Sylvie Willis
Hydrogen fuel cell cars are electric vehicles that use hydrogen to power their electric motors. Unlike battery-powered electric cars, which store electricity in a large, heavy battery, hydrogen fuel cell cars generate their electricity using an onboard fuel cell. This fuel cell stack combines hydrogen and oxygen to produce electricity and water vapour, powering the car and making it emission-free. Hydrogen fuel cell cars can be refuelled in a similar time to conventional cars and can travel about 100km per kilogram of hydrogen, although hydrogen is currently expensive. Hydrogen fuel cell cars are much rarer than battery-powered electric vehicles, with only around 17,000 on US roads as of mid-2022.
| Characteristics | Values |
|---|---|
| Type of fuel | Hydrogen gas |
| Type of fuel cell | Polymer electrolyte membrane (PEM) fuel cell |
| Fuel storage | Carbon-fiber reinforced tanks |
| Fueling time | Less than 10 minutes |
| Driving range | 200-400 miles |
| Fuel cost | Around 14 euros per kilogram |
| Fuel efficiency | 100 kilometers per kilogram of hydrogen |
| Fueling infrastructure | Limited availability |
| Environmental impact | Zero tailpipe emissions, but production of hydrogen can lead to pollution |
| Vehicle power | Electric motor |
| Vehicle type | Electric vehicles (EVs) |
| Vehicle classification | Fuel Cell Electric Vehicles (FCEVs) |
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What You'll Learn
Hydrogen fuel cell cars use pure hydrogen gas
Hydrogen fuel cell cars are powered by an electric motor and are classified as e-cars. They are similar to conventional internal combustion engine vehicles and can be fuelled in about five minutes. They have a driving range of over 300 miles and are equipped with advanced technologies to increase efficiency, such as regenerative braking systems.
The crucial difference between hydrogen fuel cell cars and other electric vehicles is that hydrogen vehicles produce their own electricity. Hydrogen fuel cell cars use pure hydrogen gas, which is stored in a tank on the vehicle. Hydrogen is a highly efficient energy carrier, and in the fuel cell, it combines with oxygen to produce electricity and water vapour.
The process of converting hydrogen into electricity is complex. Firstly, hydrogen molecules break apart into protons and electrons due to an electrochemical reaction aided by a catalyst. The protons then travel through a membrane to the cathode, while the electrons are forced to travel through an external circuit, providing power to the electric motor. Finally, the electrons and protons recombine on the cathode side, where they combine with oxygen molecules to form water.
The construction of the fuel cell is similar to a battery, and the fuel cell stack is an assembly of individual membrane electrodes. The hydrogen gas is stored in reinforced carbon-fibre tanks, providing fuel to the fuel cell stack. The electric motor then powers the car using the energy produced in the fuel cell stack.
Hydrogen fuel cell cars are more expensive to refuel than conventional cars, but they are twice as efficient, travelling about twice as far on an equivalent amount of fuel.
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The gas is stored in carbon-fibre reinforced tanks
Hydrogen fuel cell cars are powered by an electric motor, using electricity generated by a fuel cell stack. This stack combines hydrogen and oxygen to produce electricity and power the car's electric motor. The hydrogen gas is stored in carbon-fibre reinforced tanks on board the vehicle, providing fuel to the fuel cell stack.
The carbon-fibre reinforced tanks are essential components of hydrogen fuel cell cars, as they store the pure hydrogen gas that powers the vehicle. These tanks are designed to be high-pressure, ensuring the hydrogen remains in a compressed gaseous state. The tank's carbon-fibre construction is crucial due to the unique characteristics of hydrogen. Hydrogen is the most abundant element in the universe, but it is never found in its pure state on Earth. It is always combined with other elements, and its small molecule size makes it challenging to store and transport.
Carbon fibre is a strong and lightweight material, making it ideal for containing high-pressure hydrogen gas. The carbon-fibre tanks are reinforced to withstand the pressure and safely store the hydrogen fuel. The size of the hydrogen fuel tank varies depending on the vehicle manufacturer's design and the desired power output. A larger tank can store more hydrogen, resulting in a longer driving range for the vehicle.
The process of refuelling a hydrogen fuel cell car is similar to that of a conventional car. The tank can be refuelled at a hydrogen fuelling station, and the process typically takes around five minutes. The cost of hydrogen fuel is currently high compared to gasoline, but as hydrogen production increases, prices are expected to decrease.
The use of carbon-fibre reinforced tanks in hydrogen fuel cell cars is a critical aspect of their design, allowing for the safe and efficient storage of hydrogen fuel, which powers the vehicle's electric motor and provides a driving experience comparable to traditional combustion engines in terms of range and performance.
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Hydrogen combines with oxygen to produce electricity
Hydrogen fuel cell cars are powered by an electric motor and are classified as e-cars. They are fuelled with pure hydrogen gas stored in a tank on the vehicle. Hydrogen fuel cell cars are zero-emission vehicles, emitting only water vapour from the exhaust pipe.
In a hydrogen fuel cell car, hydrogen combines with oxygen to produce electricity. This process occurs in the fuel cell stack, where hydrogen passes through a membrane to combine with oxygen from the air, generating electrical energy. This electricity then powers the car's electric motor.
The hydrogen molecules undergo an electrochemical reaction, aided by a catalyst, breaking apart into protons and electrons. The protons travel through the membrane to the cathode, while the electrons are forced to travel through an external circuit, providing power to the electric motor. At the cathode, the electrons recombine with the protons, and together with oxygen molecules, they form water.
The fuel cell stack is made up of numerous individual membrane electrodes that use hydrogen and oxygen to produce electricity. This assembly of fuel cells combines oxygen and hydrogen to generate electricity and power the electric motor.
The use of hydrogen as a fuel in cars offers several advantages, including reduced emissions, quieter operation, and high energy efficiency. However, hydrogen fuel cell cars have faced competition from battery-electric vehicles, and challenges related to the production and availability of hydrogen fuel.
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The electricity powers the car's electric motor
Hydrogen fuel cell cars are powered by an electric motor and are classified as e-cars. They are similar to conventional internal combustion engine vehicles in that they can be fuelled in about five minutes and have a driving range of over 300 miles.
The electricity that powers the car's electric motor is generated through a process that involves hydrogen and oxygen. Hydrogen is stored in tanks on board the vehicle. This hydrogen is then combined with oxygen from the air in a fuel cell stack, which produces electricity through an electrochemical reaction. This electricity is then used to power the car's electric motor.
The fuel cell stack is made up of an assembly of individual membrane electrodes, or fuel cells, that facilitate the process of generating electricity. Hydrogen molecules are broken down into protons and electrons due to an electrochemical reaction aided by a catalyst. The protons travel through a membrane to the cathode, while the electrons are forced to travel through an external circuit, providing power to the electric motor. The electrons then recombine with the protons on the cathode side, where they combine with oxygen molecules to form water. This water vapour is emitted through the exhaust, making the vehicle emission-free.
The power of the vehicle is defined by the size of the electric motor(s) that receives electric power from the fuel cell and battery combination. The battery in a hydrogen fuel cell vehicle is used to capture energy from regenerative braking and provide additional power to the electric motor. This is in contrast to a fully electric vehicle, where the amount of power and energy available are closely related to the battery's size.
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Hydrogen fuel cell cars are zero-emissions vehicles
Hydrogen fuel cell cars combine hydrogen and oxygen to produce electricity, which runs a motor. The hydrogen molecules break apart into protons and electrons due to an electrochemical reaction aided by a catalyst. The electrons are forced to travel through an external circuit to provide power to the electric motor, and then they recombine with the protons and oxygen molecules to form water vapour. This water vapour is the only waste product of the reaction and is emitted through the exhaust.
The process of converting hydrogen gas into electricity produces only water and heat as byproducts, meaning hydrogen fuel cell cars do not create tailpipe pollution when they are driven. However, it is important to note that producing the hydrogen itself can lead to pollution, including greenhouse gas emissions. The environmental impact of hydrogen production depends on the energy source used. If the electricity used to produce hydrogen comes from renewable sources, then hydrogen production has a neutral carbon footprint. However, if fossil fuels are used, it can have an adverse impact on the climate footprint of the vehicle.
Hydrogen fuel cell cars have a similar range and refueling process to conventional cars, making them suitable for long-distance travel. They can be refuelled at hydrogen refueling stations in under 10 minutes and have a driving range of more than 300 miles. They are also equipped with advanced technologies, such as regenerative braking systems, which capture the energy lost during braking and store it in a battery.
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Frequently asked questions
Hydrogen fuel cell cars use hydrogen gas as fuel. This hydrogen combines with oxygen to produce electricity, which is then used to power the car.
Hydrogen fuel cell cars use an electric motor powered by electricity generated in a fuel cell. The fuel cell combines hydrogen and oxygen to produce electricity, which then powers the car's electric motor. The tailpipe emissions are zero, and the only waste produced is pure water vapour.
Hydrogen fuel is obtained by "cracking" compounds like natural gas (CH4) into pure hydrogen (H2). This process requires a lot of energy and produces CO2 as a byproduct.
Hydrogen fuel cell cars can be refuelled at hydrogen refuelling stations, which are currently only available in California.
