Atomic thickness mica is expected to be an excellent fuel cell proton conductive membrane

Researchers at the University of Manchester have discovered that the atomic thickness of mica is an excellent proton conductor. Mica is the name of a common mineral in the soil. This amazing result is very important for the application of 2D materials in fuel cells and other hydrogen-related technologies.

Previously, researchers at the University of Manchester, led by Professor Andre Geim and Dr. Marcelo lozada-hidalgo, found that materials with a single atom thickness such as graphene have Hydrogen nuclei are highly permeable. However, they also found that other two-dimensional materials, such as molybdenum sulfide (MoS2), are only three atoms thick and are completely impermeable to protons. These results indicate that only single-atom-thick crystals can penetrate protons.

The research team wrote in the journal Nature-Nanotechnology that although the mica layer is 10 times thicker than graphene, protons can easily pass through several mica layers. Mica, like graphite, is composed of stacked crystal layers that can be cut. The research team separated one of the layers and found that it was 100 times more permeable to protons than graphene.

At first glance, this result seems impossible because mica is too thick for protons to penetrate-they are much thicker than a single layer of silica that is completely impermeable to protons. However, mica can be considered as a crystal plate penetrated by a tubular channel. These channels are not empty, but filled with hydroxyl groups, like a one-dimensional conductive chain of protons in water. Protons jump along these chains, turning this material into an excellent proton conductor.

Lucas Mogg, PhD student and first author of the paper, said: "We found that the proton conductivity of atomic thickness mica is 10 to 100 times higher than that of graphene. Graphene has been considered to be a promising proton conductive material. Our results show that mica may be more promising, especially because they are rich and cheap. "Professor Andre Heim said:" This result also This means that many other two-dimensional materials can also be converted into proton conductors. Our strategy is not limited to protons or mica. More two-dimensional crystals with atomic-scale channels can be used for research, promising in the field of protons and ion conductors. Bring unexpected discoveries and new applications. "

The researchers also found that mica has extremely high electrical conductivity in a temperature range that is not known by related technologies.

Dr Marcelo Lozada-Hidalgo said: "Currently there is a lack of proton conductive materials that can work reliably between 100 and 500 degrees Celsius. However, this is the optimal temperature range for fuel cells and other hydrogen technologies to operate. Atomic thickness Of mica work quite well in this temperature range-from this point of view, they deserve attention. "

In addition, the researchers said that they are currently developing a prototype mica film that is large enough to be tested under industrial conditions. They are also optimistic about the possibility that this research opens up in basic research. The research results show that the two-dimensional ion conductor has broad application prospects, because the two-dimensional ion conductor contains a large number of crystals that can be converted into ion conductors and proton conductors.

(Originally from: The Comprehensive New Energy Network of the University of Manchester)

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