Mercedes Mullins
Hydrogen fuel cell vehicles (HFCVs) are a type of electric car that uses hydrogen as an energy carrier to produce electricity and power the motor. Unlike conventional cars that run on gasoline or diesel, hydrogen fuel cell cars combine hydrogen and oxygen to produce electricity, resulting in only water vapour and heat as byproducts. This makes them a zero-emission vehicle option, with similar range and refuelling processes to conventional cars. Hydrogen can be produced from various sources, including natural gas, nuclear power, biomass, and renewable power, making it an attractive fuel option for transportation. However, hydrogen cars are much rarer than electric vehicles, with a smaller number available on the market and a more limited refuelling infrastructure.
Why Hydrogen as a Source of Fuel in Cars
| Characteristics | Values |
|---|---|
| Environmental Impact | Hydrogen fuel cells produce only water and heat as byproducts, resulting in zero tailpipe emissions. However, the process of producing hydrogen can lead to pollution and greenhouse gas emissions. |
| Refueling | Hydrogen fuel cell vehicles can be refueled at specialized hydrogen refueling stations, with a refueling time of less than 10 minutes, similar to conventional cars. |
| Driving Range | Hydrogen-powered vehicles offer a driving range of 200-300 miles, comparable to that of gasoline or diesel-only vehicles. |
| Electricity Generation | Hydrogen fuel cells generate electricity by combining hydrogen and oxygen, with the hydrogen typically stored in tanks in the car and oxygen drawn from the ambient air. |
| Power Source | Hydrogen vehicles produce their own electricity, unlike purely electric vehicles that rely on built-in batteries or external power sources. |
| Efficiency | The efficiency of the hydrogen energy chain, from production to vehicle operation, is lower than that of battery-electric vehicles (BEVs). However, hydrogen can be produced using renewable energy sources, such as wind or solar power. |
| Cost | Hydrogen fuel cell vehicles currently have higher costs compared to equivalent battery-electric or internal combustion engine vehicles. |
| Infrastructure | The infrastructure for hydrogen refueling stations is expanding worldwide, with initiatives like California's Advanced Clean Cars Program promoting the development of publicly accessible stations. |
| Safety | Hydrogen has a strong propensity to bind with other elements, making it a good energy carrier. However, using hydrogen in existing natural gas infrastructure and combustion equipment poses challenges related to materials compatibility and combustion characteristics. |
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What You'll Learn
Hydrogen fuel cells produce electricity with zero emissions
Hydrogen fuel cells are an efficient and clean source of energy that can be used in cars, with water vapour being the only emission. This makes hydrogen fuel cells a zero-emissions energy source, addressing critical climate challenges as there are no carbon dioxide emissions.
Hydrogen fuel cells work by using the chemical energy of hydrogen to cleanly and efficiently produce electricity. Hydrogen is fed to the anode, and air is fed to the cathode. At the anode, a catalyst separates the hydrogen molecules into protons and electrons. The electrons go through an external circuit, creating a flow of electricity, while the protons migrate through the electrolyte to the cathode, where they unite with oxygen and the electrons to produce water and heat. This process is similar to how a battery works, but unlike batteries, fuel cells do not need recharging and produce electricity and heat as long as fuel is supplied.
Hydrogen fuel cells are more efficient than traditional internal combustion engines as they convert chemical energy directly into electrical energy, reducing energy loss from heat. Hydrogen fuel cells are also lightweight, which makes them suitable for larger vehicles where battery weight could be prohibitive. They can also be refuelled quickly, making them ideal for long-haul trucking where minimising downtime is crucial.
Hydrogen fuel cells can be powered by hydrogen produced from a variety of domestic resources, such as natural gas, nuclear power, biomass, and renewable power like solar and wind. This makes hydrogen an attractive fuel option for transportation as it can reduce dependence on imported oil. However, hydrogen fuel cells also face challenges such as the high cost of fuel cells and the limited availability of hydrogen refuelling stations, which have restricted the number of hydrogen-fuelled vehicles in use today.
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Hydrogen is an energy carrier, not a fuel
Hydrogen is the simplest and most abundant element on Earth, consisting of just one proton and one electron. It is a clean fuel that, when consumed in a fuel cell, produces only water, electricity, and heat. Hydrogen can be produced from a variety of sources, including natural gas, nuclear power, biomass, and renewable power like solar and wind. These qualities make it an attractive fuel option for transportation and electricity generation applications.
While hydrogen is often referred to as a fuel, scientists consider it an energy carrier. Hydrogen can store and deliver usable energy but does not typically exist by itself in nature; it must be produced from compounds that contain it. Its strong propensity to bind with other elements makes it a good energy carrier. Creating pure hydrogen for vehicles requires using a significant amount of energy to "crack" a compound like natural gas (CH4) into pure H2, with CO2 as a byproduct.
Hydrogen fuel can be produced through several methods, including natural gas reforming (a thermal process), electrolysis, and solar-driven and biological processes. Electrolysis involves separating water into oxygen and hydrogen through a process called electrolysis, which takes place in an electrolyzer. Solar-driven processes use light as the agent for hydrogen production, including photobiological, photoelectrochemical, and solar thermochemical processes. Photobiological processes use the natural photosynthetic activity of bacteria and green algae to produce hydrogen, while photoelectrochemical processes use specialized semiconductors to separate water into hydrogen and oxygen.
Biological processes use microbes such as bacteria and microalgae to produce hydrogen through biological reactions. In microbial biomass conversion, microbes break down organic matter like biomass or wastewater to produce hydrogen, while in photobiological processes, they use sunlight as the energy source.
Hydrogen fuel cells have the potential to significantly reduce emissions in various applications, including light-duty highway vehicles, specialty vehicles, transit buses, and auxiliary power units. However, the greatest challenge for hydrogen production, especially from renewable resources, is cost. To make hydrogen cost-competitive with conventional fuels, research is focused on improving the efficiency and lifetime of hydrogen production technologies, as well as reducing capital and operational costs.
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Hydrogen cars are electric vehicles
Hydrogen fuel cell vehicles (HFCVs) are electric vehicles that use hydrogen as an energy carrier to power their electric motors. While they are related to electric cars, they have distinct pros and cons that set them apart.
HFCVs use a fuel-cell stack, where hydrogen reacts with oxygen from the air to produce electricity, turning the wheels and emitting only water vapour. This process is different from battery-powered or plug-in hybrid cars, which rely on large, heavy batteries. HFCVs are refuelled at hydrogen fuelling stations, similar to traditional gas stations, and offer a quick five-minute refuelling time.
The driving experience of an HFCV is comparable to that of a battery-electric vehicle. They are known for being smooth, quiet, and peaceful, with regenerative braking systems that recapture wasted energy during deceleration. However, HFCVs face challenges in meeting the varying power demands of average cars, as hydrogen fuel cells operate optimally at a steady power output.
HFCVs are also much rarer than electric vehicles. In the U.S., there are only about 17,000 hydrogen-powered vehicles on the roads as of 2022, and they are exclusively found in California due to the state's hydrogen fuelling infrastructure. By contrast, millions of electric vehicles have been sold in the country.
Despite their rarity, HFCVs offer certain advantages. They are considered safe, with high-pressure tanks designed to withstand high-speed crashes without leaking. Additionally, they produce zero tailpipe emissions, making them a zero-emission vehicle option alongside electric vehicles.
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Hydrogen is produced through various methods
Electrolysis involves splitting water molecules (H2O) into hydrogen and oxygen using electricity. This can be done through high-pressure or low-pressure electrolysis, with the former being more cost-effective in many regions. Other electrochemical processes include high-temperature electrolysis and carbon-assisted electrolysis. Electrolysis is advantageous because it can be performed on-site, avoiding the costly delivery process.
Other methods of hydrogen production include solar-driven processes such as photobiological, photoelectrochemical, and solar thermochemical. Photobiological processes use the natural photosynthetic activity of bacteria and green algae, along with sunlight, to produce hydrogen. Photoelectrochemical processes, on the other hand, use specialized semiconductors to separate water into hydrogen and oxygen. Solar thermochemical hydrogen production employs concentrated solar power to drive water-splitting reactions, often in conjunction with other species like metal oxides.
Biological processes that use microbes such as bacteria and microalgae can also produce hydrogen through microbial biomass conversion. In this process, microbes break down organic matter like biomass or wastewater to generate hydrogen.
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Hydrogen refuelling stations are expanding worldwide
Hydrogen is a clean fuel that, when consumed in a fuel cell, produces only water. It can be produced from a variety of domestic resources, such as natural gas, nuclear power, biomass, and renewable power like solar and wind. These qualities make it an attractive fuel option for transportation applications. Hydrogen fuel cell vehicles (HFCVs) use the same kind of electric motor to turn the wheels as battery-electric cars. However, they are powered by a fuel cell stack in which pure hydrogen passes through a membrane to combine with oxygen from the air, producing the electricity that turns the wheels and water vapour as a byproduct.
As of the end of 2023, a total of 1,068 hydrogen refuelling stations (HRS) were in operation in 35 countries worldwide, with 80% of these located in just five countries. This number is expected to increase six-fold by 2030, with 6,080 stations predicted to be in operation by then. China is at the forefront of accelerating HRS construction and is expected to have 2,879 stations in operation by 2030. The growth of hydrogen-powered vehicles and favourable policies towards the market are driving the expansion of HRS. For example, nearly three-quarters of all stations currently in operation have a refuelling capacity of no more than 500 kg per day, with China and the US leading in the construction of large-scale HRS with a daily capacity of over 1,000 kg.
However, it is important to note that there are also challenges to the expansion of HRS. Construction requires large capital investments and high operational costs, and stations can take up to 2-3 years to become operational. Operators must also comply with strict safety regulations and contend with significant costs due to elevated hydrogen prices and equipment maintenance.
Despite these challenges, the increasing demand for hydrogen-powered vehicles is expected to drive the continued expansion of HRS worldwide.
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Frequently asked questions
Hydrogen is a clean fuel that produces only water vapour as waste, making it a zero-emission vehicle. Hydrogen fuel can be produced from a variety of domestic resources, such as natural gas, nuclear power, biomass, and renewable power like solar and wind. Hydrogen cars are powered by an electric motor and are therefore classified as e-cars.
Hydrogen fuel cell cars combine hydrogen and oxygen to produce electricity, which runs a motor. Hydrogen cars have their own power plant on board, which converts the hydrogen in the fuel tank into electricity. The electricity generated in the fuel cell flows to the electric motor and directly drives the vehicle, and/or it charges a battery that acts as temporary storage until the energy is needed for the drive.
Hydrogen is a difficult gas to handle because it has a low volumetric energy density and has to be highly compressed at high pressures to be packed into a tank in sufficient quantities to power a car. The infrastructure for hydrogen refueling stations is also still being developed. Hydrogen production can also lead to pollution, including greenhouse gas emissions, depending on the energy source used.
As of mid-2022, there were 17,000 or fewer hydrogen-powered vehicles on the roads in the US, all of them in California. The Honda Clarity Fuel Cell, the Hyundai Nexo SUV, and the Toyota Mirai have been offered for sale, but Honda has ended production of the Clarity, and Hyundai has sold only about 1600 Nexo SUVs in six years. In 2024, Honda released the CR-V e:FCEV, an adaptation of the popular compact crossover with a hydrogen fuel cell and a larger battery that can be plugged in.
