【#Tech24H】The Dalian Institute of Chemical Physics, Chinese Academy of Sciences, has constructed the world’s first gas-solid hydrogen negative ion prototype battery using hydrogen and metal as electrodes. The hydrogen negative ion is the “electron-rich” state of hydrogen. Using hydrogen negative ions as charge carriers offers both high reactivity and high energy, representing a key pathway for the development of next-generation all-solid-state batteries. However, hydrogen negative ions are extremely unstable under natural conditions, making it difficult for scientists to directly use them for electrochemical energy storage. The team assembled the first gas–solid hydrogen negative ion battery capable of operating over a wide temperature range, using magnesium metal and hydrogen gas as the anode and cathode active materials, respectively. This battery allows hydrogen negative ions to provide high energy while cleverly coupling with electrochemical hydrogen storage, enabling simultaneous charge/discharge and hydrogen storage/release. This original achievement provides a brand-new technical route to solve the core challenge of hydrogen storage that has hindered hydrogen energy utilization, eliminating the need for extreme conditions such as high pressure in conventional hydrogen storage and potentially giving rise to new hydrogen storage technologies.  [ By Zhang Liyan | Tang Ruohan ]