High-capacity, reversible hydrogen storage using H--conducting solid electrolytes

• 成果类型: Article
• 署名作者: Hirose, Takashi; Matsui, Naoki; Itoh, Takashi; Hinuma, Yoyo; Ikeda, Kazutaka; Gotoh, Kazuma; Jiang, Guangzhong; Suzuki, Kota; Hirayama, Masaaki; Kanno, Ryoji
• 署名单位: National Institute of Advanced Industrial Science & Technology (AIST); High Energy Accelerator Research Organization (KEK); Japan Advanced Institute of Science & Technology (JAIST)
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-11929
• DOI: 10.1126/science.adw1996
• 发表日期: 2025-09-18
• 页码: 1252-1255
• 关键词: proton conductivity; molecular-dynamics; batteries; transitions; mobile

摘要

Hydrogen absorption and desorption in solids are pivotal reactions involved in batteries and hydrogen storage devices. However, conventional thermodynamic and electrochemical hydrogen storage using high-capacity materials suffers from high hydrogen-desorption temperatures and instability of electrolytes. In this work, we explored electrochemical hydride ion (H-)-driven hydrogen storage and developed a solid electrolyte, anti-alpha-AgI-type Ba0.5Ca0.35Na0.15H1.85, which exhibits excellent H- conductivity and electrochemical stability. This electrolyte is compatible with several metal-hydrogen electrodes, such as titanim hydride and magnesium hydride (MgH2), allowing for high-capacity, reversible hydrogen storage at low temperatures. Specifically, Mg-H2 cells operating as hydrogen storage devices (Mg + H2 -><- MgH2) achieved a reversible capacity of 2030 milliampere hours per gram at 90 degrees C, offering safe and efficient hydrogen-electricity conversion and hydrogen storage devices.