Left unchecked, corrosion can rust out vehicles and pipes, take down buildings and bridges, and eat away at our monuments.
Corrosion can even injury gadgets that might be key to a clear vitality future. And now, Duke College researchers have captured excessive close-ups of that course of in motion.
“By learning how and why renewable vitality gadgets break down over time, we’d be capable to prolong their lifetime,” mentioned chemistry professor and senior creator Ivan Moreno-Hernandez.
In his lab at Duke sits a miniature model of 1 such machine. Known as an electrolyzer, it separates hydrogen out of water, utilizing electrical energy to energy the response.
When the electrical energy to energy electrolysis comes from renewable sources corresponding to wind or photo voltaic, the hydrogen fuel it churns out is taken into account a promising supply of fresh gas, as a result of it takes no fossil fuels to provide and it burns with out creating any planet-warming carbon dioxide.
A lot of nations have plans to scale up their manufacturing of so-called “inexperienced hydrogen” to assist curb their dependence on fossil fuels, significantly in industries like steel- and cement-making.
However earlier than hydrogen can go mainstream, some massive obstacles should be overcome.
A part of the difficulty is electrolyzers require uncommon steel catalysts to operate, and these are susceptible to corrosion. They are not the identical after a yr of operation than they had been to start with.
In a examine printed April 10 within the Journal of the American Chemical Society, Moreno-Hernandez and his Ph.D. pupil Avery Vigil used a method referred to as liquid part transmission electron microscopy to check the advanced chemical reactions that go on between these catalysts and their atmosphere that trigger them to decay.
You would possibly keep in mind from highschool that to make hydrogen fuel, an electrolyzer splits water into its constituent hydrogen and oxygen molecules. For the present examine, the group centered on a catalyst referred to as ruthenium dioxide that hurries up the oxygen half of the response, since that is the bottleneck within the course of.
“We primarily put these supplies via a stress check,” Vigil mentioned.
They zapped nanocrystals of ruthenium dioxide with high-energy radiation, after which watched the adjustments wrought by the acidic atmosphere contained in the cell.
To take photos of such tiny objects, they used a transmission electron microscope, which shoots a beam of electrons via nanocrystals suspended inside a super-thin pocket of liquid to create time-lapse photos of the chemistry going down at 10 frames per second.
The consequence: desktop-worthy close-ups of virus-sized crystals, greater than a thousand occasions finer than a human hair, as they get oxidized and dissolve into the acidic liquid round them.
“We’re really capable of see the method of this catalyst breaking down with nanoscale decision,” Moreno-Hernandez mentioned.
Over the course of 5 minutes, the crystals broke down quick sufficient to “render an actual machine ineffective in a matter of hours,” Vigil mentioned.
Zooming in a whole bunch of hundreds of occasions, the movies reveal delicate defects within the crystals’ 3D shapes that create areas of pressure, inflicting some to interrupt down quicker than others.
By minimizing such imperfections, the researchers say it may someday be attainable to design renewable vitality gadgets that final two to 3 occasions longer than they presently do.
“So as a substitute of being steady for, say, two years, an electrolyzer may final six years. That might have an enormous impression on renewable applied sciences,” Moreno-Hernandez mentioned.
This analysis was supported by grants from the Nationwide Science Basis (DGE-2139754, ECCS-2025064, ECCS-2025064).