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Pore size effects of nanoporous carbons with ultra-high surface area on high-pressure hydrogen storage

Journal of Energy Chemistry 2015年第1期24卷 1-8页

作者： Zhen Geng Cunman Zhang Dabin Wang Xiangyang Zhou Mei Cai Clean Energy Automotive Engineering Center Tongji University School of Materials Science and Technology Tongji University School of Automotive Studies Tongji University Research & Development Center General Motors

In this work, the morphologies and pore structures of a series of corncob-derived activated carbons and zeolite templated carbon with ultrahigh surface area were carefully investigated by SEM, HRTEM and N2-sorption characterization technologies. The high-pressure hydrogen uptake performance was analyzed using standard Pressure-Composition-Temperature apparatus in order to study the pore size effects on hydrogen uptake. These as-obtained porous carbons showed different characteristics of pore size distribution as well as specific surface area. The results indicate that the most effective pores for adsorbing hydrogen depended on the storage pressure. These ultramicropores （0.65-0.85 nm） could be the most effective pores on excess H2 uptake at 1 bar, however, micropores （0.85-2 nm） would play a more important role in excess H2 uptake at higher pressure at 77 K. At room temperature, pore size effects on H2 uptake capacity were very weak. Both specific surface area and total pore volume play more important roles than pore size for H2 uptake at room temperature, which was clearly different from that at 77 K. For applications in future, the corncob-derived activated carbons can be more available than zeolite templated carbons at 77 K. Element doping enhanced hydrogen uptake could be main research direction for improving H2 uptake capacity at room temperature.

关键词： corncob activated carbon zeolite templated carbon hydrogen storage pore size effect

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Preparation of ultrahigh surface area porous carbons templated using zeolite 13X for enhanced hydrogen storage

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Progress in Natural Science:Materials International 2013年第3期23卷 308-316页

作者： Eric Masika Robert Mokaya School of Chemistry University of NottinghamUniversity ParkNottingham NG7 2RDUK

In this report,the use of zeolite 13X as a template to generate ultrahigh surface area carbons,via a two-step process combining liquid impregnation and chemical vapour deposition is *** first step in the nanocasting process involves impregnation of zeolite 13X with furfuryl alcohol and the second step consists of chemical vapour deposition(CVD) of ethylene at 700 ***-like structural ordering was achieved for zeolite templated carbons(ZTCs) prepared at variable heating ramp rates of 5,10 or 15 1C/*** textural properties of ZTCs prepared at all heating ramp rates were comparable with small variations in which the lowest ramp rate(5 1C/min) generated ZTC with highest surface area and pore volume of 3332 m 2 /g and 1.66 cm 3 /g *** carbon materials achieved a remarkable hydrogen uptake of 7.3 wt% at 20 bar and 77 K which is the highest ever recorded for carbon *** report also explores the mechanical stability of the ZTCs via compaction at up to 10t(equivalent to 740 MPa) in which the compacted samples showed minimal modification and retained high hydrogen storage capacity.

关键词： Hydrogen storage zeolite templated carbon zeolite 13X High surface area Micropores

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