Ameer Randolph
Hydrogen fuel cell vehicles are a promising technology that utilizes a fuel cell stack to convert onboard hydrogen gas into electricity through a chemical reaction with oxygen from the air. This electricity powers an electric motor that drives the vehicle, and the only emission produced is water vapour. The calculation of hydrogen consumption in these vehicles depends on several factors, including engine efficiency, consumption per kilometre, desired range, and available refueling infrastructure. An average hydrogen vehicle can consume approximately 0.05 to 0.1 kg of hydrogen per kilometre, resulting in a range of around 500 to 800 kilometres per full tank. As hydrogen refueling infrastructure expands, the practicality and efficiency of these vehicles are expected to improve, making them a viable alternative to conventional internal combustion engines.
How many liters of hydrogen to fuel a car?
| Characteristics | Values |
|---|---|
| How hydrogen cars work | Hydrogen cars, also known as fuel cell vehicles, use a fuel cell stack to convert gaseous hydrogen into electricity through a chemical reaction with oxygen from the air. |
| Emissions | The only emission from this process is water vapour. |
| Efficiency | The efficiency of a hydrogen engine is a critical factor in determining how much hydrogen is needed. Modern hydrogen engines are quite efficient, with a conversion efficiency of hydrogen into electricity exceeding 60%. |
| Hydrogen consumption | An average hydrogen vehicle consumes approximately 0.05 to 0.1 kg of hydrogen per kilometre, resulting in a consumption rate of about 50 to 100 km/kg. |
| Hydrogen storage | Hydrogen vehicles typically have tanks that can hold 5 to 8 kg of high-pressure compressed hydrogen. |
| Range | With the average consumption rates, a full tank of hydrogen can provide a range of approximately 500 to 800 kilometres. |
| Refuelling infrastructure | The availability of hydrogen refuelling stations is a factor in the calculation of how much hydrogen a car needs. As the infrastructure expands, hydrogen vehicles become more practical and convenient. |
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What You'll Learn
Hydrogen engine efficiency
The efficiency of a hydrogen combustion engine can be comparable to that of a conventional combustion engine. When properly optimized, hydrogen combustion engines may even achieve slightly higher efficiency levels. For instance, a BMW hydrogen-gasoline hybrid vehicle achieves 40% efficiency when running on hydrogen, compared to less than 30% for gasoline.
However, hydrogen combustion engines are less efficient than hydrogen fuel cells (HFCs). HFCs have a high efficiency peak at low load, while their efficiency drops at high load. Conversely, hydrogen combustion engines have a peak at high load and can achieve similar efficiency levels as HFCs. As such, hydrogen combustion engines are a match in terms of efficiency for HFCs for heavy-duty applications.
The efficiency of a 67 ml 4-stroke engine converted to hydrogen and tested at the best operating point (3000 rpm, 14 NLM, 2.5 times stoichiometric air/fuel ratio) achieved 520 W and 21% efficiency. Similarly, a 107 ml engine (Honda GX110 with best gasoline efficiency of 26%) achieved 3.5% to 5.9% average efficiency and 7.5% peak efficiency.
While hydrogen engines are carbon-neutral, they are not emission-free. The combustion process can generate nitrogen oxides, a harmful variety of greenhouse gas. Additionally, the process of extracting, producing, and transporting raw hydrogen is currently very carbon-intensive, which may reduce its potential environmental value as an alternative fuel. Due to these drawbacks, investment and research are primarily focused on HFC vehicles rather than hydrogen combustion engine technology.
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Hydrogen storage density
One method to increase storage density is to use chemical compounds that can release hydrogen on demand. For example, supercritical hydrogen at specific temperatures and pressures has a lower density than methanol or dimethyl ether, which can store more hydrogen molecules per litre. This chemical storage approach offers high storage performance due to its high storage densities.
Another approach is to use lightweight hydrides, such as MgH2 and CaH2, which offer high gravimetric hydrogen storage. However, they require high temperatures for desorption, and the weight of hydrogen they carry can be a challenge. Some hydrides are easy-to-fuel liquids at ambient temperature and pressure, while others are solids that can be turned into pellets, offering good energy density.
Recent research has made significant advancements in high-density hydrogen storage. Professor Hyunchul Oh and his team at UNIST have developed a nanoporous magnesium borohydride structure (Mg(BH₄)₂) that can store hydrogen at high densities under normal atmospheric pressure. This innovative material surpasses the traditional storage method of hydrogen as a gas in a liquid state, offering an impressive hydrogen storage capacity of 144 g/L per volume of pores. This breakthrough enhances the efficiency and economic viability of hydrogen energy utilisation, bringing it a step closer to practical applications.
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Hydrogen refueling infrastructure
Hydrogen has the potential to reshape the US economy and support the adoption of clean energy. However, to fully realize these benefits, hydrogen refueling infrastructure development is crucial. This includes the establishment of hydrogen fueling stations, which are essential in delivering hydrogen fuel to consumers. As of 2024, there were 54 retail hydrogen stations available in the US, predominantly in California.
Retail hydrogen stations are open to the public and accept payments directly, while non-retail stations cater to specific clientele with access criteria like specialized training or membership in an organization. The expansion of hydrogen fueling locations is underway in Hawaii and the East Coast, with other markets expected to follow as demand increases. To address the challenge of providing reasonably priced hydrogen, the US Department of Transportation Federal Highway Administration (FHWA) established a National Alternative Fuels Corridors grant program in 2022.
The Bipartisan Infrastructure Law includes $7 billion in funding for seven Regional Clean Hydrogen Hubs (H2Hubs) to accelerate the deployment of low-cost, clean hydrogen. These H2Hubs aim to develop a network for clean hydrogen production, storage, distribution, and end-use across the country. Additionally, the Inflation Reduction Act of 2022 incentivizes projects with low-lifecycle greenhouse gas emissions by offering a tax credit of up to $3 per kilogram of hydrogen.
The development of hydrogen refueling infrastructure is not limited to consumer vehicles. Efforts are being made to expand infrastructure for buses, medium-duty fleets, and material handling equipment. Mobile hydrogen fuelers, which store liquefied or compressed hydrogen and dispensing equipment on trailers, are also being developed to enhance hydrogen accessibility. As the market for hydrogen fuel cell electric vehicles grows, the need for a comprehensive hydrogen refueling infrastructure becomes more pressing.
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Hydrogen consumption per kilometer
Hydrogen fuel cell vehicles are a potential alternative to conventional vehicles, offering a significant reduction in fuel consumption and well-to-wheel greenhouse gas emissions. Hydrogen can be used to fuel cars, providing zero-emission mobility for passenger vehicles, as well as road, rail, marine, and air transport.
The hydrogen consumption of a vehicle depends on various factors, including the driving range, number of cycles, and driving style. Research has been conducted to test the hydrogen consumption of fuel cell vehicles under different conditions, such as the CLTC-P condition. During these tests, the hydrogen consumption per 100 kilometers was measured for a single cycle, three cycles, and six cycles. The results showed that the hydrogen consumption per 100 kilometers ranged from 0.815 kg to 0.983 kg, with the deviation from the average value decreasing as the number of cycles increased.
In a real-world example, the Toyota Mirai broke the 1,000-kilometer range barrier, covering 1,003 kilometers on a single tank of fuel green hydrogen fuel. The overall consumption was measured at 0.55 kg/100km, demonstrating the efficiency of hydrogen fuel cell technology. This achievement highlights the potential for hydrogen mobility and the advantages of zero-emission, long-distance capability, and simple refuelling.
It is worth noting that the hydrogen consumption per kilometer can vary depending on various factors, such as vehicle model, driving conditions, and hydrogen storage system. Additionally, the driving range and mileage can be influenced by factors such as braking energy recovery strategies, which can extend the initial and final driving range. Overall, hydrogen fuel cell vehicles offer enhanced driving performance, improved fuel efficiency, and a more environmentally sustainable option for the transport sector.
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Hydrogen vehicle range
The range of a hydrogen car depends on several factors, including the vehicle's efficiency, engine efficiency, consumption per kilometer, desired range, and available refueling infrastructure. Hydrogen vehicles, also known as fuel cell vehicles, are powered by an electric motor and produce their electricity using a fuel cell stack that converts gaseous hydrogen stored onboard into electricity through a chemical reaction with oxygen from the air.
The efficiency of the hydrogen engine is a critical factor in determining the range of a hydrogen vehicle. Modern hydrogen engines are quite efficient, with conversion efficiencies exceeding 60%, which is notably higher compared to conventional internal combustion engines. An average hydrogen vehicle can consume approximately 0.05 to 0.1 kg of hydrogen per kilometer, resulting in a consumption rate of about 50 to 100 km/kg.
The range of a hydrogen car is also influenced by the amount of hydrogen it can store in its fuel tank. Hydrogen vehicles typically have tanks that can hold 5 to 8 kg of high-pressure compressed hydrogen. With the average consumption rates mentioned earlier, this would translate to a range of approximately 500 to 800 kilometers per full tank. However, the calculation of how much hydrogen a hydrogen car needs is also impacted by the availability of hydrogen refueling stations. As hydrogen refueling infrastructure expands, drivers will have access to a more reliable supply of hydrogen, making the technology more practical and convenient.
As hydrogen vehicle technology continues to evolve, advances in engine efficiency, hydrogen storage density, and refueling infrastructure can further increase the range of hydrogen vehicles. Hydrogen vehicles have the potential to offer an emission-free alternative to traditional internal combustion engines without the long charging times associated with battery-powered electric cars.
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Frequently asked questions
The amount of hydrogen needed to fuel a car depends on several factors, including engine efficiency, consumption per kilometer, desired range, and available refueling infrastructure. An average hydrogen vehicle can consume approximately 0.05 to 0.1 kg of hydrogen per kilometer, resulting in a consumption rate of about 50 to 100 km/kg.
A hydrogen car, also known as a fuel cell vehicle, is powered by an electric motor and uses a fuel cell stack to convert gaseous hydrogen stored onboard into electricity through a chemical reaction with oxygen from the air.
Hydrogen cars produce electricity through a process known as reverse electrolysis, where hydrogen reacts with oxygen to produce electrical energy, heat, and water vapor. This electricity powers the electric motor and drives the vehicle.
Hydrogen cars offer several advantages, including fewer pollutants, less noise, and dynamic driving performance. They also have shorter refueling times compared to traditional electric vehicles and can recover braking energy.
The range of a hydrogen car depends on the amount of hydrogen it can store in its fuel tank. Hydrogen vehicles typically have tanks that can hold 5 to 8 kg of high-pressure compressed hydrogen, resulting in a range of approximately 500 to 800 kilometers per full tank.
