Rajan Wilcox
Filling up a fuel cell car is a simple process that is not too different from fuelling a standard car. Fuel cell cars, also known as hydrogen fuel cell vehicles, use hydrogen gas and oxygen to generate electricity to power the vehicle. While hydrogen fueling stations are not as common as gas stations, they are becoming more widely available, particularly in California. At these stations, you can fill up your fuel cell car by connecting the vehicle's receptacle to the fuel dispenser nozzle. The process is relatively quick, taking around five minutes for a full tank of hydrogen, and it is also dirt-free, with no risk of leaks or drips.
| Characteristics | Values |
|---|---|
| Filling up a fuel cell car | Similar to filling up a standard car with gas |
| Time taken | Around 30 seconds longer than filling up a regular car |
| Hydrogen fueling stations | Located at existing gas stations |
| Hydrogen fueling stations | Found in California, New York, and Washington, D.C. |
| Hydrogen fueling stations | Funded in California for 100 more stations |
| Hydrogen fueling stations | Being developed in the Northeast |
| Hydrogen fueling stations | Located using the alternative fuel station locator website or an app |
| Hydrogen fueling stations | Found using the Hydrogen Fuel Cell Partnership website h2fcp.org |
| Hydrogen fueling | Requires connecting a communicator |
| Hydrogen fueling | Relatively dirt-free |
| Hydrogen fueling | Takes around 5 minutes or less to refuel a full tank |
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What You'll Learn
Hydrogen fueling stations
Filling up a fuel cell car at a hydrogen fuelling station is a straightforward process that is no more complicated or time-consuming than filling a standard car with gas. Hydrogen fuelling stations are already operational in California, with funding in place for 100 more. Stations are also being developed in the US Northeast, with eight states committing to putting 3.3 million zero-emission vehicles on the roads by 2025.
Most hydrogen fuelling stations are located at existing gas stations, with dispensers that look very similar to those of traditional gas pumps. However, hydrogen dispensers have a different nozzle and hose. The process involves locking the fuel dispenser onto the gas tank and letting the hydrogen flow. Refuelling a full tank of hydrogen takes roughly five minutes, similar to a gasoline tank.
The hydrogen storage tank pressure in your car is measured in MPa (megapascal). Newer refueling stations will only offer the 70 MPa option, suitable for light-weight vehicles. Older stations may also have a 35 MPa option for larger vehicles like buses, which have bigger tanks.
The Department of Energy's Fuel Cell Technologies Office is working to reduce the total cost of hydrogen fuel, including production and delivery, to less than $4/kg. Fuel cell electric vehicles (FCEVs) have a driving range of over 300 miles on a single tank of hydrogen.
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Hydrogen tank valves
Hydrogen fuel cell cars are well-known for being quiet, energy-efficient, and producing no emissions. They are also more cost-effective than conventional cars, as they can travel about twice as far on an equivalent amount of fuel.
Filling up a fuel cell car at a hydrogen fuelling station is not much different from fuelling a standard car with gas. Hydrogen fuelling stations are usually located at existing gas stations, with dispensers that look very similar but have different nozzles and hoses.
The hydrogen tank valves in a fuel cell car are an essential component of the fuel cell system. Valves are required to supply the gaseous fuel (usually hydrogen) at the inlet side and to remove any condensate at the outlet side. Typically, two types of valves are used: on/off valves and proportional valves. On/off valves are used to drain condensate, shut off the tank, or shut down the entire system. Proportional valves, on the other hand, control the flow rate of the gaseous fuel to the stack's inlet, adjusting the flow based on the power demand. These valves must be highly dynamic and responsive to ensure the stability and repeatability of the system.
In terms of valve requirements, it is crucial that the valves have low internal and external leakage to maintain a high level of process stability and reduce hydrogen consumption, even during standby mode. Additionally, the valves must be able to close safely under any circumstances, such as mechanical shock or power loss, and remain leakage-free afterward. During permanent operation, the valves should be energy-efficient and consume minimal energy.
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Hydrogen fueling process
The hydrogen fueling process for a fuel cell car is not complicated or time-consuming. In fact, it takes roughly the same amount of time as filling a standard car with gas. The process involves locking the fuel dispenser onto the gas tank of the car and letting the hydrogen flow. The hydrogen fuel nozzle locks onto the fuel receptacle before fueling begins. The fueling stations for hydrogen-powered cars are mostly located at existing gas stations, with California leading the way in the US. Other countries with hydrogen fueling stations include China, Japan, South Korea, and Germany.
Hydrogen fuel can be produced through several methods, including natural gas reforming, electrolysis, and solar-driven and biological processes. Natural gas reforming is a thermal process where steam reacts with a hydrocarbon fuel, such as natural gas, diesel, renewable liquid fuels, gasified coal, or gasified biomass, to produce hydrogen. Electrolysis involves using an electrolyzer to separate water into oxygen and hydrogen. Solar-driven processes use light as the agent for hydrogen production, with methods such as photobiological, photoelectrochemical, and solar thermochemical processes. Biological processes, on the other hand, use microbes such as bacteria and microalgae to produce hydrogen through biological reactions.
Hydrogen is a clean fuel, and when consumed in a fuel cell, it produces only water. It has a wide range of applications, including powering vehicles, electricity generation, and industrial processes. Hydrogen can also be liquefied and used as fuel in truck, rail, marine, and rocket engines.
The fueling process for a fuel cell car is straightforward and similar to that of a traditional gas-powered vehicle. The main difference lies in the type of fuel and the availability of hydrogen fueling stations, which are becoming more prevalent, especially in certain regions.
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Hydrogen storage tank pressure
To ensure safety, hydrogen storage tanks are designed with robust materials to withstand high pressures and prevent leakage. The inner liner of the tank is made from a high-molecular-weight polymer, acting as a hydrogen gas permeation barrier. A carbon fiber-reinforced or carbon fiber-epoxy resin composite shell is then added for strength and to bear the gas pressure load. An outer shell is also placed on the tank for impact and damage resistance. Additionally, hydrogen tanks are equipped with pressure relief devices to prevent excessive pressure build-up.
The method of hydrogen storage varies, with some manufacturers opting for open-space compression of H2 gas, while others use metal hydride technology. Metal hydrides store hydrogen in a porous material, releasing it through the addition of heat. However, this method has the drawback of adding weight to the vehicle, reducing its efficiency. Other experimental storage methods include the use of carbon nanotubes and doped metals like aluminium, which show promise for creating lightweight hydrogen storage tanks.
The pressure requirements of hydrogen storage tanks present challenges and opportunities for material choices. For instance, the lower operating pressure of cryo-compressed hydrogen (around 300 bar) reduces the need for costly carbon fiber composites, making it a preferred option. On the other hand, insulation is a critical consideration for cryogenic storage, with vacuum-jacketed systems and rigid closed-cell foam insulation being common approaches to maintaining low temperatures.
Overall, the pressure within hydrogen storage tanks is a critical factor in the performance and safety of fuel cell cars. Scientists and researchers are actively working to optimise tank pressure, improve storage methods, and reduce costs to enhance the viability of hydrogen-powered vehicles in the marketplace.
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Hydrogen fuel costs
Filling up a fuel cell car at a hydrogen fuelling station is similar to fuelling a standard car with gas. Most hydrogen fuelling stations are located at existing gas stations and use similar dispensers with different nozzles and hoses. The process of refuelling a fuel cell car takes roughly five minutes or less, the same as fuelling a gasoline car.
The cost of hydrogen fuel is a significant factor influencing the adoption of hydrogen-powered vehicles. While the vehicles themselves are not the primary obstacle, the high price of hydrogen fuel is a barrier for many potential users. In California, hydrogen fuel is generally priced at about $25 per kilogram, which means it would cost approximately $135 to fill up a standard car. At this price point, hydrogen fuel is not considered price-competitive, and consumers may be hesitant to adopt hydrogen-powered vehicles, even if they are given for free.
To address this challenge, efforts are being made to drive down the total cost of hydrogen fuel, including production and delivery. The US Department of Energy's Fuel Cell Technologies Office has funded research and development to reduce the cost of hydrogen fuel to less than $4/kg by 2020. However, even with these efforts, the cost of hydrogen fuel remains a challenge.
Industry experts have suggested that hydrogen fuel needs to be priced much lower, closer to $10 per kilogram or even $6 per kilogram, to become a desired and viable power source for electric vehicles. The high cost of hydrogen fuel is attributed to the need for increased hydrogen production and the development of an infrastructure network to store and distribute the fuel.
Despite the current high costs, hydrogen fuel has advantages over battery-electric power due to its longer ranges and lighter weight, making it an attractive option for zero-emission heavy-duty vehicles. As a result, several states, including California, are mandating the conversion of trucking and fleets to zero-emission alternatives, driving the need for more affordable hydrogen fuel and an expanded refuelling infrastructure.
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Frequently asked questions
Hydrogen fueling stations are already available in California, New York, and Washington, D.C. Stations are also being developed in the Northeast as part of an agreement between eight states to put 3.3 million zero-emission vehicles on the roads by 2025. You can find a list of hydrogen stations on the alternative fuel station locator website or app.
Filling up a fuel cell car with hydrogen is a simple process. It only requires one extra step compared to filling up a car with gas or diesel: connecting the communicator. This step is being eliminated as stations adopt hydrogen-hose assemblies with integrated communicator devices. After connecting the communicator, you attach the nozzle from a fuel dispenser to the receptacle on your vehicle to fill the tank.
Refueling a fuel cell car with hydrogen takes roughly the same time as refueling a gasoline tank—five minutes or less for a full tank.
