# 1.5-cm hydrogen-water micro actuator delivers over 20 N and 7200 cycles without refueling

- Published: 2026-11-07 19:59 UTC
- Section: Machines & Making › Robots
- Tags: combustion micro actuator, reactant regeneration, hydrogen and water cycle, electrolysis, underwater cavitation, impulsive actuation, small robotic platforms, Science Advances
- URL: https://realtech.media/news/rt-ba2e2f55b7ba1a2f5061a66b_1_5_cm/

**Researchers demonstrated a laboratory prototype combustion actuator that regenerates its fuel from water by electrolysis, removing the need for external refueling.**

![1.5-cm hydrogen-water micro actuator delivers over 20 N and 7200 cycles without refueling](https://realtech.media/media/2026/11/6a3b00597a811c8b.jpg)
*Frédéric Kuhlmann, Wikimedia Commons, CC BY-SA 3.0*

A research team reported in Science Advances a 1.5-centimeter combustion-based micro actuator that regenerates its own fuel. It generates forces above 20 newtons and operates for more than 7200 cycles without refueling [1].

Combustion gives micro actuators powerful impulsive action comparable to that of natural organisms, but dependence on external fuel limits their development. The authors propose a closed-cycle strategy: hydrogen and water are interconverted in both directions, so electrolysis and combustion reactions replenish the reactants in real time [1].

According to the authors, the number of cycles without refueling is two orders of magnitude higher than for existing combustion-based actuators. Experiments covered removing obstacles, jetting, and striking via underwater cavitation across different environments [1]. The authors say the actuator can be integrated into small robotic platforms so that they can actively reconfigure their local surroundings.

## Sources

1. [Science Advances](https://doi.org/10.1126/sciadv.aei8257)

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Source: RealTech, realtech.media — https://realtech.media/news/rt-ba2e2f55b7ba1a2f5061a66b_1_5_cm/