Plate Nº 10 · recorded October 9, 2026
Chemistry & MaterialsReported finding
New Electrode Design Breaks Energy Barrier in Green Ammonia Production
Monash University chemists achieved 96% faradaic efficiency in ammonia synthesis using gallium-based lithium-alloying electrodes, breaking a long-standing energy-efficiency barrier.
By Elena Vasquez3 min read651 words
In brief
- Researchers achieved a faradaic efficiency of 96% ± 6% for ammonia production using new lithium-alloying cathodes.
- The estimated energy efficiency of future systems could reach at least 22%.
- The study was published in Cell Press Blue in 2026 (DOI: 10.1016/j.cpblue.2026.100130).
- The electrode uses gallium-based materials that alloy with lithium, replacing conventional lithium-metal electrodes.
- The research was led by Monash University with colleagues at RMIT University.
Chemists in Australia have pushed ammonia production to a faradaic efficiency of 96% ± 6% using a redesigned electrode, overcoming a fundamental energy limit that has constrained electrochemical ammonia synthesis for years.
Researchers at Monash University in Melbourne, working with colleagues at RMIT University, developed a lithium-alloying electrode based on gallium that dramatically cuts the energy needed to convert nitrogen gas into ammonia. The study, published in Cell Press Blue (DOI: 10.1016/j.cpblue.2026.100130), points toward cleaner and potentially cheaper ways to make one of the world's most important industrial chemicals.
Ammonia underpins global agriculture as the basis of nitrogen fertilizers, and researchers increasingly view it as a possible carbon-free fuel and energy carrier. Today's production, however, depends on large, centralized plants that run on fossil fuels and cannot easily tap into geographically dispersed or stranded renewable energy.
What was the barrier?
The most established electrochemical approach uses lithium to activate nitrogen gas, a molecule so exceptionally stable that it resists conversion into ammonia by most other means. The method can produce ammonia at practical rates, but its chemistry imposes a built-in ceiling on energy efficiency — one that scientists long regarded as intrinsic to the process.
The Monash team changed that equation by changing the cathode itself. Instead of depositing lithium metal onto a conventional electrode, they used gallium-based materials that combine with lithium to form an alloy. This allows the lithium-mediated reaction to run at substantially more favorable electrical potentials while still activating nitrogen and producing ammonia.
"Electrolytic synthesis of ammonia from renewables is possible, but present-day technology is fundamentally limited by low energy efficiencies and high costs," said lead author Dr. Rebecca Hodgetts of the Monash School of Chemistry.
"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."
How efficient is it?
Under optimized laboratory conditions, nearly all the electrical current flowing through the cell ended up in ammonia rather than in unwanted side reactions — a faradaic efficiency of 96% ± 6%. (Faradaic efficiency measures how much of the electric charge goes into the desired product.)
The findings suggest future electrochemical systems could reach an estimated energy efficiency of at least 22%. That figure still falls short of proposed commercial targets, and the researchers are careful to frame their result as proof of concept rather than a finished technology. But the study demonstrates, for the first time, that the longstanding energy barrier can be broken through electrode design alone.
Emeritus Professor Douglas MacFarlane, also of the School of Chemistry, said the discovery widens the field's chemical toolbox.
"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."
What comes next?
The gap between a laboratory cathode and a practical ammonia plant remains large. Professor Alexandr Simonov said the team's next step is to build hardware that mimics real operating conditions.
"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," Simonov said. "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."
If the scaling succeeds, the researchers say the work could enable decentralized ammonia production — making fertilizer and fuel closer to where they are needed, using renewable electricity from sources that conventional plants cannot reach.
For now, the result stands as a demonstration that a limit once considered fundamental was, in fact, a design choice.
via Phys.org Chemistry (Source)
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