Katerina Swanson
Hydrogen fuel cells have been around since the 1960s, but they have recently gained traction as a potential solution for decarbonizing heavy transport. With diesel prices on the rise and concerns about Saudi Arabian oil production, hydrogen fuel cells offer a promising alternative. The focus on localized hydrogen production and the utilization of renewable energy sources have made hydrogen fuel cells an attractive option. While the range of fuel cell trucks is currently lower than that of diesel trucks, advancements in technology and cost reduction through increased adoption could make hydrogen fuel cells a viable solution. In this context, understanding the electrical output of 1 kg of hydrogen is crucial for evaluating the potential of hydrogen fuel cells as a large-scale energy source.
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What You'll Learn
Hydrogen fuel cells are an alternative to diesel
Hydrogen is a zero-emission fuel with water being its only byproduct, in contrast to the harmful emissions produced by diesel and gasoline. Hydrogen fuel cells can be particularly suitable for larger vehicles, where battery weight could be an issue, and they offer a similar range and refueling time to diesel trucks. This balance of range and weight is crucial for the economics of freight transportation, allowing trucks to spend more time on the road.
The interest in hydrogen as an alternative to diesel stems from its potential to power zero-emission vehicles and its suitability for use in fuel cells. Hydrogen fuel cells have been available since the 1960s but have recently gained traction as a potential solution for decarbonizing heavy transport. The production of hydrogen-fueled vehicles is currently limited by the availability of hydrogen refueling infrastructure, but this is expected to improve as the use of hydrogen in transportation increases.
The cost of hydrogen production is also a factor, with predictions that green hydrogen will become fully cost-competitive with fossil hydrogen when it costs less than $1.50 per kilogram. Hydrogen can be produced from various domestic resources, reducing dependence on imported oil, and it can be made from water, making it an almost inexhaustible resource. Hydrogen fuel cells are gaining support from major companies and significant investments, indicating a promising future for this low-carbon alternative to diesel.
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Hydrogen has been used for fuel since the 1960s
Hydrogen has been used as a fuel since the 1960s, particularly in the aerospace industry. Hydrogen fuel cells were used to power the Apollo and Space Shuttle missions. Hydrogen fuel cell vehicles (FCEVs) have been around since the 1960s, but they are now emerging as a potential solution for decarbonising heavy transport. Hydrogen is a clean fuel that, when consumed in a fuel cell, produces only water and a small amount of heat. It is a highly efficient energy source, with a kilogram of hydrogen containing about 33.3 kWh of energy.
Hydrogen fuel cells are also used for electricity generation and powering vehicles. They are particularly attractive for transportation applications because they are lightweight and have a higher torque compared to battery-electric vehicles. Hydrogen can be produced from a variety of sources, including natural gas, nuclear power, biomass, and renewable power like solar and wind. It is also a by-product of several industrial processes, such as treating metals, producing fertiliser, and processing foods.
Despite the advantages of hydrogen fuel cells, there are some challenges to their widespread adoption. One issue is the limited infrastructure for hydrogen fuelling stations, which makes it difficult for consumers to adopt hydrogen-fuelled vehicles. Additionally, hydrogen fuel cells currently have a high cost, and the production of hydrogen-fuelled vehicles is limited. However, companies like Nikola Motors are working to address these challenges by raising funds for hydrogen vehicle technology and partnering with other companies to develop a network of local hydrogen production stations.
Governments and organisations are also implementing policies and providing funding to support the development and adoption of hydrogen fuel. For example, the State of California's Advanced Clean Cars Program promotes a consumer market for zero-emission fuel cell vehicles, and the European Union has approved funding for hydrogen-related projects. China has also committed to getting 1 million fuel cell vehicles on the road by 2030, with significant investment in heavy-duty trucking. These efforts are driving advancements in the efficiency and cost-effectiveness of fuel cell vehicles.
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Hydrogen costs more to produce than diesel
Hydrogen fuel cells have been around since the 1960s, but they have recently gained traction as a potential solution for decarbonizing heavy transport. Hydrogen has a higher energy value per kilogram than diesel, with 1 kg of hydrogen containing about 33.3 kWh of energy. In contrast, diesel prices are currently close to $3.00 per gallon, and a kilogram of hydrogen is estimated to cost around $1.40 to produce. However, hydrogen currently retails at a much higher price, ranging from $8.50 to $16.50 per kilogram, making it two to three times more expensive than gasoline or diesel.
The higher retail cost of hydrogen is primarily due to compression and delivery expenses, which make up over 80% of the total retail cost. Despite this, experts predict that hydrogen prices will decrease significantly in the coming years as production scales up. For instance, the California Air Resources Board (CARB) and Washington state's Department of Ecology (DoE) anticipate lower hydrogen fuel retail prices in the future. Additionally, the U.S. Department of Energy's Earthshots program aims to reduce the costs of hydrogen fuel cell buses, making them more affordable than battery-powered and ICE buses.
The cost of producing hydrogen is expected to drop below $1.50 per kilogram, making it competitive with fossil hydrogen. This price reduction depends on low electricity prices and decreasing electrolyser costs. Hydrogen production also requires massive investments in renewable energy infrastructure, which could accelerate the transition to hydrogen as a fuel source.
While hydrogen fuel cell vehicles (FCEVs) have advantages such as lower weight and high torque, they face challenges in terms of range. For example, a fuel cell truck may have a range of 500-750 miles, while a diesel truck can typically travel well over 1,000 miles without refueling. This range disparity poses a significant disadvantage for hydrogen-powered vehicles.
In conclusion, while hydrogen currently costs more to produce than diesel, the gap in retail prices is even wider. However, hydrogen is expected to become more affordable in the future due to anticipated cost reductions and increasing governmental support. As production scales up and investments in renewable energy infrastructure grow, hydrogen may become a more viable alternative to diesel and other fossil fuels.
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Hydrogen production requires lots of electricity
Hydrogen fuel cells are an alternative to diesel for heavy transport, offering high torque at a lower weight. Hydrogen is also used for electricity generation and powering vehicles. Hydrogen fuel can be produced through several methods, including natural gas reforming, electrolysis, solar-driven processes, and biological processes.
Natural gas is currently the primary source of hydrogen production, accounting for around three-quarters of annual global dedicated hydrogen production. However, hydrogen production from natural gas and other fossil fuels is responsible for a significant amount of annual CO2 emissions. To reduce the environmental impact of hydrogen production, there is a growing interest in electrolytic hydrogen, which uses dedicated electricity generation from renewables or nuclear power. Electrolytic hydrogen will become more cost-competitive as electricity and electrolyser prices decrease.
The production of electrolytic hydrogen requires a significant amount of electricity. For example, producing today's dedicated hydrogen output from electricity would result in an electricity demand of 3,600 TWh, more than the total annual electricity generation of the European Union. To meet the future demand for hydrogen, which is estimated at 500 million tonnes, the world will need to produce 22,000 TWh of green electricity annually. This will require a sharp acceleration in renewable installations to several terawatts per year.
While hydrogen production requires a lot of electricity, it also has the potential to facilitate decarbonization by storing energy produced with renewable energy for days or even weeks. Hydrogen can be produced with renewable resources when renewable energy production is high and stored for electricity generation when renewable resources are limited and demand is high. This makes hydrogen an attractive option for storing and generating electricity, especially as fuel cell efficiency continues to improve.
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Hydrogen fuel cells are less efficient over time
Hydrogen fuel cells are an alternative energy source that can be used in a variety of applications, from electric vehicles to backup power for buildings. Hydrogen fuel cells are generally between 40% to 60% energy efficient, according to sources. However, some have questioned the efficiency of hydrogen fuel cells, particularly in vehicles, where they are less efficient than the best diesel engines.
The efficiency of hydrogen fuel cells depends on a variety of factors, including the type of fuel cell and the conditions under which it operates. For example, at the start of the 21st century, the efficiency of a hydrogen fuel cell running on atmospheric air varied from about 45% at maximum load to about 65% when operating at low power output. Fuel cell stack efficiencies are typically 50% to 60% at design power, but they can experience losses due to electrical losses in cells and energy expended to overcome resistance at the electrodes.
The efficiency of hydrogen fuel cells also depends on how the hydrogen is produced. If electrical power is used to make the hydrogen, and the efficiency of electricity production varies from 30% to 55%overall fuel cell efficiency is 13.5% to 36%. On the other hand, if the hydrogen is produced by converting gasoline, the overall efficiency is 31.5% to 52%. Additionally, the efficiency of hydrogen fuel cells can be impacted by the temperature at which they operate, with low-temperature fuel cells requiring a different calculation for efficiency than high-temperature fuel cells.
Over time, hydrogen fuel cells may become less efficient due to several factors. Firstly, fuel cells experience energy losses during hydrogen production, which can impact their overall efficiency. Secondly, fuel cells require a continuous source of fuel and oxygen to sustain the chemical reaction and produce electricity. If there are interruptions in the supply of fuel or oxygen, the fuel cell may not operate at maximum efficiency. Additionally, fuel cells may experience performance degradation over time due to factors such as carbon build-up on the anode, which slows down the internal fuel reforming process.
While hydrogen fuel cells may be less efficient over time, there are ways to mitigate these losses. For example, using a battery pack in conjunction with a fuel cell can provide surge power and improve the overall efficiency of the system. Additionally, advancements in technology and increased investment in research and development can lead to improvements in fuel cell efficiency. For instance, China's commitment to getting 1 million fuel cell vehicles on the road by 2030 is expected to result in significant advancements in efficiency and cost reduction for fuel cell vehicles.
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Frequently asked questions
1kg of hydrogen has an energy value of about 33.3 kWh, which can be used to produce around 18.4 kWh of usable electricity after running it through a fuel cell.
The cost of producing 1kg of hydrogen depends on electricity prices and the efficiency of the production process. Currently, the cost is estimated to be around $1.40 per kg, and observers say green hydrogen will be fully cost-competitive with fossil hydrogen when it costs less than $1.50 per kg.
MRE electrolyzers require 48 kilowatt hours (kWh) of electricity to produce 1kg of hydrogen. However, more energy is needed to compress and purify the hydrogen, ranging from 5 to 15 kWh per kg depending on the system.
The amount of hydrogen required depends on the efficiency of the fuel cell, which is typically higher when the fuel cell is new. To run a 200 kW fuel cell for 8 hours, approximately 94 kg of hydrogen is required.
