Issue 24, 2022

Freeze casting of porous monolithic composites for hydrogen storage


Hydrogen storage by adsorption offers operational benefits over energy intensive compression techniques. Incorporating physisorption materials in compression stores could improve hydrogen capacities, reducing the volume or pressure needed for storage vessels. However, such materials are often presented as fine powders and development efforts to date have predominantly focused on improving hydrogen uptake alone. Without due attention to industry-relevant attributes, such as handling, processability, and mechanical properties it is unlikely that these materials will find commercial application. In the paper, the desirable mechanical properties of hydrogen-adsorbent PIM-1 are exploited to yield a series of composite monoliths doped with a high surface area activated carbon, intended to act as pressure vessel inserts. Freeze casting techniques were successfully adapted for use with chloroform, facilitating the production of coherent and controlled three-dimensional geometries. This included the use of an innovative elastomeric mould made by additive manufacture to allow facile adoption, with the ability to vary multiple forming factors in the future. The composite monolith formed exhibited a stiffness of 0.26 GPa, a compressive strength of 6.7 MPa, and an increased BET surface area of 847 m2 g−1 compared to PIM-1 powders, signifying the first steps towards producing hydrogen adsorbents in truly useful monolithic forms.

Graphical abstract: Freeze casting of porous monolithic composites for hydrogen storage

Supplementary files

Article information

Article type
18 Jun 2022
14 Oct 2022
First published
18 Oct 2022
This article is Open Access
Creative Commons BY license

Mater. Adv., 2022,3, 8934-8946

Freeze casting of porous monolithic composites for hydrogen storage

G. M. Neville, R. Jagpal, J. Paul-Taylor, M. Tian, A. D. Burrows, C. R. Bowen and T. J. Mays, Mater. Adv., 2022, 3, 8934 DOI: 10.1039/D2MA00710J

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