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Overcoming barriers of hydrogen storage with a low-temperature hydrogen battery
Scientists develop a solid electrolyte, utilizing which the battery stores and releases hydrogen at temperatures below 100 degrees Celsius A hydrogen battery that operates at just 90 °C has been developed by researchers from Japan, overcoming the high-temperature and low-capacity limits of earlier methods. The device works by moving hydride ions through a solid electrolyte, allowing magnesium hydride, which acts as the anode, to repeatedly store and release hydrogen at full capacity.
Until recently, this approach was limited by the need for high operating temperatures above 300 °C, poor reversibility of hydrogen absorption and desorption, and unwanted side reactions that reduced performance. In this structure, barium, calcium, and sodium occupy body-centered positions, while H – move through face-sharing tetrahedral and octahedral sites, allowing them to migrate freely. Tests showed that the material has high ionic conductivity at room temperature (2.1 × 10-5 S cm-1) and electrochemical stability, making the system effective for long-term hydrogen storage and release.
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