Who Is Filing — and Why the Hydrogen Storage Patent Race Matters

The hydrogen storage materials field is represented across the surveyed dataset by more than 50 patent documents and peer-reviewed literature entries, spanning jurisdictions including the United States, China, South Korea, Canada, Europe, India, and Australia. This geographic spread reflects the degree to which hydrogen storage has become a strategic priority not just for automakers and energy companies, but for national research institutions in economies betting on hydrogen as a load-balancing fuel for intermittent renewable power. According to the IEA, hydrogen is central to net-zero pathways across multiple sectors, making the materials-science race to solve practical storage a competition with consequences well beyond individual patent portfolios.

The dominant assignees by filing frequency illustrate a striking mix of automotive OEMs, specialist start-ups, and public research institutions. Nissan Motor Co., Ltd. leads with at least six patents; Ford Global Technologies, LLC holds four; Kubagen Ltd. and Limnia, Inc./FuelSell Technologies each account for four filings; the University of New Brunswick holds three; and Korea Institute of Science and Technology, Santoku Corporation, and Battelle Savannah River Alliance each contribute two. Chinese institutional assignees — including Zhejiang University, Yanshan University, and China Youyan Technology Group — are increasingly prominent, reflecting a policy-driven push to build domestic IP in hydrogen infrastructure materials.

The five dominant technical approaches — metal hydrides, liquid organic hydrogen carriers, slurry composites, nanostructured carbonaceous materials, and AI/computational alloy design — each address the same core trade-offs: gravimetric and volumetric capacity, operating temperature and pressure, absorption/desorption kinetics, cycling stability, and cost. None has yet solved all five simultaneously, which is precisely why the patent activity remains so fragmented across materials classes and jurisdictions.

Metal Hydrides and Complex Hydride Systems: High Density, Persistent Challenges

Metal hydrides remain the most extensively patented class of hydrogen storage material, combining high volumetric density with the ability to operate at near-ambient pressures compared to compressed gas tanks. Key performance parameters for any hydride system include operating pressure-temperature conditions, gravimetric capacity, and absorption-desorption kinetics — each of which must be optimized for a specific end-application, as documented across multiple reviews in the dataset covering metal hydrides, magnesium-based materials, complex hydride systems, carbonaceous materials, MOFs, and perovskites.

Ford Global Technologies patented several high-density systems based on LiBH₄ combined with metal hydride matrices (MHₓ where M = Ti, V, Cr, Sc, Fe, or Al), with the aluminum-variant formulation receiving a separate patent in 2010. Nissan Motor Co. developed multi-layer composite hydride architectures in which aluminium hydride (AlH₃) forms a first storage body coated by complex hydrides such as NaAlH₄, LiBH₄, or Mg(AlH₄)₂, engineering a controlled hydrogen equilibrium pressure gradient — an approach disclosed in a 2015 European patent.

TiFe-based alloys represent a commercially attractive metal hydride class due to mild activation conditions and cost-effectiveness. Santoku Corporation’s 2024 Australian patent describes a microstructurally engineered TiFe-based hydrogen storage alloy in which rare-earth (R)-enriched phases with diameters of 0.1–10 µm are distributed at controlled inter-phase spacings of 0.5–20 µm to improve initial activation and dischargeable hydrogen capacity. The mechanical durability challenge — specifically the 20–30% volumetric expansion that causes micro-cracking and powder formation — is separately addressed by both Yanshan University and Yunnan Power Grid’s research institute through novel composite alloy architectures.

“Despite high hydrogen density, poor reversibility and high sorption temperatures continue to restrict practical deployment of complex borohydrides — a challenge the field has not resolved since at least 2018.”

Liquid Organic Hydrogen Carriers and Slurry Composites: Ambient Handling, Kinetic Penalties

Liquid organic hydrogen carriers (LOHCs) enable ambient-pressure transport and storage of hydrogen in chemically bound form — a significant practical advantage over both compressed gas and cryogenic liquid storage, which carry substantial infrastructure cost and safety burdens. The Korea Institute of Science and Technology has filed two US patents for a biphenyl/carbazole-based reversible liquid hydrogen storage system. The carbazole backbone is also widely represented in Chinese patent filings: Xiamen Aiditai Environmental Technology disclosed an N-isopropylindole/N-isopropylcarbazole system pressurized to 70–80 bar at 130–160°C over precious metal hydrogenation catalysts in a 2026 Chinese patent. Jiangsu Hydrogen Core Power Technology’s 2022 Chinese patent further developed methylindole-based LOHC blends (7-methylindole 10–80 wt%, 7-ethylindole 20–90 wt%) offering lower dehydrogenation temperatures and reduced energy losses.

The slurry hydrogen storage material — a composite of solid inorganic hydrides and liquid organic carriers co-blended into a flowable slurry — is an architecturally distinct innovation that attempts to combine the high capacity of metal hydrides with the handling advantages of liquid carriers. Zhejiang University pioneered this concept (CN, 2002), with the solid component catalyzing hydrogenation of the organic liquid phase. Suzhou Qingde Hydrogen Energy Science and Technology has subsequently filed multiple active patents on slurry materials (2022 and a 2024 continuation), seeking to overcome the poor sorption kinetics of pure LOHCs and the high-temperature limitations of pure solid hydrides. A 2025 patent from Yangzhou Polytechnic Institute acknowledges that achieving more than 5 wt% overall capacity in slurry composites remains technically challenging, particularly under non-ideal temperature and pressure conditions.

China Youyan Technology Group filed for a slurry material enabling hydrogen storage and transport at ambient temperature and pressure (CN, 2021), positioning it as an alternative to high-pressure compressed storage and cryogenic liquid hydrogen. A photocatalytic variant from China University of Geosciences (Wuhan, 2025) targets the low dehydrogenation efficiency — approximately 80% — of N-heterocyclic organic slurries even at 150–300°C. An IEA-coordinated review confirms that liquid hydrogen carriers are now considered a mature research direction alongside complex hydrides and intermetallic hydrides, with practical deployment dependent on solving the dehydrogenation energy penalty and catalyst selectivity issues.

Carbonaceous, MOF-Based, and Nanostructured Approaches: Promise Tempered by Performance Gaps

Nanostructured carbons — including graphene, carbon nanotubes, and porous carbon scaffolds — attract sustained research as physisorption-based hydrogen storage media. Their appeal lies in light weight, tunable surface area, and relevance to mobile applications where gravimetric density is critical. However, as noted in peer-reviewed literature spanning from 2013 to 2021 and cited in the dataset, graphene-based systems have not yet met practical capacity and adsorption/desorption control requirements, despite theoretical promise identified by researchers at institutions including Nature-indexed journals.

Nissan Motor Co. developed carbonaceous hydrogen storage materials utilizing six-membered ring molecular layers (graphene-like structures) with engineered interlayer protrusions to increase accessible hydrogen storage volume, as described in a 2008 US patent. An earlier 2004 US Nissan patent covers carbon-based hydrogen storage bodies with engineered sheet openings for the same purpose. Honda Motor Co. independently patented an amorphous Al–Mg alloy matrix containing dispersed crystalline Al and TiH₂ phases (each ≤200 nm) as a reversible hydrogen storage material (US, 2012).

Metal-organic frameworks (MOFs) are increasingly integrated with carbon scaffolds to optimize both surface area and hydrogen uptake. The composite of graphene foam with UiO-66 (a zirconium-based MOF) achieves a BET surface area of 1073 m²/g and hydrogen uptake of 1.1 wt% at 77 K, as reported in 2018. While this uptake is below the pristine UiO-66 benchmark of 1.5 wt%, the composite enables integration into engineered systems. Standards bodies including ISO are increasingly developing test protocols for MOF-based storage materials, reflecting the maturation of the field from laboratory demonstration toward system integration. The broader role of MOFs for nano-confinement of hydrogen — including the effects of pore size, surface area, and ligand functionalization — is comprehensively reviewed in literature entries within the dataset.

High-Entropy Alloys and AI-Assisted Discovery: The Next Frontier for Hydrogen Storage Design

High-entropy alloys (HEAs) containing five or more principal elements have emerged as a structurally versatile platform for tailoring hydrogen storage thermodynamics. Multicomponent alloys offer a broader compositional space to tune lattice parameters, plateau pressures, and formation enthalpies beyond what is achievable in binary or ternary systems — a finding documented in literature from 2022 cited in the dataset. This compositional freedom is precisely what makes HEAs attractive for hydrogen storage: conventional binary alloys such as TiFe have fixed thermodynamic properties that constrain operating windows, whereas a five-component HEA can be compositionally tuned toward a desired pressure-temperature profile.

The growing role of CALPHAD thermodynamic modeling and machine learning in accelerating alloy composition screening is highlighted in the 2022 metallic materials overview cited in the dataset. By reducing reliance on expensive experimental trial-and-error synthesis, computational approaches are compressing the development cycle for new storage alloys — a trend also recognized by research programs at institutions reporting to WIPO as part of broader hydrogen technology patent disclosures. The intersection of AI-driven material discovery with the five-element compositional freedom of HEAs represents the most forward-looking segment of the current patent landscape.

The convergence of AI-driven alloy screening with the five-element compositional freedom of HEAs is significant because it transforms what was previously an intractable search problem into a tractable one. Where experimentalists historically evaluated alloy compositions one at a time, machine learning models trained on thermodynamic data can now rank thousands of candidate compositions against target hydrogen storage properties, directing synthesis effort toward the most promising regions of compositional space. This is consistent with broader trends in materials informatics reported by organisations such as the OECD in its assessments of AI applications in clean energy materials research.

The practical implication for IP strategists is that the white space in high-entropy alloy hydrogen storage remains substantially open compared to the crowded metal hydride and LOHC domains — creating patent filing opportunities for organisations willing to invest in computational alloy discovery now, ahead of the experimental validation wave.