Posted on 04/30/2026 9:14:06 PM PDT by Red Badger
The concept uses hydrogen, oxygen, and argon to enable stable combustion.
Aristidis Dafis and Hermann Rottengruber, PhD, with a one-cylinder experimental engine. Jana Dünnhaupt / Uni Magdeburg
Researchers in Germany have recently unveiled a hydrogen-powered engine that could challenge diesel in some of the toughest applications by operating without emissions and achieving efficiency levels above 60 percent.
Developed by a research team at the Otto-von-Guericke University Magdeburg, the so-called hydrogen cycle engine operates in a closed loop and reuses most of its working gases after each cycle.
The project was led by Hermann Rottengruber, PhD, a professor at the university’s Institute for Engineering of Products and Systems (IEPS). It was also backed by the Federal Ministry for Economic Affairs and Energy of Germany.
“This approach could become particularly important in applications where engines must operate under high loads for long periods, be highly robust, and deliver significant power,” Rottengruber pointed out.
A zero emissions engine
The innovative concept utilizes a carefully balanced mix of hydrogen, oxygen and argon. While hydrogen serves as the energy source, oxygen enables the reaction, and argon, which is a chemically inert noble gas, acts as a stable carrier.
Because argon does not burn or react under operating conditions, it helps create more controlled thermodynamic conditions inside the engine. This, as a result, improves the system’s efficiency and stability.
Unlike a traditional combustion system, most of the gas mixture in this engine stays inside the system and is reused. It’s cooled, processed and fed back into the cycle after each power stroke.
The system removes only specific byproducts, while it separates and liquefies the hydrogen involved in the reaction. This unique design enables the engine to run without producing conventional exhaust emissions.
For the project, the team tested multiple variants of the so-called Argon Power Cycle engine on a dedicated test bench, along with their colleagues from WTZ Roßlau gGmbH, a research institute specializing in engine technology, energy conversion and future fuels. They also validated performance through detailed computer simulations.
Clean power solution
The results revealed that the engine could combine high output with exceptional efficiency (over 60 percent), as it is capable of delivering power levels comparable to those of diesel engines. This makes it especially attractive for heavy-duty applications where both performance and durability are critical.
These include sectors where battery-electric solutions often struggle as a result of weight, range limitations, and charging infrastructure requirements, such as long-haul trucks, agricultural machinery, construction equipment and stationary power generators.
But, according to Rottengruber, the closed-loop design could also offer economic advantages. “In our assessment, the closed system could be more cost-effective over realistic operating periods than an open hydrogen combustion engine,” he stated in a press release.
This, the expert believes, is partly because of the elimination of expensive exhaust treatment systems and the high efficiency of the process, which could offset the engine’s greater technical complexity over time.
Still, the current concept faces limits in power density, as only a certain amount of hydrogen can be injected during each cycle. The team also noted that the carbon dioxide could accumulate in the system, for instance, through the combustion of lubricants.
“Both of these factors could affect efficiency and engine performance and must be taken into account in further developments,” Rottengruber elaborated. The concept is already attracting interest from the industry. “Leading manufacturers of marine propulsion systems have already expressed strong interest, as pressure is growing, particularly in this sector, to make climate-neutral solutions available by 2050,” he concluded.
Diesel Knock!.................
How is that Hydrogen stored?
The engine has never been the issue, just like electric motors have never been the issue holding back EV.
it would be cool if you could extract it from water
We need to keep in mind that hydrogen is energy storage, not an energy source.
Electrolysis of water already exists, but will never be cheaper than steam methane reforming, even with use of nuclear power that could be used for better things.
Probably in a metal hydride. Similar to a NiMH battrey:
https://www.fuelcellstore.com/metal-hydrides
Lakehurst, NewJersey
Just one little accident and people never let you live it down.................
What’s the worst that can happen when a portable hydrogen pressure vessel explodes?
yeah it takes too much energy to extract it, but at least it’s a neat way to store “fuel”
Sure, that (((USES))) electricity.
Yes, Hydrogen and Oxygen will work. They send rockets to the moon.
So is this a good time to buy Argon futures? Does obtaining Argon involve strip-mining? Are all of the American Argon supply in California, or some other place that hates America>
Argon is an inert gas that is naturally in the air in small amounts. It is the third most abundant atmospheric gas (0.934%), it is produced via fractional distillation of liquid air.
Welders use it by the tankful. It keeps the welds from oxidizing while being made super hot.........
Something wrong here. Heat engines are limited by the heat sink temperature and the high temperature. Typical efficiency is around 20%. They are claiming 60% which seems to break the laws of physics.
Could perhaps have some special-purpose application for unusual situations requiring zero-emissions, but limited practicality.
By the term Heat Engines, does this include Stirling engines that you can buy or make miniature working models of?
If the system works by oxidizing hydrogen, it produces an emission so to speak - water vapor.
Unless they are capturing that water vapor, which they’d have to condense to water.
I’d have to care enough to read more.
this smells of a perpetual motion machine, at the moment.
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