A Compact Device Generates Water, Oxygen, and Fuel from Lunar Soil

Solar energy systems can generate water, oxygen, and fuel from lunar regolith for future settlements of lunar explorers.

It has been established that significant amounts of water are bound in the minerals of the moon. However, methods proposed for extracting resources from lunar regolith typically involve complex and energy-heavy techniques that aren’t practical for long-lasting lunar colonies.

Recently, Lu Wang and his team at the Chinese University of Hong Kong discovered that a relatively straightforward solar-powered nuclear reactor could yield useful materials simply by exposing lunar regolith to sunlight and utilizing them through astronauts.

In their experiments, the researchers utilized lunar samples obtained from China’s Chang’e 5 mission, along with simulated samples made from Earth-based rocks.

During the operation of the reactor, sunlight first extracts water from the lunar soil, and then the soil facilitates a reaction between CO₂ and water to produce carbon monoxide, oxygen, and hydrogen, which can serve as fuel.

While lunar soil contains various minerals that can aid in these reactions, a compound known as ilmenite is highlighted as a key catalyst, according to Wang.

“The mechanisms of these chemical reactions are quite fascinating and could lead to the creation of essential lunar resources,” says Haihui Joy Jiang, who was not part of the research team at the University of Sydney in Australia.

“We still need to address several questions and direct future research to determine if this process is applicable in a practical, feasible, and scalable manner on the moon,” Jiang adds.

Wang acknowledges the challenges of expanding this process to produce sufficient water, oxygen, and fuel to support a lunar colony. “The moon’s extreme environment presents unique challenges, including severe temperature variations, a high vacuum, intense solar radiation, and low gravity,” he notes. “Moreover, the variability in lunar soil and scarcity of co-resources pose considerable hurdles to technical implementation.”