HyPStore’s Cryogenics-at-the-Core Vision for Liquid Hydrogen Storage

As global industries push toward decarbonization, hydrogen has re-emerged as a promising energy carrier. From aviation to long-haul trucking, hydrogen offers a zero-carbon fuel alternative that could reshape mobility. But unlocking its full potential depends on solving one of its biggest hurdles: storage. Hydrogen is challenging to contain, particularly in its most energy-dense form – liquid hydrogen, which exists only at cryogenic temperatures below -253 °C. That’s where HyPStore enters the picture, bringing cryogenics, nanomaterials, and international collaboration into focus.

HyPStore is a project funded under the UK-Australia Renewable Hydrogen Innovation Partnership Program, with additional support from Innovate UK. It brings together partners from both countries in a concentrated effort to develop safer, lighter, and more efficient cryogenic tanks for hydrogen storage. The United Kingdom’s contribution includes Graphene Innovations Manchester Ltd. (GIM), Marshall Slingsby Advanced Composites, Stratospheric Platforms Ltd, First Graphene (UK) Ltd, Queen Mary University of London and Brunel Composites Centre. From Australia, the team includes the University of Southern Queensland, University of Melbourne, and the Australia Sunlight Group, which is known for its work converting plastic waste into hydrogen.

At the heart of the project is the pursuit of an advanced storage solution capable of handling liquid hydrogen in real-world conditions. HyPStore’s consortium is focused on developing liner-less, fully composite tanks made from graphene-enhanced materials that are both structurally resilient and impermeable to hydrogen molecules. These tanks aim to outperform current systems by resisting mechanical stress, reducing hydrogen loss, and increasing durability under cryogenic conditions.

Storing hydrogen at -253 °C poses extreme challenges. Traditional polymer systems can embrittle and crack under rapid thermal cycling. Hydrogen’s low molecular weight and high diffusivity increase the risk of leakage, and any failure in containment poses serious safety risks. The HyPStore team is addressing these issues using graphene-reinforced nanocomposites that offer superior cryo-mechanical stability and barrier performance.

“These nanomaterials, produced through scalable processes, serve not only as a barrier to hydrogen migration but also enhance fracture resistance under extreme conditions,” said Dr. Sadik Omairey.

The nanocomposite tanks are being designed to integrate structural and safety innovations from the ground up. Brunel Composites Centre is leading the structural engineering effort, which includes incorporating leak-before-break features. Instead of catastrophic rupture, these tanks are engineered to vent under pressure, improving safety. Meanwhile, Queen Mary University is contributing self-healing polymer systems that allow microcracks to seal autonomously – adding resilience over time.

Graphene plays a central role in both structural and containment performance. Embedded within thermoplastic matrices, graphene nanoplatelets act as reinforcements that increase stiffness and create tortuous diffusion paths, dramatically reducing hydrogen permeability. Their two-dimensional structure bridges microcracks and distributes stress more evenly across the matrix. This dual function – mechanical strengthening and barrier enhancement – allows HyPStore to engineer tanks that are both lightweight and highly resistant to embrittlement.

“We’re seeing graphene act not just as a filler, but as a game-changing design element,” said Dr. Vasiliki Loukodimou. “It allows us to mitigate hydrogen embrittlement while reducing overall tank weight – an essential factor in aviation and aerospace applications.”

The project’s material validation process is rigorous. Samples undergo thermal cycling to simulate real-world conditions like launch and re-entry. Cryogenic mechanical testing includes tensile, compressive and interlaminar shear evaluations. High-resolution imaging, including X-ray computed tomography and scanning electron microscopy, helps track microcrack propagation. Raman spectroscopy confirms the dispersion of graphene throughout the composite, while embedded sensors allow real-time data collection during mechanical strain, feeding back into modeling and certification efforts.

Thermal insulation is another priority. Hydrogen boiloff – the gradual loss of fuel due to heat ingress – can be a critical flaw in cryogenic storage, especially for mobile applications. Traditional insulation methods add weight or complexity. HyPStore’s solution is to embed insulation into the composite itself using graphene aerogels and other nano-structured fillers. These materials combine ultralow thermal conductivity with structural reinforcement, creating hybrid laminates that retain stiffness and reduce boiloff without additional bulk.

“This approach is powerful because it allows us to control both heat transfer and mechanical performance with a single material system,” said Dr. Loukodimou.

To meet the mechanical demands of pressure cycling and thermal contraction, the tanks are being engineered with multi-layer composite structures optimized for load distribution. Finite element models guide the architecture, ensuring resilience under the repeated strain of refueling and deployment. Each layer contributes a unique function, from impact resistance to permeability control.

While HyPStore is laser-focused on hydrogen, the technologies it develops could impact the broader cryogenics industry. Applications in spaceflight, liquefied natural gas, and medical cryogenics could all benefit from lighter, safer tanks with embedded insulation and self-healing properties. Lessons from this project may also support cryogenic systems used in quantum computing and superconducting infrastructure.

The implications for the hydrogen economy are significant. To make hydrogen viable as a mainstream fuel, storage must become more efficient, scalable, and cost-effective. HyPStore’s tanks promise reduced system mass, extended service life, and improved safety margins – critical factors for sectors where every kilogram matters. In aviation, these tanks could help bridge the gap between hydrogen’s potential and its practical application.

More broadly, HyPStore illustrates the importance of international cooperation in clean energy innovation. UK-based breakthroughs in nanomaterials and composite design are being paired with Australian advancements in hydrogen production and lifecycle sustainability. Together, the team is building a system that stretches from waste-to-hydrogen conversion through to cutting-edge cryogenic containment.

“We’re not just developing a product, we’re creating a platform that can be scaled globally,” said Dr. Omairey. “This project is about establishing the missing link between green hydrogen production and its real-world use.”

Set to deliver prototypes and scalable manufacturing data within its 21-month timeline, HyPStore is positioned to influence both near-term deployment and long-term strategy in the hydrogen sector. And as the need for high-density, zero-emission fuels continues to grow, cryogenics will remain a cornerstone of this transition.

In the end, the future of hydrogen depends not just on how we generate it, but on how we keep it cool, stable, and safe. With cryogenics at the core, HyPStore is bringing that future closer—layer by engineered layer.

• by Dr. Sadik Omairey and Dr. Vasiliki Loukodimou, Brunel Composites Centre, Brunel University London