The most abundant element on earth is water. With the right technology, Hydrogen can be used to create hydrogen fuel that is clean and green. Hydrogen-powered cars are already in use by many countries, but they still only make up less than 1% of all the cars sold worldwide each year. Hydrogen could one day replace fossil fuels as a significant power source for transportation, industry and homes. How can this happen?
Hydrogen is a clean and abundant fuel, that when consumed in a fuel cell, has a by-product of only water. Hydrogen can store, transport and deliver energy produced from other sources such as coal. It is manufactured from various resources, including solar, wind, biomass, natural gas and nuclear power. It is an attractive fuel source as it is utilised in housing, portable energy, vehicles, and transportation.
The most common methods today of production include:
Thermal processes use energy from coal, natural gas and biomass to release Hydrogen from their molecular structures. In combination with heat, some thermochemical methods use closed chemical cycles to extract Hydrogen. Some of these processes include:
Using the process of electrolysis, electrolyses use electricity to split water into Hydrogen and oxygen. This method to extract Hydrogen is efficient and popular.
Also produced through photolytic processes, sometimes referred to as direct water splitting, which uses light energy to split Hydrogen and oxygen. The potential of this process is a low environmental impact. Still, these processes are in the early stages of research, and their long term potential for sustainable hydrogen production is unknown.
Solar water splitting processes include:
Hydrogen can be extracted from microbes such as bacteria that produce Hydrogen through biological processes. A sustainable, low carbon method of hydrogen production is achieved using sunlight or organic matter. Examples include:
Fuel cells are often classified by the electrolyte that they contain. Classifications determine the cells capabilities and characteristics such as electrochemical reactions that occur in the cell, catalysts required, operating temperatures and fuel required. Fuel cells have advantages and disadvantages which determine their potential applications.
Fuel examples of fuel cells include:
Fuel cells require expensive raw materials such as platinum and complex manufacturing procedures, which result in a high purchase price.
Hydrogen fuel cells are expensive for two significant reasons:
A hydrogen fuel cell electric vehicle (FCEV) is a vehicle powered with electricity generated from chemical reactions of onboard Hydrogen between oxygen, which drive an electric motor. In comparison, a traditional electric vehicle (EV) is powered with electricity stored onboard via a cell, which is generally restored with a plug or regenerative braking.
A hydrogen-on-demand system (HOD) provides Hydrogen for use by an internal combustion engine. HOD systems give the possibility to convert traditional fossil fuel vehicles to run on hydrogen power. These systems often utilise a process called hydrogen injection to create Hydrogen using water and convert it into a gas.
The gas (HHO) is created by running an electrical charge (generated by the vehicle's battery) through water and other chemicals. This is then fed into the engine through the intake manifold, where it mixes with the fuel and is burned in the combustion chamber. Adding HHO gas to the fuel allows it to burn at a lower temperature, increase efficiency, and decrease harmful carbon emissions.
The results also showed a 10% increment in the gasoline engine thermal efficiency, 34% reduction in fuel consumption, 18% reduction in carbon dioxide, 14% reduction in HC and 15% reduction in NOx (EL-Kassaby, Eldrainy, Khidr and Khidr, 2016).
Hydrogen competes with fossil fuels and battery-powered vehicles on driving range exceptionally well, with high efficiency. An entire hydrogen cell will last approximately 480 kilometres. Comparatively, the average petrol or diesel tank will last between 400 and 600km. Battery-powered vehicles are competitive in range, capable of driving long distances, but long charge times of 30 minutes to 12 hours are considered their most significant disadvantage.
Industrial demand for Hydrogen has grown over three times that of 1975. Supply is often derived from fossil fuels, with 6% of global natural gas supply and 2% of coal supply used for hydrogen production.
Global spending on hydrogen energy research has been increasing over the past few years, but it is yet to return to its peak, 2008. Governments primarily look at battery-powered electric vehicles as the solution, and manufacturers have taken a similar stance with only Toyota pushing FCEV's.
In the future, fuel cells could power our cars, with Hydrogen replacing the petroleum fuel used in most vehicles today. However, it is more likely that battery-powered EV's will have the most significant market share. Innovation in cell technology could change this.
International cooperation is pivotal in accelerating the growth and viability of Hydrogen. A coordinated global push at a government level would increase awareness and investment into the technology, bringing costs down and increasing availability as a viable fuel.
In 1970, a nuclear physicist named Lawrence W Jones presented a paper that noted, 'The use of liquid hydrogen must be seriously considered the logical replacement for hydrocarbons in the 21st century.' Since then, scientists have looked to Hydrogen as a possible future solution for the worlds energy crisis.
As oil prices plummeted in the 1980s, Hydrogen's appeal to the energy market vanished, only to come back around the start of the technology and internet bubble in the early 2000s. Low oil prices and bureaucracy have inhibited Hydrogen's traction as a critical player in the energy industry until now.
Researchers from UNSW Sydney have determined that Australia is in an excellent position to take advantage of its environment, with its solar resource to produce green Hydrogen for export. It is not using any energy from the grid - which uses fossil fuels for energy production, using power from solar cells to produce green hydrogen energy. With its spacious and sun abundant outback, Australia could envision itself become a key global player in the production of green Hydrogen.
The pressing need for affordable, green Hydrogen could not come sooner, with California governor Gavin Newsom making a bold attempt of creating California a carbon-neutral state by 2045. The executive order directs state agencies to develop regulations that ensure that all new passenger cars and trucks sold in the state are zero emissions by 2035 and heavy-duty vehicles by 2045. This limits future sales to electric vehicles and Hydrogen-powered vehicles.
Environmental initiatives are sprouting as increasingly more attention is being cast on the ecological practices of states. This is likely to increase the pressure and incentives for Hydrogen's increased and greener production, resulting in competitive pricing to compete with future electric vehicles and traditional fossil fuels.