Scientists unveil a fully compostable soft robot that performs like conventional systems and vanishes in soil without toxic waste.
Global electronic waste reached approximately 62 million metric tons in 2022, with soft robots—widely applied in healthcare, agriculture, and environmental monitoring—contributing to this accumulation.
A persistent challenge has been the trade-off between biodegradability and performance: materials that biodegrade typically exhibit poor functionality, whereas high-performance materials lack biodegradability.A research team from Seoul National University , Sogang University, and Johannes Kepler University Linz has addressed this trade-off. They have developed the first fully compostable soft robotic system that matches the durability of conventional robots while fully decomposing in soil, leaving no toxic residues.Built to last, designed to disappearThe robot’s structural frame is constructed from poly , a water-free biodegradable elastomer characterized by low hysteresis and strong elastic recovery.This PGS-based bending actuator maintained consistent bending angles and output forces over 1 million actuation cycles, and also showed stable performance after extended storage—a critical requirement for robots designed for real-world deployment beyond laboratory conditions.The system’s embedded electronics are similarly unconventional. Rather than traditional metal and semiconductor components, biodegradable inorganic electronics were employed, decomposing concurrently with the structural frame.This integration results in a fully degradable system—both the structure and the electronics—that decomposes cleanly, leaving no residual waste.Composting a robotWhen the complete robotic system was subjected to industrial composting conditions, both its structural components and electronic elements decomposed within a few months.Subsequent plant growth tests on the resulting compost confirmed the absence of environmental toxicity. This indicated that the robot not only degrades but also produces a usable soil amendment.The research team further demonstrated practical field applications. Biodegradable inorganic electronic components made from magnesium , molybdenum , and silicon were combined to include sensors for curvature, strain, touch, temperature, humidity, and pH, as well as heaters, electrical stimulators, and drug-delivery modules, all within a single soft robotic finger.This shows a highly integrated, multifunctional biodegradable electronic platform.These agricultural use cases illustrate scenarios where leaving the robot in the field does not pose an environmental liability.Setting a new benchmark“This research overcomes the limitations traditionally associated with biodegradable materials and demonstrates soft robotic and electronic systems with practical levels of durability and performance,” Professor and lead researcher Seung-Kyun Kang of Seoul National University emphasized the significance of the work. He also added that it “sets a new benchmark for sustainable robotics.”This research addresses a growing oversight in the robotics industry regarding end-of-life considerations.While most discussions on sustainable technology focus on energy efficiency or operational emissions, few discuss what ultimately happens to robotic hardware after its functional life ends.As the global soft robotics market is expected to grow rapidly, the safe disposal of these devices will become increasingly important.The demonstrated robot, capable of enduring one million cycles and then decomposing without residue, directly addresses these waste challenges and redefines what it means for a robot to be truly disposable.These findings were published in the journal Nature Sustainability.
Compostable Robot Green Technology PGS Elastomer Science Seoul National University Soft Robotics
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