The researchers studied how to separate deuterium isotopes using a special type of water electrolysis. They used an anion-exchange membrane (AEM) and found that it was better at separating deuterium than the more commonly used cation-exchange membrane (PEM). By adjusting the ratio of water to current, they improved the separation performance of the AEM electrolysis. The experiments showed that the AEM electrolysis could keep working even at lower water ratios, unlike the PEM type. This research could help in developing better methods for producing hydrogen, which is important for clean energy solutions.