Verne Hydrogen, an American hydrogen energy startup founded in 2020, develops advanced cryo-compressed hydrogen (CcH2) technology for hydrogen storage, which is crucial for enabling zero-emission transportation in trucks, airplanes, and ships.
Challenges:Â hydrogen storage
As we move toward a cleaner energy future, hydrogen's versatility and sustainability make it an increasingly attractive option. This clean energy carrier offers several advantages, including the potential for production from renewable resources, zero-emission combustion, and high energy density. Applications for this highly portable energy source range from generating electricity through fuel cells to producing heat through combustion, all while minimizing greenhouse gas emissions. Its flexibility and eco-friendly nature position hydrogen as a key player in the evolving energy landscape.
Traditionally, the world has relied heavily on steam methane reforming (SMR) to produce over 60 million tons of hydrogen annually. However, this method comes with a significant environmental cost. It's an energy-intensive process that contributes approximately 2% to global carbon dioxide (COâ‚‚) emissions, releasing between 5 and 9 tons of COâ‚‚ for every ton of hydrogen it generates.
There are cleaner paths to producing hydrogen, such as water electrolysis and methane pyrolysis.
Transporting hydrogen to end users is crucial after production, but this process is challenging due to hydrogen's distinct chemical and physical properties. Safety concerns stem from hydrogen's potential to cause material embrittlement and its tendency to escape from containment. Furthermore, hydrogen's wide flammability range and low ignition energy present significant risks. These factors pose substantial challenges to the widespread and safe adoption of hydrogen as an energy carrier.
Several solutions have been developed for hydrogen transportation, each with its own limitations:
- High-pressure/compressed hydrogen
This method uses bulk storage vehicles like tube trailers, but it faces constraints in transport volume and suffers from hydrogen losses, reducing efficiency over long distances. Compressed hydrogen storage and transportation can consume up to 20% of the fuel's energy content.
- Liquid cryogenic hydrogen
Favored for high-volume transport, especially without pipelines, this approach involves cooling hydrogen to below 20K through liquefaction and transporting it in liquid tankers with onboard cooling systems. While effective for large volumes, it is energy-intensive, potentially using up to 40% of the hydrogen's energy content.
- Adsorption materials
Metal hydrides, formed by the chemical reaction of metals and hydrogen gas, offer a compact method of storing hydrogen. They are denser than liquid hydrogen and can be stored at normal temperatures and pressures. However, metal hydrides have a relatively low hydrogen storage capacity, ranging from 1-5% by weight, and are unsuitable for flow-based transportation methods like pipelines. They are primarily used in stationary applications due to their high energy demand and slow kinetics associated with hydrogen absorption and release.
- Liquid Organic Hydrogen Carriers (LOHCs)
LOHCs present an innovative solution for hydrogen storage and transport. This technology involves hydrogenating an unsaturated organic compound, such as toluene, to form a hydrogen-rich liquid like methylcyclohexane, which can be stored and transported under ambient conditions without high pressures or low temperatures. When hydrogen is needed, methylcyclohexane undergoes dehydrogenation, releasing hydrogen for use. This process is facilitated by catalysts and can be integrated into existing fuel infrastructure, making LOHCs a practical and cost-effective alternative to traditional hydrogen storage methods.
Verne Hydrogen Technology
Verne Hydrogen develops advanced cryo-compressed hydrogen (CcH2) storage technology, which combines the advantages of both compressed gaseous and liquid hydrogen storage methods. Traditional compressed hydrogen storage demands substantial volumes and high pressures, whereas liquid hydrogen storage is plagued by boil-off losses, operational complexity, high costs, and a centralized supply chain. Cryo-compressed hydrogen seeks to address these issues by providing a solution that combines the ease and practicality of compressed hydrogen with the high density benefits of liquid hydrogen, often achieving comparable densities than those of liquid hydrogen.
Existing methods for generating cryo-compressed hydrogen start with the expensive production of liquid hydrogen. Liquefaction systems are energy inefficient, especially at the scales required for new hydrogen economy applications such as trucking stations. Following liquefaction, hydrogen is converted into cryo-compressed hydrogen using a cryogenic high-pressure pump. This indirect approach is not only energy inefficient but also depends on a liquid hydrogen supply and necessitates costly cryogenic high-pressure pumps.
Verne Hydrogen avoids the liquefaction process to achieve cryo-compressed hydrogen storage with a high density of 73 g/L, resulting in significant energy savings. This high density enables vehicles to attain a diesel-equivalent range and payload without additional weight, positioning it as a practical alternative to diesel for long-haul and heavy-duty applications.
How Verne Hydrogen produces cryo-compressed hydrogen
The diagram below illustrates Verne Hydrogen's cryo-compressed hydrogen storage and dispensing system.
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