Core Insights - A research team from Tokyo University of Science has developed a high-performance solid electrolyte capable of reversible hydrogen absorption and release at 90 degrees Celsius, potentially enabling practical magnesium-based hydrogen storage technology [1][2] - Magnesium is considered an ideal hydrogen storage medium due to its low cost and high theoretical hydrogen storage capacity, but its hydrogen absorption and release reactions typically require temperatures above 300 degrees Celsius, limiting practical applications [1] Group 1: Research Findings - The research team explored combinations of various metal hydrides, specifically barium hydride, calcium hydride, and sodium hydride, to identify the optimal ratio through extensive experimentation [1] - The resulting mixture exhibits a crystal structure similar to known superionic conductors and demonstrates high hydrogen anion conductivity at 25 degrees Celsius [1] - The material maintains stability over a wide potential range without decomposition, a significant improvement over previous hydrogen anion conductors [1] Group 2: Applications and Implications - Based on the solid electrolyte, researchers constructed a magnesium-hydrogen battery, which showed a reversible hydrogen gas absorption capacity of 2030 milliampere-hours per gram at 90 degrees Celsius, nearly reaching magnesium's theoretical hydrogen storage limit [1] - The development of safe and efficient hydrogen storage technology is crucial for realizing a hydrogen energy society, with potential applications in renewable energy storage and fuel cell vehicles [2]