Mercedes Mullins
Water-fuelled cars have been a topic of interest for many years, with the first alleged demonstration of a water-fuelled car reported in 1935. Since then, there have been numerous claims of cars that can run exclusively on water, often involving electrolysis to separate water into hydrogen and oxygen. However, experts have disputed the feasibility of such systems due to the energy equation and the laws of thermodynamics. While water itself cannot be used as fuel, it is a source of hydrogen, which has shown promise as an alternative fuel for cars. Hydrogen fuel cells, which use hydrogen to generate electricity and power cars, are currently in the prototype stage, while hydrogen-powered buses, trucks, and cars already exist.
Can cars use water for fuel?
| Characteristics | Values |
|---|---|
| Possibility of using water as fuel | Theoretically possible, but practically difficult and inefficient |
| Methods to use water as fuel | Electrolysis to separate water into hydrogen and oxygen, recombining to release energy |
| Energy efficiency | The energy required to separate the elements is equal to the energy released, making it inefficient |
| Environmental impact | Using water as fuel may increase greenhouse gas emissions due to the combustion of gasoline and hydrogen |
| Safety considerations | Hydrogen is highly flammable and explosive, requiring special care |
| Viability | Hydrogen fuel cells are the preferred method to power cars, emitting only water as a byproduct |
| Current applications | Hydrogen is used in commercial transport (buses and trucks) and private cars |
| Alternatives | Electric cars, gasoline/electric hybrid cars |
| Limitations | Water does not possess the energy required for propulsion, and pure water cannot be used as fuel |
| Additives | Some additives, such as sodium, potassium metal, or aluminium, can be used with water to produce hydrogen |
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Hydrogen fuel enhancement
Water-fuelled cars are not a new concept, and many inventors have claimed to have created a functional water-fuelled car. However, these claims are often disputed or proven false, as water itself cannot be used as fuel without an input of energy, violating the laws of thermodynamics.
While hydrogen fuel enhancement has been promoted for use with gasoline-powered and diesel trucks, it is important to note that the installation of such devices may involve illegally tampering with a vehicle's emissions control system, which could result in significant fines. Additionally, many tests by consumer watch groups have shown negative results, with some claiming that the concept violates the laws of thermodynamics.
Despite the disputes and challenges, the idea of hydrogen fuel enhancement holds promise for the future of the automotive industry. Hydrogen-enriched fuel has emerged as an important energy source for internal combustion engines due to its cleanliness and continuous regeneration. Scientists have conducted several studies on creating an effective hydrogen-fuel internal combustion engine, recognizing its potential to replace traditional fossil fuels.
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Electrolysis
However, the laws of thermodynamics dictate that the energy required to separate water's elements will always be equal to or greater than the amount of energy released when they are recombined. This means that the energy output of the system is less than the energy input, making it inefficient.
Despite this, electrolysis could still be a viable method for saving energy if it is powered by a renewable, non-polluting energy source such as solar or wind power. Additionally, hydrogen fuel cell cars, which use hydrogen as a fuel, are gaining traction. Hydrogen is a clean and versatile fuel that can be produced by electrolysis. However, the commercialisation of hydrogen fuel and the development of hydrogen fuel cell infrastructure are still ongoing challenges.
There have been numerous claims and patents for water-fuelled cars that utilise electrolysis. However, these have largely been discredited as pseudoscience or fraud. It is important to view offers of kits that claim to convert cars to run on water with skepticism, as water itself cannot contribute any energy to the system.
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Steam cars
The first steam-powered vehicle was built in 1679 by Ferdinand Verbiest, a Flemish Jesuit in China. It was a toy for the Chinese Emperor, a carriage rather than a car, but it is likely the first-ever engine-powered vehicle. The first working self-propelled, land-based mechanical vehicle was built by French inventor Nicolas-Joseph Cugnot in 1769 and 1771 for use by the French Army. It was a three-wheeled, steam-powered dray capable of carrying five tons at two miles per hour, but it was difficult to steer and its inefficient boiler limited its operating time to about 15 minutes.
Automated quick-firing boilers eventually solved these problems, but by then, more efficient gasoline engines had taken over the market, and steam cars became obsolete. Steam cars also faced competition from electric cars, which were popular to some extent, although they had a short range and could not be charged on the road.
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Water injection
The water/methanol mixture used in water injection is relatively simple to make, with a standard 50/50 blend of methanol fuel and distilled water. This ratio is important as it prevents the mixture from becoming flammable, improving safety. The ideal location for injecting the water/methanol mixture is typically on the intake elbow extending into the intake manifold, although it can also be injected directly into the intake before the valves.
While water injection can provide benefits in terms of power and performance, there are some challenges and potential drawbacks. For example, uncoated areas of the engine may be susceptible to rust due to the water injection, and there is a risk of engine damage if the water runs out and internal components overheat. Additionally, injecting water with petrol or diesel may reduce emissions by limiting combustion peak temperatures, but it may also cause problems in the catalytic converter.
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Hydrogen fuel cells
While water itself cannot be used as fuel for cars, some proposed water-fuelled cars rely on electrolysis to separate water into hydrogen and oxygen, which can then be recombined to release energy. This technology has been adapted to power automobiles, with hydrogen fuel cells being used to power vehicles with an electric motor.
Hydrogen fuel-cell vehicles (HFCVs) use an electric motor to turn the wheels, similar to a battery-electric car. However, instead of being powered by a large, heavy battery, they are powered by a fuel-cell stack where pure hydrogen passes through a membrane to combine with oxygen from the air, producing electricity and water vapour. This makes HFCVs technically a series hybrid, and they are sometimes classified as fuel-cell hybrid electric vehicles (FCHEVs).
The most common type of fuel cell for vehicle applications is the polymer electrolyte membrane (PEM) fuel cell. In a PEM fuel cell, an electrolyte membrane is sandwiched between a positive electrode (cathode) and a negative electrode (anode). Hydrogen is introduced to the anode, and oxygen is introduced to the cathode. The hydrogen molecules break apart into protons and electrons due to an electrochemical reaction aided by a catalyst. The protons travel through the membrane to the cathode, while the electrons are forced to travel through an external circuit to provide power to the electric motor. They then recombine with the protons on the cathode side, where the protons, electrons, and oxygen molecules combine to form water.
The amount of energy stored in an HFCV is determined by the size of the hydrogen fuel tank, and they can typically be fuelled in about 5 minutes and have a driving range of over 300 miles. HFCVs are also equipped with regenerative braking systems that capture the energy lost during braking and store it in a battery. This battery provides extra power during short acceleration events and can be used to idle or turn off the fuel cell when less power is needed.
Examples of HFCVs
Since 2015, a few hydrogen-powered cars have been offered for sale, including the Honda Clarity Fuel Cell, the Hyundai Nexo SUV, and the Toyota Mirai, the best-selling hydrogen car in the US. However, as of mid-2022, fewer than 17,000 hydrogen-powered vehicles are on US roads, and they are all in California, the only state with a network of retail hydrogen fuelling stations.
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Frequently asked questions
Water cannot be used directly as fuel for cars. However, water can be decomposed into hydrogen and oxygen through electrolysis, and the isolated hydrogen can be used to power fuel cells.
Hydrogen fuel cells generate electricity by reacting hydrogen with oxygen from the air to create water. This electricity can then be used to power cars.
Hydrogen fuel cells emit only water vapour and do not produce any greenhouse gases, making them environmentally friendly. They also have the potential to replace internal combustion engines, which can improve fuel efficiency and reduce emissions.
Hydrogen is expensive and challenging to produce, which makes it infeasible for large-scale deployment. Additionally, hydrogen is highly flammable and explosive, requiring special care in installation and use.
