Rajan Wilcox
Hydrogen fuel cell vehicles (HFCVs) are powered by an electric motor that uses hydrogen and oxygen to generate electricity. Unlike battery-electric vehicles, HFCVs produce their own electricity, which is stored as hydrogen in a tank on the vehicle. This means that refuelling an HFCV only takes around five minutes and offers a driving range of over 300 miles. However, there are challenges with HFCVs, such as the availability of hydrogen fuel and the high cost of building a nationwide network of hydrogen refuelling stations. Hydrogen is also difficult to produce and distribute with low losses, and it is more expensive than other fuel options. Despite these challenges, HFCVs have benefits such as reduced emissions and smooth, quiet performance.
Characteristics and Values of HFC Cars
| Characteristics | Values |
|---|---|
| Power Source | Hydrogen |
| Fuel Cell | Converts hydrogen and oxygen into water, producing electricity |
| Fuel Tank | Stores hydrogen gas onboard |
| Refueling Time | Approximately 5 minutes |
| Driving Range | 300-400 miles per refueling |
| Emissions | No harmful tailpipe emissions, only water vapour and warm air |
| Cost | A kilogram of hydrogen costs around 14 euros, providing a range of about 100 kilometres |
| Performance | Smooth, quiet, and peaceful driving experience |
| Fueling Infrastructure | Limited availability of hydrogen fuelling stations |
| Safety | Hydrogen fuel is hazardous due to its low ignition energy and high combustion energy; prone to leaks and explosions |
| Efficiency | Fuel cells wear out quickly and are challenging to regenerate, resulting in higher costs |
| Production | Hydrogen production methods may generate emissions, and the process of converting hydrogen to electricity results in energy loss |
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What You'll Learn
Hydrogen fuel cell cars vs. hydrogen internal combustion engine cars
Hydrogen fuel cell cars (HFCVs) are powered by an electric motor and are therefore classified as e-cars. They are fuelled with pure hydrogen gas stored in a tank on the vehicle. The hydrogen combines with oxygen in a fuel cell stack, an assembly of individual membrane electrodes, to produce electricity. The electricity powers the electric motor, and the only byproduct of this process is water vapour.
HFCVs have many of the same positive features as battery-electric cars: they are smooth, quiet, and peaceful to drive. They also lack the charging time problem that EVs have; it takes just five minutes or so to refuel them for another 300- to 400-mile stint. However, the availability of hydrogen fuel is a challenge. Hydrogen fuel cells are also happiest at a steady power output, making it difficult to accelerate onto a fast-moving highway. To solve this problem, some HFCVs include a high-voltage low-capacity battery, similar to those used in gasoline-electric hybrid vehicles, to supply supplemental power for short periods of intense acceleration.
Hydrogen internal combustion engine cars, on the other hand, use an internal combustion engine that runs on hydrogen instead of gasoline. These vehicles are not yet widely available, and information on how they work is scarce. However, they are likely to be similar to conventional internal combustion engine vehicles in terms of fuelling and driving range.
While both types of hydrogen cars have their advantages and disadvantages, it is important to note that hydrogen fuel cell cars are more common and have been on the market for longer. As of mid-2022, 17,000 or fewer hydrogen-powered vehicles were on the roads in the US, all of them in California, the only state with a network of retail hydrogen fuelling stations. Of these, the majority were the Toyota Mirai, the best-selling hydrogen car in the US. Honda has also produced the Clarity Fuel Cell model, and Hyundai has sold about 1600 Nexo SUVs in six years.
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Hydrogen fuel production and distribution
Hydrogen fuel can be produced from a variety of sources, including fossil fuels, biomass, and water through electrolysis using electricity. The most common method of hydrogen production is natural gas reforming, a thermal process that uses steam reforming to convert natural gas into hydrogen. This process is the cheapest, most efficient, and most common method, accounting for the majority of hydrogen production in the United States. However, it emits carbon dioxide, a greenhouse gas, and is known as gray hydrogen. If carbon capture and storage are implemented to remove carbon emissions, the resulting hydrogen is called blue hydrogen.
Electrolysis is another important method of hydrogen production, particularly for producing green hydrogen from renewable electricity sources such as solar or wind power. Green hydrogen can also be produced through biological processes using microbes such as bacteria and microalgae, which break down organic matter like biomass or wastewater to generate hydrogen. While producing green hydrogen is currently more expensive than gray hydrogen, ongoing research and development efforts are working to decrease costs associated with low-carbon hydrogen production.
Once hydrogen is produced, it needs to be distributed to fueling stations for use in vehicles. Currently, hydrogen distribution occurs through pipelines, high-pressure tube trailers, and liquefied hydrogen tankers. Pipelines are the least expensive method for delivering large volumes of hydrogen, but their capacity is limited to around 1,600 miles of pipelines in the United States. High-pressure tube trailers are used for transporting compressed hydrogen gas over short distances of 200 miles or less, but this method is expensive. Liquefied hydrogen tankers enable more efficient transportation over longer distances, but careful management of delivery and consumption rates is necessary to prevent evaporation.
The distribution and delivery of hydrogen to thousands of fueling stations present challenges due to the unique properties of hydrogen, such as its low energy per unit volume compared to other fuels. Building a new pipeline network for hydrogen requires high initial capital costs, and hydrogen's characteristics pose design challenges for pipeline materials and compressor design. Despite these challenges, the infrastructure for hydrogen distribution is being developed, with initial efforts focused on building distribution networks in California.
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Hydrogen fuel safety
Hydrogen fuel systems are designed with appropriate engineering controls and guidelines to ensure the safe handling and use of hydrogen. While no fuel is 100% safe, hydrogen has been shown to be safer than conventional fuels in several aspects. Firstly, hydrogen is not toxic, whereas conventional fuels are often toxic or contain toxic substances, including carcinogens. Secondly, hydrogen-powered vehicles only produce water vapour upon combustion, while the combustion of conventional fuels generates harmful air pollution. Thirdly, hydrogen leaks or spills do not contaminate the environment or threaten the health of humans or wildlife, unlike fossil fuels, which pose significant health and ecological threats when leaked, spilled, or combusted. Finally, hydrogen is much lighter than air, allowing for rapid dispersal in the event of a leak.
However, hydrogen does have some safety concerns. Hydrogen has a wide range of flammable concentrations in air and a lower ignition energy than gasoline or natural gas, making it easier to ignite. As a result, adequate ventilation and leak detection are crucial in the design of safe hydrogen systems. Hydrogen also burns with an almost invisible flame, requiring special flame detectors. Additionally, some metals can become brittle when exposed to hydrogen, so selecting the right materials is essential. Safety features and training in safe hydrogen handling practices are both key elements in ensuring the safe use of hydrogen.
The safety of hydrogen has been a topic of discussion for decades, and industry and government institutions have implemented robust safety protocols. The Hydrogen Industry Panel on Codes, the International Code Council, and the National Fire Protection Association collaborate to establish stringent standards for hydrogen systems and fuel cells. With ongoing research and development, hydrogen can become an even safer alternative to traditional fuels.
As hydrogen technology gains traction, it is important to continue prioritizing safety measures to ensure that it becomes a key part of a clean and thriving economy.
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Hydrogen fuel efficiency
Hydrogen fuel cells are an alternative energy source with a wide range of applications, from powering vehicles to providing electricity for critical infrastructure. Hydrogen fuel cell vehicles (FCEVs) are powered by an electric motor, and the electricity is produced by combining hydrogen and oxygen in the fuel cell. This process generates electrical energy without combustion, resulting in zero emissions and only water vapour and heat as by-products.
The efficiency of hydrogen fuel cells is impressive, with ratings of 40% to 60% according to the U.S. Department of Energy. This is a significant improvement over the 25% efficiency of traditional internal combustion engines. The high efficiency of hydrogen fuel cells means more energy output from the same amount of fuel, contributing to a cleaner and healthier environment.
One of the advantages of hydrogen fuel cells is their short refuelling time, which can be as quick as three to five minutes. This advantage, however, comes at a cost—the operating cost of hydrogen fuel cells is significantly higher than that of lithium-ion batteries. The cost of hydrogen fuel is also a factor, with a kilogram of hydrogen costing around 14 euros, although this price is expected to decrease with increased production.
The versatility of hydrogen fuel cells is another key benefit. Their modular design allows for scalability, making them adaptable to diverse energy demands. Hydrogen fuel cells can be used for emergency generators, vehicles, and large-scale power systems. Additionally, they eliminate the need for battery management, reducing labour, time, space, and peak power demands. Hydrogen fuel cells also offer notable operational durability, with some designs lasting over 20,000 hours.
In conclusion, hydrogen fuel cells offer a promising path towards a more sustainable and efficient energy future. With their high energy efficiency, environmental benefits, scalability, and reliability, they have the potential to shape the future of global power consumption and provide a clean alternative to conventional power sources.
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Hydrogen fuel cost
Hydrogen fuel cell vehicles (FCVs) are electric vehicles that use hydrogen fuel to power an electric motor. FCVs are zero-emissions vehicles, only emitting water vapour from their exhausts.
The cost of hydrogen fuel has been a challenge for FCVs, with high fuel costs due to hydrogen's unique physical properties. In California, hydrogen fuel has historically retailed for approximately $14 per kilogram, which is equivalent to $14 per gallon of gasoline. This is significantly more expensive than the average fuel economy of a gasoline car, which gets 30 miles per gallon, or a gasoline hybrid, which gets 42 miles per gallon.
The cost of hydrogen fuel has been increasing, with California's largest H2 fuel retailer, True Zero, recently hiking its price to $36 per kg. This has been unpopular with drivers, with some describing the move as "outrageous price gouging". The price increase has been attributed to "continued cost pressure on the hydrogen supply chain" and "low carbon credit values".
However, hydrogen advocates argue that FCVs' high fuel economy helps keep FCV fueling costs competitive with gasoline-fueled vehicles. The average FCV has a fuel economy of 60 miles per kg of hydrogen. The cost of hydrogen fuel is expected to decrease in the future due to higher volumes or greater economies of scale. For example, with increased hydrogen production, the price per kilogram in Germany could fall to €4-6 by 2030.
The availability of hydrogen fuel is also a challenge for FCV drivers, with a lack of hydrogen fuel stations in some areas, such as California, where there are currently less than 60 stations.
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Frequently asked questions
HFC stands for Hydrogen Fuel Cell. Hydrogen fuel cell cars are powered by an electric motor and are classified as e-cars.
HFC cars are fuelled with pure hydrogen gas stored in a tank on the vehicle. A nozzle from a fuel dispenser attaches to the receptacle on the vehicle to fill the tank.
A kilogram of hydrogen costs around 14 euros and a fuel cell car can travel about 100 kilometres on one kilogram of hydrogen.
HFC cars can be fuelled in about 5 minutes and have a driving range of more than 300 miles.
HFC cars produce no harmful tailpipe emissions, only water vapour and warm air. They are also smooth, quiet, and peaceful to drive.
