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Trace amounts of uranium exist in seawater, but efforts to extract that critical ingredient for nuclear power have produced insufficient quantities to make it a viable source for those countries that lack uranium mines.

A practical method for extracting that uranium, which produces higher quantities in less time, could help make nuclear power a viable part of the quest for a carbon-free energy future.

“Concentrations are tiny, on the order of a single grain of salt dissolved in a liter of water,” said Yi Cui, a materials scientist and co-author of a paper in Nature Energy. “But the oceans are so vast that if we can extract these trace amounts cost effectively, the supply would be endless.”

Alternative forms of energy like wind or solar are critical for reducing the world’s carbon emissions. While wind and solar costs are plunging, some experts argue that nuclear power remains important because it can be turned on and off to match peaks and valleys in demand without carbon emissions.

“We need nuclear power as a bridge toward a post-fossil-fuel future,” said Professor Steven Chu, a Nobel Prize-winning physicist and co-author of the Nature Energy article. “Seawater extraction gives countries that don’t have land-based uranium the security that comes from knowing they’ll have the raw material to meet their energy needs.”

Chu, a former U.S. secretary of energy who encouraged seawater extraction research before he left the Department of Energy (DOE) to return to Stanford, observed that nuclear power currently generates 20 percent of U.S. electricity and 13 percent worldwide. Even as researchers work to improve reactor safety and solve the waste disposal issues, he believes that a practical way to extract uranium from seawater is needed to reduce the energy insecurity of nations that depend on nuclear power but lack uranium within their own borders.

The Stanford findings build on years of research in Japan and China, as well as by DOE scientists at Oak Ridge National Laboratory and the Pacific Northwest National Laboratory.

Scientists have long known that uranium dissolved in seawater combines chemically with oxygen to form uranyl ions with a positive charge. Extracting these uranyl ions involves dipping plastic fibers containing a compound called amidoxime into seawater. The uranyl ions essentially stick to the amidoxime. When the strands become saturated, the plastic is chemically treated to free the uranyl, which then has to be refined for use in reactors just like ore from a mine.

Postdoctoral scholar Chong Liu examines a carbon-amidoxime electrode. | Image credit: L.A. Cicero

How practical this approach is depends on three main variables: how much uranyl sticks to the fibers; how quickly ions can be captured; and how many times the fibers can be reused.

In the recent work, the Stanford researchers improved on all three variables: capacity, rate and reuse. Their key advance was to create a conductive hybrid fiber incorporating carbon and amidoxime. By sending pulses of electricity down the fiber, they altered the properties of the hybrid fiber so that more uranyl ions could be collected.

Postdoctoral scholar Chong Liu oversaw the lab tests that compared Stanford’s amidoxime-carbon hybrid fibers with today’s amidoxime fibers. First she tested how much uranyl each type of fiber could hold before reaching saturation. In these tests she found that by the time the standard amidoxime fiber had become saturated, Stanford’s amidoxime-carbon hybrid fibers had already adsorbed 9 times as much uranyl and were still not saturated. What’s more, the electrified fiber captured three times as much uranyl during an 11-hour test using seawater from Half Moon Bay, about an hour from Stanford, and had three times the useful lifespan of the standard amidoxime.

“We have a lot of work to do still but these are big steps toward practicality,” Cui said.