Researchers at the Department of Energy’s SLAC National Accelerator Laboratory and Stanford University have shown for the first time that a low-cost, non-precious metal cobalt phosphide (CoP) catalyst catalyst can split water and generate hydrogen gas for hours on end in the harsh environment of a commercial device.

The electrolyzer technology, which is based on a polymer electrolyte membrane (PEM), has potential for large-scale hydrogen production powered by renewable energy, but it has been held back in part by the high cost of the precious metal catalysts—e.g., platinum and iridium—needed to boost the efficiency of the chemical reactions.

This study points the way toward a cheaper solution, the researchers reported in Nature Nanotechnology.

There’s been extensive work over the years to develop alternatives to precious metal catalysts for PEM systems. Many have been shown to work in a laboratory setting, but Thomas Jaramillo, director of the SUNCAT Center for Interface Science and Catalysis, who led the research team, said that to his knowledge this is the first to demonstrate high performance in a commercial electrolyzer.

The device was manufactured by a PEM electrolysis research site and factory in Connecticut for Nel Hydrogen, the world’s oldest and biggest manufacturer of electrolyzer equipment.

Electrolysis works much like a battery in reverse: Rather than generating electricity, it uses electrical current to split water into hydrogen and oxygen. The reactions that generate hydrogen and oxygen gas take place on different electrodes using different precious metal catalysts. In this case, the Nel Hydrogen team replaced the platinum catalyst on the hydrogen-generating side with a catalyst consisting of cobalt phosphide nanoparticles deposited on carbon to form a fine black powder, which was produced by the researchers at SLAC and Stanford. Like other catalysts, it brings other chemicals together and encourages them to react.

The cobalt phosphide catalyst operated extremely well for the entire duration of the test, more than 1,700 hours—an indication that it may be hardy enough for everyday use in reactions that can take place at elevated temperatures, pressures and current densities and in extremely acidic conditions over extended lengths of time, said McKenzie Hubert, a graduate student in Jaramillo’s group who led the experiments with Laurie King, a SUNCAT research engineer who has since joined the faculty of Manchester Metropolitan University.

One of the most important elements of the study was scaling up the production of the cobalt phosphide catalyst while keeping it very uniform—a process that involved synthesizing the starting material at the lab bench, grinding with a mortar and pestle, baking in a furnace and finally turning the fine black powder into an ink that could be sprayed onto sheets of porous carbon paper. The resulting large-format electrodes were loaded into the electrolyzer for the hydrogen production tests.

While the electrolyzer development was funded by the Defense Department, which is interested in the oxygen-generating side of electrolysis for use in submarines, Jaramillo said the work also aligns with the goals of DOE’s H2@Scale initiative, which brings DOE labs and industry together to advance the affordable production, transport, storage and use of hydrogen for a number of applications. The fundamental catalyst research was funded by the DOE Office of Science.

, said, “Working with Tom gave us an opportunity to see whether these catalysts could be stable for a long time and gave us a chance to see how their performance compared to that of platinum.

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While the platinum catalyst represents only about 8 percent of the total cost of manufacturing hydrogen with PEM, the fact that the market for the precious metal is so volatile, with prices swinging up and down, could hold back development of the technology, said Katherine Ayers, vice president for research and development at Nel and a co-author of the paper. Reducing and stabilizing that cost will become increasingly important as other aspects of PEM electrolysis are improved to meet the increasing demand for hydrogen in fuel cells and other applications.

The performance of the cobalt phosphide catalyst needs to get a little bit better, and its synthesis would need to be scaled up. But I was quite surprised at how stable these materials were. Even though their efficiency in generating hydrogen was lower than platinum’s, it was constant. A lot of things would degrade in that environment.

—Katherine Ayers

SUNCAT is a partnership between SLAC and the Stanford School of Engineering. Funding for this study came from a Small Business Innovation Research (SBIR) grant from the Department of Defense. Funding for fundamental catalyst development at SUNCAT, which provided the platform for this research, is provided by the DOE Office of Science.

Resources

• Laurie A. King, McKenzie A. Hubert, Christopher Capuano, Judith Manco, Nemanja Danilovic, Eduardo Valle, Thomas R. Hellstern, Katherine Ayers & Thomas F. Jaramillo (2019) “A non-precious metal hydrogen catalyst in a commercial polymer electrolyte membrane electrolyser” Nature Nanotechnology doi: 10.1038/s41565-019-0550-7