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Issue 44, 2018
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Gravimetric tank method to evaluate material-enhanced hydrogen storage by physisorbing materials

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Abstract

The most common methods to evaluate hydrogen sorption (volumetric and gravimetric) require significant experience and expensive equipment for providing reproducible results. Both methods allow one to measure excess uptake values which are used to calculate the total amount of hydrogen stored inside of a tank as required for applications. Here we propose an easy to use and inexpensive alternative approach which allows one to evaluate directly the weight of hydrogen inside a material-filled test tank. The weight of the same tank filled with compressed hydrogen in the absence of loaded material is used as a reference. We argue that the only parameter which is of importance for hydrogen storage applications is by how much the material improves the total weight of hydrogen inside of the given volume compared to compressed gas. This parameter which we propose to name Gain includes both volumetric and gravimetric characterization of the material; it can be determined directly without knowing the skeletal volume of the material or excess sorption. The feasibility of the Gravimetric Tank (GT) method was tested using several common carbon and Metal Organic Framework (MOF) materials. The best Gain value of ∼12% was found for the Cu-BTC MOF which means that the tank completely filled with this material stores a 12% higher amount of hydrogen compared to H2 gas at the same PT conditions. The advantages of the GT method are its inexpensive design, extremely simple procedures and direct results in terms of tank capacity as required for industrial applications. The GT method could be proposed as a standard check for verification of the high hydrogen storage capacity of new materials. The GT method is expected to provide even better accuracy for evaluation of a material's performance for storage of denser gases like e.g. CO2 and CH4.

Graphical abstract: Gravimetric tank method to evaluate material-enhanced hydrogen storage by physisorbing materials

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Publication details

The article was received on 16 Aug 2018, accepted on 18 Oct 2018 and first published on 19 Oct 2018


Article type: Paper
DOI: 10.1039/C8CP05241G
Citation: Phys. Chem. Chem. Phys., 2018,20, 27983-27991
  • Open access: Creative Commons BY-NC license
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    Gravimetric tank method to evaluate material-enhanced hydrogen storage by physisorbing materials

    A. Iakunkov, A. Klechikov, J. Sun, T. Steenhaut, S. Hermans, Y. Filinchuk and A. Talyzin, Phys. Chem. Chem. Phys., 2018, 20, 27983
    DOI: 10.1039/C8CP05241G

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