Mercedes Mullins
Hydrogen fuel cell cars are an increasingly popular alternative to traditionally powered cars. Hydrogen-powered fuel cells are a viable power source for everyday vehicles, with examples including the Chevrolet Equinox fuel cell and the Honda FCX Clarity. Despite this, hydrogen refuelling infrastructure is not widely available, and the process of refuelling a hydrogen fuel cell car remains a mystery to many. This guide will take you through the process of refuelling a hydrogen fuel cell car, including the steps to follow and the safety precautions to be aware of.
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What You'll Learn
- Refilling a hydrogen fuel cell car is similar to refuelling a traditional car
- Hydrogen gas is stored in a high-pressure storage tank at refilling stations
- Hydrogen fuel cell vehicles are not completely unlike electric vehicles
- Hydrogen gas is the most abundant element in the universe, but there aren't many places to pump it
- Green hydrogen is produced using electrolysis powered by renewable energy
Refilling a hydrogen fuel cell car is similar to refuelling a traditional car
Firstly, bring the vehicle to a complete stop with the hydrogen dispenser facing the nearside of the vehicle. Remove the plastic dust cap from the vehicle's hydrogen receptacle and store it in the holder built into the fuel filler door. Push the end of the dispenser onto the vehicle's hydrogen receptacle and pull up on the handle to lock the connection.
Follow the instructions on the supply station to fill the hydrogen tank. You do not need to hold the dispenser in place while the tank is being filled. The end of the nozzle and the vehicle receptacle will become cold and may frost over due to the high-pressure liquid gas being supplied. Therefore, do not touch these metal surfaces.
When refuelling is complete, release the dispenser's catch to unlock it from the vehicle. If the dispenser feels stuck, it may be frozen in place.
While the process of refuelling is similar to that of a traditional car, there are some differences in the fuel itself. Hydrogen gas is the most abundant element in the universe, but there are not many places to pump it as it is not as common as petrol or diesel. Hydrogen is captured and packaged on-site at the station, extracted from the station's supply of water. The pump price of hydrogen is quoted at around $5 per kilogram, and it is difficult to estimate the future cost of hydrogen accurately due to the current lack of volume and infrastructure. However, studies predict the price will level off between $2 and $4 per kilogram, and a kilogram of H2 typically provides more range than a gallon of gas. Hydrogen is also a very safe fuel as it dissipates quickly if it escapes and requires the right amount of air, hydrogen, and a spark to ignite. To be truly emission-free, the hydrogen must be green, produced using electrolysis powered by renewable energy.
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Hydrogen gas is stored in a high-pressure storage tank at refilling stations
Hydrogen refuelling stations (HRS) are facilities where hydrogen fuel cell vehicles can be refuelled. Hydrogen gas is stored in high-pressure storage tanks at these refilling stations, ready to be dispensed into vehicles. The process of refuelling a hydrogen fuel cell car is similar to that of a traditional petrol or diesel car, but there are some key differences in the backend operations of the refuelling station.
Hydrogen gas is stored in high-pressure tanks at HRS, typically at pressures of 350 bar or 700 bar, depending on the type of vehicle being refuelled. The high pressure allows a greater amount of hydrogen to be stored in the system and enables an efficient flow of gas for dispensing. The storage tanks are equipped with specially designed valves, fittings, and electrical controls to regulate pressure and interact with the dispenser and vehicle.
There are two main types of hydrogen refuelling stations: those that produce hydrogen on-site and those that receive hydrogen from an external source. On-site production is typically achieved through electrolysis, while off-site stations may receive hydrogen through road transport or specific pipelines. The hydrogen is then compressed to increase pressure and reduce volume, enhancing storage capacity and dispensing efficiency.
The hydrogen refuelling process for a car involves bringing the vehicle to a complete stop, ensuring the hydrogen dispenser is rated for the correct pressure, and connecting the dispenser to the vehicle's hydrogen receptacle. As the liquid gas is supplied at high pressure, the nozzle and vehicle receptacle may become cold and frosty. It is important not to touch these metal surfaces. The entire refuelling process for a typical hydrogen car takes around three minutes.
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Hydrogen fuel cell vehicles are not completely unlike electric vehicles
Hydrogen fuel cell vehicles and electric vehicles (EVs) are similar in that they are both zero-emissions vehicles, offering a cleaner alternative to traditional gasoline- or diesel-powered cars. They are also comparable in terms of the refueling process, which involves visiting a dedicated filling station and connecting the vehicle to a dispenser.
Hydrogen fuel cell vehicles, like electric cars, are powered by electricity. In the case of the former, hydrogen gas is released from a tank and comes into contact with the anode and cathode in the fuel cells. This electrochemical reaction between the anode and cathode breaks the hydrogen molecules into protons (water) and electrons (electricity), which is then stored in a battery to power the car. This electricity is passed down to the motor that moves the wheels. Electric vehicles, on the other hand, use an electric motor driven by an electric current stored in a lithium-ion battery.
Both types of vehicles have their own advantages. Hydrogen fuel cell vehicles offer a better driving range, typically between 400 and 600 miles, compared to 150 to 375 miles for EVs. Additionally, refueling a hydrogen-powered vehicle is quicker, taking only 5 to 10 minutes, while electric vehicles can take 4 to 8 hours to fully charge. However, electric vehicles are generally more affordable, with a wider range of charging stations available.
Despite these similarities and advantages, electric vehicles have gained more traction in the market. This can be attributed to factors such as the higher cost of hydrogen fuel and the limited infrastructure for refueling hydrogen-powered vehicles. As of 2023, there were over 1000 refueling stations for hydrogen cars globally, whereas electric vehicles benefit from a vast, existing electrical system with numerous charging stations.
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Hydrogen gas is the most abundant element in the universe, but there aren't many places to pump it
Currently, hydrogen refuelling stations are mostly found in California, with a few in New York, Washington, D.C., and Hawaii. To refuel a hydrogen-powered car, you would bring the vehicle to a complete stop with the hydrogen dispenser facing the nearside of the vehicle. You would then close all windows, shift the transmission selector to Park, and turn off the power. It is important to ensure that the hydrogen dispenser is H70 rated, offering a supply pressure of 70MPa (700 bar). A full refuel will not be possible if the pressure inside the hydrogen storage tanks is higher than the supply pressure from the hydrogen station.
Next, you would remove the plastic dust cap covering the vehicle's hydrogen receptacle and store it in the holder built into the fuel filler door. The hydrogen dispenser looks similar to a traditional petrol or diesel dispenser. You would then push the end of the dispenser straight onto the vehicle's hydrogen receptacle and pull up on the integral handle to lock the connection into place. A gentle pull on the dispenser will ensure it is secure.
Once the connection is secure, you can follow the instructions on the supply station to fill the hydrogen tank. You do not need to hold the dispenser to do this. As the liquid gas is supplied at high pressure, the end of the nozzle and vehicle receptacle will become cold and may develop some frost. It is important not to touch these metal surfaces. When refuelling is complete, you can release the catch on the handle to unlock the dispenser from the vehicle. If the dispenser feels like it is stuck, it may be frozen in place.
While the infrastructure for hydrogen fuelling is still developing, initiatives such as the National Alternative Fuels Corridors grant program and the Inflation Reduction Act of 2022 are helping to expand the market for hydrogen fuel and stabilize its price. Mobile hydrogen fuelling stations, where liquefied or compressed hydrogen and dispensing equipment are stored onboard a trailer, are also being developed to support the expansion of hydrogen infrastructure.
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Green hydrogen is produced using electrolysis powered by renewable energy
Producing green hydrogen using electrolysis powered by renewable energy is a key solution to achieving global decarbonization goals. Electrolysis is the process of using electricity to split water into hydrogen and oxygen. This method of hydrogen production is carbon-free and can be powered by renewable energy sources such as wind, solar, and nuclear energy.
The process of electrolysis takes place in a unit called an electrolyzer, which can vary in size from small, appliance-size equipment to large-scale, central production facilities. Electrolyzers consist of an anode and a cathode separated by an electrolyte, with different types of electrolyzers using different electrolyte materials. For example, a polymer electrolyte membrane (PEM) electrolyzer uses a solid specialty plastic material as the electrolyte.
The integration of renewable energy with electrolysis to produce green hydrogen offers opportunities for synergy with dynamic and intermittent power generation. For instance, at a wind farm, hydrogen production through electrolysis can be increased during times of excess electricity production, rather than curtailing the electricity as is commonly done. This flexibility allows for a better match between resource availability and system operational needs.
Research has demonstrated the potential for substantial reductions in the cost and energy requirements of hydrogen production by optimizing electrolyzer design and operation. These advancements in electrolysis technologies provide a strategy for scaling up green hydrogen as a sustainable energy carrier, contributing to global efforts to reduce greenhouse gas emissions and advance toward carbon neutrality.
As for refilling a hydrogen fuel cell car, the process is quite simple and similar to refuelling a traditional petrol or diesel car. First, bring the vehicle to a complete stop with the hydrogen dispenser facing the nearside of the vehicle. Remove the plastic dust cap covering the vehicle's hydrogen receptacle and store it in the holder built into the fuel filler door. Close all windows, shift the transmission selector to Park, and turn off the power. Ensure the hydrogen dispenser is H70 rated, offering a supply pressure of 70MPa (700 bar). A full refuel will not be possible if the pressure inside the hydrogen storage tanks is higher than the supply pressure from the hydrogen station.
Next, push the end of the dispenser straight onto the vehicle's hydrogen receptacle and pull up on the integral handle to lock the connection in place. A gentle pull on the dispenser will ensure it is secure. Follow the instructions on the supply station to fill the hydrogen tank; there is no need to hold the dispenser. The metal surfaces of the nozzle and vehicle receptacle will become cold and may frost over, so do not touch them. When refuelling is complete, release the catch on the handle to unlock the dispenser from the vehicle. If the dispenser feels stuck, it may be frozen in place.
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Frequently asked questions
Refilling a hydrogen fuel cell car is similar to refuelling a car with gas or diesel. Hydrogen can be pumped into a vehicle's fuel tank at a hydrogen fuelling station.
Hydrogen fuelling stations are currently limited to select areas, such as Southern California, New York, and Washington, D.C. However, there are plans to expand the infrastructure and make it more widely available. You can find hydrogen fuelling stations in the United States and Canada using online resources.
Refuelling time for hydrogen fuel cell cars is comparable to that of conventional vehicles. While a full tank refill can take up to 30 minutes, some stations can provide a quicker refuel, with a 4.2-kg fill in about four minutes.
The cost of hydrogen fuel varies, and the price quoted at a pump was $5 per kilogram. However, studies predict that the price will stabilise between $2 and $4 per kilogram. As the volume and infrastructure for hydrogen fuelling mature, the cost is expected to become more competitive with gasoline.
Hydrogen fuel cell vehicles offer several advantages over battery-electric cars. They have a longer range, typically covering 250-350 miles on a full tank, and refuelling is faster and more convenient since they are not tethered to charging cords. Additionally, hydrogen fuel cells produce zero pollution and greenhouse gases, making them a more environmentally friendly option.
