Hydrogen negative ion conductors have broad application prospects in fields such as hydrogen negative ion batteries, fuel cells, and electrochemical conversion pools, and are expected to lead a series of energy technology innovations in the future. Chinese scientists have recently developed the first ultrafast hydrogen negative ion conductor under mild conditions by introducing a large number of defects and grain boundaries into the lattice of lanthanum hydride through mechanochemical methods. The reporter learned from the Chinese Academy of Sciences that the research was completed by Chen Ping, a researcher from Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and Cao Hujun, an associate researcher team. The relevant results were published in the international academic journal Nature on the 5th. Hydrogen negative ions are a type of hydrogen carrier and energy carrier with great development potential. Hydrogen negative ion conductors are materials with excellent hydrogen negative ion conductivity under certain conditions. This field of research faces problems such as limited material systems and high operating temperatures, making it a cutting-edge topic in the field of clean energy. High quality hydrogen negative ion conductors require two characteristics to have both excellent hydrogen negative ion conductivity and extremely low electronic conductivity. "Chen Ping introduced that as early as the 20th century, lanthanum hydride was discovered to have rapid hydrogen migration ability, but electronic conductivity was very high. In recent years, researchers have introduced oxygen into the lattice of lanthanum hydride to suppress its electronic conduction, but the introduction of oxygen also significantly hinders the conduction of hydrogen negative ions. Chen Ping and Cao Hu's team innovatively adopted mechanical ball milling method, which caused distortion of lanthanum hydride lattice through impact and shear force, forming a large number of nanocrystals and lattice defects. These distortions can significantly suppress electronic conduction, resulting in a decrease of more than 5 orders of magnitude in electronic conductivity compared to well crystallized lanthanum hydride. At the same time, the interference with hydrogen negative ion conduction is not significant, resulting in excellent hydrogen negative ion conduction characteristics. More importantly, this study achieved ultrafast conduction of hydrogen negative ions under mild conditions (-40 ° C to 80 ° C). In previous studies, hydrogen negative ion conductors could only achieve ultrafast conduction at around 300 degrees Celsius. In addition, the team also realized the discharge of room temperature all solid hydrogen negative ion battery for the first time. Many known hydride materials are ion electron hybrid conductors, and the material engineering strategy established by the team has certain universality, which is expected to help research on hydrogen negative ion conductors achieve more breakthroughs, "said Chen Ping. (New News Agency)
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