New electrode design breaks key barrier to greener ammonia production

Gaby Clark

Scientific Editor

Robert Egan

Senior Editor

A new approach to producing ammonia using renewable electricity has overcome a fundamental energy limitation of the technology, opening new possibilities for cleaner and potentially more cost-effective production of one of the world's most important chemicals.

Researchers from Monash University in Melbourne, Australia, have developed a new type of lithium-alloying electrode that significantly reduces the energy required to convert nitrogen gas into ammonia, a breakthrough that could help advance the transition away from fossil-fuel-based ammonia production.

Ammonia is essential to global agriculture, particularly as the basis of nitrogen fertilizers, and is increasingly being explored as a carbon-free fuel and energy carrier. However, conventional ammonia production relies on large, centralized facilities that cannot readily exploit geographically dispersed or stranded renewable energy.

Published in Cell Press Blue, the research tackles one of the major obstacles facing electrochemical ammonia production: energy efficiency.

Breaking lithium's energy efficiency barrier

The most established electrochemical approach uses lithium to help activate nitrogen gas, an exceptionally stable molecule that is otherwise difficult to convert into ammonia. While the method can produce ammonia at practical rates, its chemistry imposes an intrinsic limit on how energy-efficient the process can become.

The researchers, also working with colleagues at RMIT University, have now demonstrated that changing the chemistry of the cathode itself can overcome that limitation.

Lead author Dr. Rebecca Hodgetts, from the Monash University School of Chemistry, said the new cathode materials effectively changed the boundaries of what was thought possible.

"Electrolytic synthesis of ammonia from renewables is possible, but present-day technology is fundamentally limited by low energy efficiencies and high costs," Hodgetts said.

"Our new cathode materials change the rules of the game by redefining this fundamental limit and opening up previously unexplored opportunities for more energy- and cost-effective production of green ammonia."

Gallium alloys expand the chemistry

Instead of producing lithium metal on a conventional electrode, the researchers used gallium-based materials that combine with lithium. This allows the lithium-mediated reaction to occur at substantially more favorable electrical potentials while retaining the ability to activate nitrogen and produce ammonia.

Under optimized experimental conditions, the researchers achieved ammonia production with a faradaic efficiency of 96% ± 6%, meaning almost all the electrical current was directed toward producing ammonia.

The research findings could support future electrochemical ammonia production with an estimated energy efficiency of at least 22%. While further improvements are required to reach proposed commercial targets, the researchers say the study provides proof of concept that the longstanding energy barrier can be overcome through electrode design.

Emeritus professor Douglas MacFarlane, also with the School of Chemistry, said the discovery also expands the chemistry available to researchers working on renewable ammonia production.

"The field has essentially been limited to a single cathode process based on lithium-mediated nitrogen reduction," MacFarlane said.

"Introducing lithium-alloying materials broadens that chemistry considerably. Instead of being constrained to one composition, we can begin exploring different combinations of materials capable of activating the extremely unreactive nitrogen molecule under relatively mild conditions."

From laboratory cathodes to practical electrolyzers

Professor Alexandr Simonov, also from the School of Chemistry, said the next challenge is translating the discovery from laboratory experiments into practical electrolyzers.

"Our next key step is to integrate these new lithium-alloying cathodes into electrolyzer prototypes that more closely mimic the conditions needed for practical ammonia production," said Simonov.

"We are also working to scale up the cathodes and demonstrate long-term ammonia production at competitive energy efficiency. That will be critical to taking this technology toward commercial application."

The researchers say the work could ultimately contribute to more sustainable and decentralized ammonia production, using renewable electricity to produce ammonia closer to where it is needed while making use of geographically dispersed or stranded renewable energy.

Publication details

Improved energy efficiency of nitrogen reduction to ammonia provided by lithium-alloying cathodes, Cell Press Blue (2026). DOI: 10.1016/j.cpblue.2026.100130. www.cell.com/cell-press-blue/f … 3051-3839(26)00128-3

Journal information:

Cell Press Blue

Provided by Monash University

Citation: New electrode design breaks key barrier to greener ammonia production (2026, October 8) retrieved 8 October 2026 from https://phys.org/news/2026-10-electrode-key-barrier-greener-ammonia.html