The study has a pending US patent application and was published in the journal Applied Materials in February.
Aluminum is a great choice for this application because it combines quickly and easily with the oxygen molecules in water to produce hydrogen gas. However, the metal's pure state is so reactive that it cannot react with water, since it rapidly forms an oxide of aluminum when it comes into contact with air.
Gallium is used in this situation. The removal of the aluminum oxide covering that develops on bare metal by gallium, which is liquid at just above room temperature, enables the metal to come into direct touch with the water and interact with it. Although the production of hydrogen gas from the reaction of aluminum and gallium with water is already well-known in science, the new technology has advancements that get it closer to practical applications.
The researchers claim that earlier research of this kind mostly utilized composites rich in aluminum. However, they found that utilizing a mixture rich in gallium resulted in an unforeseen high rate of hydrogen production.
"Without optimization, we were able to recover 95% of the consumed gallium after the process. Only Alumina [Aluminum Oxide], which has numerous other uses, was produced, according to Scott Oliver, the research article's co-corresponding author.
Because gallium is a valuable and scarce material, this is significant. Alumina is used in numerous products, such as cutting tools, abrasion-resistant tiles, and spark plugs.
Gallium was eroding the aluminum oxide layer and dissolving the aluminum into nanoparticles as a result of the composite's altered composition, which sped up the reaction. For the maximum hydrogen generation, the scientists discovered that a 3:1 ratio of gallium and aluminum in the composite was ideal. Additionally, it's quite simple to build the composite. It was made by the researchers manually combining minuscule amounts of gallium and aluminum.
The researchers are enthusiastic, but it is yet unclear whether this method can be scaled up to manufacture hydrogen in large amounts for commercial use. "The technology should be scalable to industrial levels of production. Our ability to measure the hydrogen volume and the campus hydrogen restrictions were our only constraints. The alloy must be mixed under supervision during scaling up, but once water is added, the reaction is spontaneous, Oliver continued.
Battery electric vehicles, which typically employ lithium-ion batteries to store electricity that can be used to propel the vehicle using electric motors, have received the majority of attention in the global push for electric vehicles. Using "hydrogen fuel cells" to produce power from hydrogen and utilize it is an alternative technology.
Compared to hydrogen, fuel cell vehicles have one advantage: they can refuel with hydrogen almost as quickly as a regular vehicle can replenish with fossil fuels. Additionally, they lessen reliance on lithium and cobalt, which are needed to make lithium-ion batteries.
However, using hydrogen has a serious drawback as well. The majority of the hydrogen gas produced worldwide, according to the US Department of Energy, is produced by reforming fossil fuels like natural gas. Additionally, it takes a lot of energy to produce hydrogen utilizing renewable energy. This obstacle to the widespread adoption of hydrogen fuel could be removed by new technologies like the one developed by the UCSC.
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