Researchers from The University of Warwick and the University of Manchester have finally solved the long-standing puzzle of why graphene is so much more permeable to protons than expected by theory. A decade ago, scientists at The University of Manchester demonstrated that graphene is permeable to protons, nuclei of hydrogen atoms.
The unexpected result started a debate in the community because theory predicted that it would take billions of years for a proton to permeate through graphene's dense crystalline structure. This had led to suggestions that protons permeate not through the crystal lattice itself, but through the pinholes in its structure.
Now, writing in Nature, a collaboration between the University of Warwick, led by Prof. Patrick Unwin, and The University of Manchester, led by Dr. Marcelo Lozada-Hidalgo and Prof. Andre Geim, report ultra-high spatial resolution measurements of proton transport through graphene and prove that perfect graphene crystals are permeable to protons. Unexpectedly, protons are strongly accelerated around nanoscale wrinkles and ripples in the crystal.
The discovery has the potential to accelerate the hydrogen economy. Expensive catalysts and membranes, sometimes with significant environmental footprint, currently used to generate and utilise hydrogen could be replaced with more sustainable 2D crystals, reducing carbon emissions, and contributing to Net Zero through the generation of green hydrogen.
The team used a technique known as scanning electrochemical cell microscopy (SECCM) to measure minute proton currents collected from nanometre-sized areas. This allowed the researchers to visualise the spatial distribution of proton currents through graphene membranes.
If proton transport took place through holes as some scientists speculated, the currents would be concentrated in a few isolated spots. No such isolated spots were found, which ruled out the presence of holes in the graphene membranes.
Drs. Segun Wahab and Enrico Daviddi, leading authors of the paper, commented: "We were surprised to see absolutely no defects in the graphene crystals. Our results provide microscopic proof that graphene is intrinsically permeable to protons."
Unexpectedly, the proton currents were found to be accelerated around nanometre-sized wrinkles in the crystals. The scientists found that this arises because the wrinkles effectively 'stretch' the graphene lattice, thus providing a larger space for protons to permeate through the pristine crystal lattice. This observation now reconciles the experiment and theory.
Dr. Lozada-Hidalgo said: "We are effectively stretching an atomic scale mesh and observing a higher current through the stretched interatomic spaces in this mesh - this is truly mind-boggling."
Prof. Unwin commented: "These results showcase SECCM, developed in our lab, as a powerful technique to obtain microscopic insights into electrochemical interfaces, which opens up exciting possibilities for the design of next-generation membranes and separators involving protons."
The authors are excited about the potential of this discovery to enable new hydrogen-based technologies. Dr. Lozada-Hidalgo said, "Exploiting the catalytic activity of ripples and wrinkles in 2D crystals is a fundamentally new way to accelerate ion transport and chemical reactions. This could lead to the development of low-cost catalysts for hydrogen-related technologies."
Research Report:Proton transport through nan
oscale corrugations in two-dimensional crystals
Artificial Intelligence Analysis
Defense Industry Analyst:
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6/10
General Industry Analyst:
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Analyst Summary
: Researchers from The University of Warwick and the University of Manchester have discovered the mechanism by which graphene is so much more permeable to protons than theory predicted. Using scanning electrochemical cell microscopy (SECCM) to measure proton currents, the team found that protons are strongly accelerated around nanoscale wrinkles and ripples in the crystal, which explains its permeability. This discovery has the potential to accelerate the hydrogen economy by reducing the need for expensive catalysts and membranes to generate and utilize hydrogen, and it could help to contribute to Net Zero through the generation of green hydrogen. This is highly significant when compared to the development of the space and defense industry over the past 25 years, as it could revolutionize the way energy is produced and utilized, particularly in the aerospace sector.Investigative
Question:
- 1. How could this discovery be used to reduce the cost of generating and utilizing hydrogen in the aerospace industry?
- 2. What are the potential environmental impacts of introducing graphene crystals for hydrogen production?
- 3.
What other applications could be developed from this research?4. How could this technology be scaled up to enable wider adoption?
5. What are the potential limitations of proton transport through graphene crystals?
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