Ameer Randolph
Hydrogen fuel cell vehicles (FCVs) are not as popular as electric vehicles (EVs) due to a variety of reasons. Firstly, hydrogen fuel cells are more expensive than batteries, and their production is not yet scalable enough to make them economically competitive. There is also a shortage of hydrogen refuelling stations, making FCVs less convenient and reducing demand. Additionally, hydrogen is a dangerous and explosive gas, and safety concerns have been raised about its use in cars. Furthermore, the process of producing pure hydrogen often creates carbon dioxide, which is a greenhouse gas. While FCVs can offer a long range of 300 to 400 miles on a single tank of hydrogen, the lack of infrastructure and high cost of hydrogen fuel cells are significant barriers to their widespread adoption.
| Characteristics | Values |
|---|---|
| Cost | Hydrogen fuel cells are expensive to produce and purchase. |
| Production | Producing pure hydrogen often creates carbon dioxide. |
| Refuelling | Hydrogen refuelling infrastructure is limited. |
| Safety | Hydrogen is a dangerously explosive gas. |
| Performance | Hydrogen fuel vehicles have a shorter range and are less durable than conventional cars. |
| Maintenance | Hydrogen is corrosive and leaks out of its container. |
| Competition | Electric vehicles are more established and have better infrastructure. |
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What You'll Learn
Hydrogen fuel cells are expensive to produce and not economically competitive
The high cost of fuel cells and the limited availability of hydrogen fueling stations have restricted the number of hydrogen-fueled vehicles on the road. People are hesitant to purchase hydrogen-fueled vehicles if hydrogen refueling stations are not readily accessible, and companies are reluctant to construct refueling stations without a customer base for hydrogen-fueled vehicles. This chicken-and-egg scenario has hindered the widespread adoption of hydrogen-fueled cars.
The cost of producing hydrogen fuel cells is expected to decrease over time, making them more economically competitive. Improvements in technology and production processes will likely drive down costs, making hydrogen fuel cells more affordable and accessible. Additionally, the development of a robust hydrogen refueling infrastructure will play a crucial role in reducing the cost burden associated with hydrogen-fueled vehicles.
While hydrogen fuel cells currently face economic challenges, they offer a clean and efficient alternative to conventional power sources. Hydrogen fuel cells have higher efficiency rates than internal combustion engines and power plants, with the potential to significantly reduce carbon dioxide emissions from the transportation sector. As governments strive for low and zero-emission transportation systems, hydrogen fuel cells are being explored for use in larger vehicles, such as delivery vans, trucks, buses, and trains.
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Hydrogen is hard to store and leaks out of any material
Hydrogen is the smallest molecule in existence and can easily pass through materials. Hydrogen also mixes readily with air, creating an ignitable mixture. This is especially dangerous when hydrogen accumulates in a confined area, as it can result in flames or explosions.
The highly flammable nature of hydrogen-air mixtures at concentrations above 4% has led to the development of hydrogen sensors with specific and concrete goals in mind. However, after more than a decade of research, these targets have not yet been met. Hydrogen leakage detection technologies have been developed or are being refined to meet the challenge of fast and reliable detection across a range of production and fueling environments. For example, chemochromic detection tape changes colour in less than three minutes at concentrations as low as 0.1% hydrogen in the air, well below the combustion threshold.
The difficulty of storing hydrogen cost-effectively is a significant challenge. Hydrogen tends to escape through the materials used, leaking out into the atmosphere. This has led to the exploration of graphene polymers, which have high 'barrier performance' or impermeability, as well as being extremely conductive. Graphene can be mixed with virgin polyethylene and other plastics to make these materials less permeable, opening up new possibilities for hydrogen storage and transportation.
The challenges of storing and transporting hydrogen, as well as the lack of infrastructure for delivering it across long distances, contribute to the reason why hydrogen-fueled cars are not yet widely adopted.
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Hydrogen refueling infrastructure is lacking
Hydrogen-powered cars are not yet mainstream, and one of the critical factors is the lack of a widespread and reliable hydrogen refueling infrastructure. While hydrogen fuel cell technology has advanced rapidly, deploying a sustainable and extensive refueling network is challenging.
As of 2023, California is the only state with a long-distance hydrogen refueling network, with 59 stations located primarily in Los Angeles and the Bay Area. This limited infrastructure restricts the range of hydrogen fuel cell vehicles, as refueling options outside of California are scarce. The development of additional hydrogen refueling stations across the United States is essential to support the wider adoption of hydrogen-fueled cars.
The deployment of hydrogen refueling infrastructure faces several methodological and practical challenges. Firstly, the design and cost of hydrogen stations must be integrated with production and delivery systems. Building a hydrogen refueling station is resource and time-intensive, with costs estimated at around $2 million per station. Secondly, the co-evolution of the refueling network and the demand for hydrogen fuel cell vehicles is crucial. Without sufficient demand for hydrogen vehicles, the economic viability of the refueling infrastructure is questionable.
Furthermore, the supply of hydrogen fuel at stations is inconsistent, with stations often running out of fuel for days at a time. This unreliable supply affects the convenience and dependability of hydrogen-fueled cars for consumers.
To address these challenges, the Biden administration has made significant investments through grants and incentives to encourage the development of hydrogen refueling infrastructure. The Department of Energy has awarded grants to support infrastructure plans in the Midwest corridor and between Houston and Los Angeles. Additionally, California has made substantial investments, with the California Energy Commission investing in an initial network of 100 public hydrogen stations. These efforts aim to support the wider adoption of hydrogen-fueled cars and achieve climate change goals.
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Hydrogen fuel cells are not energy efficient
The distribution of hydrogen fuel also presents challenges. Building a nationwide network of hydrogen fuel stations is a complex and costly undertaking. The current refueling infrastructure for hydrogen-fueled cars is limited, with California being the only state in the US with a long-distance hydrogen network. The reliability of fuel supply at these stations is also a concern, with stations often running out of fuel for extended periods.
Furthermore, hydrogen fuel cells themselves are expensive to manufacture. The cost of building and maintaining hydrogen stations needs to decrease to make hydrogen fuel cells more accessible and economically viable for consumers. The high cost of hydrogen fuel cells and the lack of widespread refueling infrastructure contribute to the overall inefficiency of the system.
While hydrogen fuel cells have the potential to be energy-efficient, with some claiming efficiencies greater than 60%, the challenges in production, distribution, and infrastructure limit their effectiveness. Hydrogen fuel cell vehicles also face competition from electric vehicles, which are becoming more prevalent and addressing issues with their charging infrastructure. As a result, hydrogen fuel cells are yet to become a widely adopted energy-efficient solution for vehicles.
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Hydrogen is a dangerously explosive gas
Hydrogen is a highly flammable gas with a wide range of explosive/ignition mix ranges with air. When fully mixed with air, hydrogen forms a large volume of gas cloud, and if ignited, a vapour cloud explosion (VCE) will occur. The flammability limits of hydrogen in the air range from 4% to 75%, and the detonation limits are narrower, from 18.3% to 59% at atmospheric pressure. The ignition temperature in the air is very low, at 585 °C, and the flame can reach a temperature of just over 2000 °C.
The main danger with cryogenic hydrogen is what is known as BLEVE (boiling liquid expanding vapour explosion). As hydrogen is gaseous in atmospheric conditions, the rapid phase change, along with the detonation energy, creates a highly hazardous situation. Another issue is that many materials change from being ductile to brittle at extremely cold temperatures, allowing new places for leaks to form. Hydrogen also has the ability to embrittle metals, which must be accounted for to ensure safe operation.
Hydrogen's buoyancy means that it tends to accumulate towards the ceilings and peaks of structures, rather than the floor. However, this danger may be mitigated by the fact that hydrogen rapidly rises and often disperses before ignition. In certain emergency or maintenance situations, hydrogen can be flared. For example, some hydrogen-powered vehicles can flare the fuel if the tank is on fire, burning out completely with little damage to the vehicle.
The storage and use of hydrogen pose unique challenges due to its ease of leaking, low-energy ignition, and wide range of combustible fuel-air mixtures. There are many codes and standards regarding hydrogen safety in storage, transport, and use, and safety procedures such as inerting chambers and purging gas lines are important when transferring hydrogen.
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Frequently asked questions
Hydrogen-fuelled cars are still in their infancy and are not yet widely available. They are also expensive to produce, and there is a lack of refuelling infrastructure.
The Toyota Mirai, a hydrogen fuel cell vehicle, has a starting price of $57,500. Hyundai's Tucson FCV is available to lease for $499 a month, plus $3,000 upfront.
Hydrogen fuel cells are a zero-emission option, with the only waste product being water vapour. However, the process of producing hydrogen often creates carbon dioxide. Hydrogen can also be a dangerously explosive gas.
Hydrogen fuel cell vehicles utilise hydrogen gas to generate electricity to power a motor that drives the car.
Hydrogen-fuelled cars can be refuelled much faster than electric cars, and they offer a comparable range of 300 to 400 miles. Hydrogen fuel cells are also lightweight and can be scaled up for larger vehicles without adding restrictive weight and size.
