydrogen content and the stabilization of hydrogen on the occupation sites. In addition, we confirmed the existence of physisorption-like reversible hydrogen at room temperature in the graphite prepared by milling under high pressure hydrogen atmosphere above 3 MPa. This unstable hydrogen might strongly be correlated with the existence of the lamella structure in nanometer scale, which only leaves in graphite prepared by high pressure milling.
机译：我们研究了在高达6 MPa的氢气压力下机械研磨的石墨中的氢吸收/解吸和结构特性，以阐明研磨过程中的催化和氢压力效应。结果表明，研磨过程中少量的铁污染作为石墨中氢吸收/解吸性能的催化剂起着非常重要的作用。 TDS曲线中氢解吸的两峰结构是由于存在两个不同的氢占据位点，这是由于石墨上存在高度分散的铁而引起的。从高压铣削的实验中，我们弄清楚了石墨中的缺陷数量随铣削过程中大气氢压的增加而减少，从而导致吸收氢含量的降低和氢在占据位置上的稳定性。另外，我们确认了在高于3 MPa的高压氢气氛下研磨制得的石墨在室温下存在类似物理吸附的可逆氢。这种不稳定的氢可能与纳米级片状结构的存在密切相关，而片状结构仅存在于通过高压研磨制备的石墨中。

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