Katerina Swanson
Hydrogen fuel cell vehicles are an exciting prospect for those seeking an alternative to traditional combustion engines. With only around 17,000 hydrogen-powered vehicles on US roads, they are much rarer than electric vehicles, but they offer some unique advantages. Hydrogen fuel cell vehicles are powered by an electric motor, but unlike electric vehicles, they produce their own electricity. This is achieved by converting the chemical energy of hydrogen to mechanical energy, which powers the vehicle's electric motors. So, do hydrogen fuel cell vehicles have gearboxes?
| Characteristics | Values |
|---|---|
| Number of hydrogen-powered vehicles in the U.S. | 17,000 |
| Number of hydrogen-powered vehicles in California | All of the above |
| Hydrogen-powered vehicles currently on the market | Honda CR-V e:FCEV, Toyota Mirai, Hyundai Nexo |
| Hydrogen-powered vehicles no longer on the market | Honda Clarity, Honda Clarity Fuel Cell |
| Best-selling hydrogen car in the U.S. | Toyota Mirai |
| Power of the Toyota Mirai | 90 kW (120 horsepower) |
| Range of hydrogen cars | 300-400 miles |
| Refueling time | 5 minutes |
| Tailpipe emissions | Zero |
| Safety | Hydrogen is flammable and prone to spontaneous combustion if leaked |
| Cost | More expensive than comparable conventional cars |
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What You'll Learn
- Hydrogen fuel cell vehicles are quiet, efficient and produce no harmful emissions
- Hydrogen cars are powered by an electric motor and are classified as e-cars
- Hydrogen vehicles have a similar range to e-cars with large battery storage
- Hydrogen fuel is hazardous due to its low ignition energy and high combustion energy
- Hydrogen vehicles have pros and cons when compared to electric vehicles
Hydrogen fuel cell vehicles are quiet, efficient and produce no harmful emissions
Hydrogen fuel cell vehicles are a type of electric car that uses hydrogen to generate electricity and power the vehicle. They are distinct from battery-powered or plug-in hybrid cars, which rely on electricity from an external power source to charge their built-in batteries.
One of the key advantages of hydrogen fuel cell vehicles is their quietness. These cars produce significantly less noise compared to traditional combustion engines, making for a smoother and more peaceful driving experience.
Another significant benefit of hydrogen fuel cell technology is its efficiency. Hydrogen fuel cells have a similar range to electric vehicles with large battery storage. A single refuelling of a hydrogen fuel cell vehicle can provide a range of 300 to 500 kilometres, or 300 to 400 miles, which is comparable to the range of gasoline-powered cars. Additionally, hydrogen fuel cell vehicles do not suffer from reduced range in cold weather, a problem often faced by electric vehicles. The efficiency of hydrogen fuel cells also extends to refuelling times. Refuelling a hydrogen fuel cell vehicle typically takes only around five minutes, eliminating the long charging times associated with electric vehicles.
The environmental benefits of hydrogen fuel cell vehicles are also noteworthy. These vehicles produce no harmful tailpipe emissions, only emitting water vapour. This makes them a zero-emission vehicle option, which can help reduce carbon emissions and localised air pollution from transportation.
While hydrogen fuel cell vehicles offer several advantages, there are also some challenges and drawbacks to consider. One of the primary concerns is the availability of hydrogen fuel. The limited number of hydrogen fuelling stations can make it difficult for drivers to access refuelling options. Additionally, hydrogen fuel is generally more expensive than gasoline, and the production and transportation of hydrogen can result in high carbon emissions if it is not produced cleanly. Furthermore, the small size of hydrogen molecules makes it challenging to store and transport, and there are safety concerns due to the flammability of hydrogen.
Despite these challenges, hydrogen fuel cell vehicles present an exciting opportunity for the future of transportation. With their quiet operation, efficiency, and zero-emission benefits, they have the potential to play a significant role in reducing our reliance on fossil fuels and improving air quality.
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Hydrogen cars are powered by an electric motor and are classified as e-cars
Hydrogen fuel cell cars are powered by an electric motor and are therefore classified as e-cars. They are related to electric cars but have unique pros and cons that set them apart. For instance, hydrogen-powered vehicles are much rarer than electric cars, with only about 17,000 such vehicles on US roads, all of which are in California.
Hydrogen fuel cell cars are powered by the most abundant element in the universe: hydrogen. They run on electricity, but their method of generating it differs from that of battery-powered or plug-in hybrid cars. Hydrogen fuel cell cars are powered by compressed hydrogen gas, which feeds into an onboard fuel cell stack. This fuel cell doesn't burn the gas but instead transforms the fuel's chemical energy into electrical energy, which powers the car's electric motors.
The construction of the fuel cell is similar to a battery. Hydrogen enters the anode, where it comes into contact with a catalyst that promotes the separation of hydrogen atoms into electrons and protons. The electrons are gathered by the conductive current collector, which is connected to the car's high-voltage circuitry, powering the onboard battery and/or the motors. This process produces zero tailpipe emissions, with the only waste product being pure water.
The power of a hydrogen fuel cell vehicle is defined by the size of its electric motor(s), which receives electric power from the appropriately sized fuel cell and battery combination. The amount of energy stored on board is determined by the size of the hydrogen fuel tank, which can typically provide a range of 300-400 miles. Unlike electric vehicles, which depend on charging infrastructure, hydrogen fuel cell vehicles can be refuelled in a similar manner to traditional gas-powered cars, typically in under five minutes.
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Hydrogen vehicles have a similar range to e-cars with large battery storage
Hydrogen fuel cell vehicles (FCEVs) are electric cars that use a fuel cell and pressurised tanks of hydrogen gas instead of a rechargeable battery pack. They are powered by the most abundant element in the universe: hydrogen. In a fuel cell, hydrogen reacts electrochemically to produce electricity to power the car.
Hydrogen cars, on the other hand, have a range of 400 to 600 miles, depending on the tank size. The Toyota Mirai, the best-selling hydrogen car in the US, has an official range of 357-402 miles. That's further than most electric cars will go on a charge. The three hydrogen cars sold in recent years all have EPA-rated ranges of 300 miles or more, though, like EVs, that range falls substantially at higher speeds.
While hydrogen cars have a similar range to e-cars with large battery storage, they have the added benefit of a much faster refuelling time. It takes only a few minutes to refill a hydrogen gas tank, compared to the hours it can take to recharge an electric vehicle's battery. This is because hydrogen cars do not need to be plugged in to recharge; they are refuelled in the same way as petrol or diesel cars.
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Hydrogen fuel is hazardous due to its low ignition energy and high combustion energy
Hydrogen fuel cell vehicles are related to electric cars but are very different in their pros and cons. Hydrogen fuel cells emit only water vapour and do not suffer from the long charging times of electric vehicles. However, hydrogen fuel is hazardous, with a low ignition energy and high combustion energy.
Hydrogen has a wide range of flammable concentrations in air and a lower ignition energy than gasoline or natural gas, meaning it can ignite more easily. Hydrogen also has one of the widest explosive/ignition mix ranges with air of all gases, with only a few exceptions such as acetylene, silane, and ethylene oxide. Ignition can occur at a volumetric ratio of hydrogen to air as low as 4% due to the oxygen in the air and the simplicity and chemical properties of the reaction. This means that a hydrogen leak in an enclosed space will most likely lead to an explosion, not just a flame.
The minimum ignition energy of hydrogen in air is one of the lowest among known substances at 0.02 mJ, and hydrogen-air mixtures can ignite with just 1/10 the effort of igniting gasoline-air mixtures. This means that any possible ignition source must be scrutinized, and any potential sources of static electricity build-up, such as some ventilation system designs, should be minimized through the use of antistatic devices.
Liquid hydrogen poses additional challenges due to its increased density and the extremely low temperatures needed to keep it in liquid form. It is difficult to maintain these low temperatures, and the hydrogen will gradually leak away, evaporating at a rate of 1% per day. The main danger with cryogenic hydrogen is what is known as BLEVE (boiling liquid expanding vapor explosion). Because hydrogen is gaseous in atmospheric conditions, the rapid phase change, along with the detonation energy, creates a more hazardous situation.
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Hydrogen vehicles have pros and cons when compared to electric vehicles
Hydrogen fuel cell vehicles (HFCVs) and electric vehicles (EVs) are both zero-emission vehicle alternatives to traditional gasoline and diesel vehicles. They are both powered by electricity and have similar positive features, including being smooth, quiet, and peaceful to drive. However, they also have distinct pros and cons that set them apart.
One of the main advantages of HFCVs over EVs is their faster refuelling time. It only takes around three to five minutes to refill a hydrogen fuel tank, which is comparable to the time it takes to refuel a petrol or diesel car. In contrast, recharging an EV battery, even with an ultra-rapid charger, typically takes much longer, often under half an hour to charge from 10% to 80%. Additionally, HFCVs offer longer ranges, with a single tank of hydrogen fuel providing a range of 300 to 400 miles, while EVs tend to have shorter ranges, and their range decreases significantly at higher speeds.
However, one of the significant disadvantages of HFCVs compared to EVs is the limited availability of hydrogen fuel infrastructure. The number of hydrogen filling stations is relatively low, and not all stations are operational at all times. This limited infrastructure can make refuelling HFCVs less convenient and accessible. On the other hand, EVs benefit from a more established infrastructure, with charging stations widely available and supported by government initiatives, making them more attractive to consumers.
Another challenge for HFCVs is the higher production costs and complex refuelling infrastructure. Hydrogen cars tend to be more expensive to purchase than EVs, and the cost of hydrogen production remains high, impacting the overall operating costs. In contrast, EVs have benefited from advancements in technology and existing infrastructure, making them more affordable to buy and run for many consumers.
While both HFCVs and EVs offer zero-tailpipe emissions, their environmental impact depends on how the electricity or hydrogen fuel is produced. Hydrogen production can sometimes involve natural gas, leading to CO2 emissions, while EVs can be powered by renewable energy sources, reducing their carbon footprint. Therefore, the environmental advantages of HFCVs are contingent on advancements in hydrogen production methods to make them truly sustainable.
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Frequently asked questions
Hydrogen fuel cars are powered by an electric motor and are classified as e-cars. They are similar to electric cars but have some pros and cons that make them different. Hydrogen fuel cars do not have a gearbox.
Hydrogen fuel cars are powered by compressed hydrogen gas that feeds into an onboard fuel cell stack. This fuel cell stack transforms the fuel's chemical energy into electrical energy, which powers the car's electric motors.
Hydrogen fuel cars are quiet, very energy-efficient, produce no emissions, and have a similar range and performance to gasoline cars. They also lack the charging time problem that electric vehicles have and can be refuelled in a matter of minutes.
Hydrogen fuel is hazardous due to its low ignition energy and high combustion energy. It is also prone to leaking from tanks due to its small molecular size. Hydrogen fuel cars are also more expensive than comparable conventional cars.
As of 2021, there were two models of hydrogen cars publicly available: the Toyota Mirai and the Hyundai Nexo. The Honda CR-V e:FCEV was also made available for lease in 2024, but in very limited quantities.
