Ameer Randolph
Hydrogen fuel cell vehicles (HFCVs) are powered by hydrogen, the most abundant element in the universe. Hydrogen fuel cell vehicles are similar to electric cars, but differ in the way they store energy. Hydrogen fuel cell vehicles are equipped with regenerative braking systems that capture the energy lost during braking and store it in a battery. Hydrogen fuel cell vehicles emit water vapour, and if the hydrogen used is produced with renewable energy, they can be completely carbon-free. Hydrogen fuel cell vehicles are available for sale or lease from major automakers, including Toyota and BMW, and can be refuelled at dedicated hydrogen refuelling stations.
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What You'll Learn
Hydrogen fuel-cell vehicles (HFCV) are similar to electric cars
Another similarity between HFCVs and electric cars is the refueling process. HFCV drivers refill their vehicles' carbon-fiber high-pressure tanks at "hydrogen fueling stations", which are conceptually similar to traditional gas stations, with a similar five-minute refueling time. This is in contrast to the longer charging times often associated with electric vehicles.
In terms of performance, the driving experience of an HFCV is almost identical to that of a battery-electric vehicle, although HFCVs may not be as fast. HFCVs have no transmission and utilize regenerative braking to recapture wasted energy during deceleration, similar to some electric vehicles.
Additionally, both HFCVs and electric cars are considered more environmentally friendly than conventional internal combustion engine vehicles. HFCVs produce no harmful tailpipe emissions, only emitting water vapour and warm air, which helps to reduce air pollution in cities. However, it is important to note that the environmental impact of HFCVs depends on how the hydrogen is produced. If hydrogen production uses renewable energy sources, it can have a neutral carbon footprint.
While there are similarities between HFCVs and electric cars, there are also some notable differences. HFCVs have their own set of advantages and disadvantages that set them apart from typical battery-powered electric vehicles (EVs). The distinct characteristics of HFCVs present unique challenges and opportunities in the automotive industry.
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Hydrogen is the most common element in the universe
Hydrogen fuel-cell vehicles (HFCVs) are powered by a fuel-cell stack, where pure hydrogen combines with oxygen from the air to produce electricity, turning the wheels and producing water vapour. Hydrogen is also used in rocket fuel. HFCVs are technically a series hybrid, and are sometimes classified as fuel-cell hybrid electric vehicles (FCHEVs). Hydrogen cars are currently more expensive than other vehicles, but if hydrogen production increases worldwide, the price per kilogram in Germany, for example, could fall to €4-6 by 2030.
The abundance of chemical elements in the universe is dominated by the large amounts of hydrogen and helium produced during the Big Bang. Hydrogen is especially important because it plays a vital role in fusion reactions that power stars like our sun. These reactions produce heavier elements and release very large amounts of energy. Hydrogen atoms fuse to form helium atoms, a process that releases enough energy to supply over 2.5 million New Zealand homes with their annual energy needs.
Hydrogen is also the third most abundant element on Earth's surface, after oxygen and silicon. Most of the Earth's hydrogen is in the form of chemical compounds such as water and hydrocarbons. At high temperatures and pressures, hydrogen can combine with nitrogen to form ammonia, which is used in fertilisers and nitric acid. Hydrogen has a number of key roles in the human body, including helping to give DNA its signature twist and maintaining the correct pH in the stomach and other organs.
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Hydrogen cars are currently more expensive to produce
Hydrogen fuel-cell vehicles (HFCVs) are powered by a fuel-cell stack, where pure hydrogen combines with oxygen from the air to produce electricity. While HFCVs offer certain advantages over traditional electric cars, such as shorter refuelling times, they are currently more expensive to produce.
One of the primary reasons for the higher production cost of hydrogen cars is the immature industrialization of the manufacturing process. The demand for platinum, a precious metal used as a catalyst in electricity generation, also contributes to the expense. Although the quantity of platinum required for automotive fuel cells has decreased, it remains a significant factor in the overall cost.
Low production volumes of hydrogen cars also play a role in their higher price tag. Increased production volumes would lead to economies of scale, reducing the cost per unit. However, the current low demand and production numbers create a cycle that hinders the widespread adoption of hydrogen cars.
The process of hydrogen production itself is energy-intensive and costly. Hydrogen can be produced through steam methane reformation, using natural gas, or through electrolysis, which can be done with renewable resources. However, both methods require significant energy input, and the liquid hydrogen that results must be carefully stored and transported, adding to the overall expense.
Additionally, the infrastructure for supplying hydrogen to retail outlets and fuelling stations is still developing. The specialized infrastructure required for hydrogen fuelling adds to the overall cost of adopting hydrogen cars. In contrast, electric cars can rely on a more established and widely available network of charging stations.
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Hydrogen cars are locally emission-free
Hydrogen fuel-cell vehicles (HFCVs) are powered by electricity generated by combining hydrogen and oxygen in a fuel-cell stack. This process produces only electrical energy, heat, and water vapour, with no emissions at all. Thus, hydrogen cars are considered locally emission-free, keeping the air in cities clean.
The electricity generated in the fuel cell can either flow directly to the electric motor to drive the vehicle or charge a battery for temporary storage. This battery is significantly smaller and lighter than that of a battery-electric vehicle (BEV) and is constantly recharged by the fuel cell. Hydrogen cars can also recover braking energy, converting the car's kinetic energy back into electrical energy and feeding it into the battery.
While hydrogen cars are locally emission-free, the production of hydrogen fuel can have an adverse impact on the climate. Hydrogen production requires electrical energy, and the process of electrolysis breaks down water into its separate hydrogen and oxygen components. If renewable energy sources, such as solar photovoltaic, wind turbines, or hydropower, are used for electrolysis, hydrogen production can have a neutral carbon footprint. However, if fossil fuels are used, it can negatively affect the climate footprint of a hydrogen car.
The use of hydrogen as a fuel for vehicles offers several advantages. Hydrogen is abundant in the universe and can be produced from various domestic resources. It has a high energy content by weight and is extremely light, making it an excellent energy carrier. Hydrogen cars have a similar refuelling time to traditional gas stations, and the infrastructure for hydrogen fuelling stations is constantly being expanded worldwide.
However, there are also challenges with hydrogen fuel. The industrialization of hydrogen car production is not yet fully developed, and the demand for platinum, a costly precious metal used as a catalyst in electricity generation, plays a role in the overall expense. Additionally, hydrogen needs to be compressed or liquified, making it challenging and expensive to transport, store, and use. Nevertheless, as hydrogen usage scales up, costs are expected to decrease, and hydrogen has the potential to become a widely adopted low- and zero-carbon fuel option.
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Hydrogen cars are refuelled in a similar way to conventional cars
Hydrogen fuel cell vehicles (HFCVs) are powered by an electric motor, which is similar to battery-electric cars. However, instead of being powered by a large, heavy battery, they are powered by a fuel cell stack that combines hydrogen and oxygen to produce electricity. This process also emits water vapour and warm air, but no harmful tailpipe emissions.
HFCV drivers refill their vehicles at "hydrogen fuelling stations", which are very similar to traditional gas stations. Hydrogen is refuelled through special pumps, and the infrastructure for these pumps is constantly being expanded worldwide. The main difference between hydrogen and electric cars is that hydrogen vehicles cannot be refuelled at home overnight, and drivers are dependent on a reliable supply of hydrogen at a properly operating high-pressure fuelling station.
The process of refuelling a hydrogen car is similar to that of a conventional car. It takes around three to five minutes to refuel a hydrogen car, which is comparable to the time it takes to refuel a conventional car. The cost of refuelling a hydrogen car is also similar to that of a conventional car. In California in late 2022, the cost of hydrogen was between $10 and $17 per kilogram, which is equivalent to $5 to $8.50 per gallon of gasoline.
In addition to the short refuelling time, hydrogen cars have other advantages over electric cars. They do not suffer from long charging times, and they have a similar range to electric cars with large battery storage. Hydrogen cars are also considered to be safe, with high-pressure tanks designed to withstand high-speed crashes without leaking or breaching.
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Frequently asked questions
Hydrogen fuel cars, or hydrogen fuel-cell vehicles (HFCV), are powered by hydrogen fuel and use electric motors to turn the wheels. They are similar to electric cars but differ in the way they store energy.
Hydrogen fuel cars use hydrogen fuel cell stacks to power the vehicle. Hydrogen passes through a membrane to combine with oxygen from the air, producing electricity to turn the wheels and water vapour as a byproduct.
Hydrogen fuel cars are clean, safe, and produce little to no emissions. They are also quieter than traditional cars and have a similar range and performance to gasoline cars.
Hydrogen fuel cell electric vehicles include the Toyota Mirai, which is the best-selling hydrogen car in the U.S., and models from major automakers like BMW and Toyota.
Hydrogen fuel cars can be refuelled at dedicated hydrogen refuelling stations. The process is similar to refuelling a conventional petrol or diesel car, and it takes around five minutes to refuel.
