Microtech 2011

Strain effect on the hydrogen storage capacity of graphite oxide

J. Kim, M. Seo, J. Kim, S. Kang
Seoul National Univ., KR

Keywords: GO, strain, hydrogen stroage, milling


Among clean fuel alternatives hydrogen is one of the most attractive fuels due to its abundance, easy synthesis, and non-polluting nature when used in fuel cells. Recently carbon-based materials which have high specific surface area (SSA) draw attention due to its high physisorption ability. In this study we investigated the effect of strain on the interlayer separation of graphite oxide (GO). This high-energy milling process is used to provide defects in graphite structure via mechanical impact of balls during the milling process. At normal GO case interlayer separation is just 6~7Å, which is too close to store hydrogen along with decorations between the layer. After the milling process this parameter is found to increase about 10~20%, showing a possibility to improve uptake hydrogen capacity. We will discuss the results in terms of defect density and crystal structure along with the thermal stability of GO structure.

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