Researchers achieve superionic hydride ion conduction at ambient temperatures

Materials that can conduct negatively charged hydrogen atoms in ambient conditions could pave the way for advanced clean energy storage and electrochemical conversion technologies. A research team from the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences demonstrated a technique that enables a room-temperature all-solid-state hydride cell by introducing and exploiting defects in the lattice structure of rare earth hydrides.

With strong reducibility and high redox potential, hydride ion conductors have emerged as promising candidates for this technology. Several Hconductors have already been developed in recent years, including alkaline earth metal hydrides and oxyhydrides of alkaline earth and rare earth metals, which are known for fast hydrogen migration.

Strategies to enhance electronic conductivities typically seek to diminish crystallographic imperfections for applications like metallic nanowire interconnects and nanostructured photovoltaic semiconductors. In this study, however, the research team purposely created abundant discrete nanosized grains and lattice defects to disturb the path of electron transport in REHand suppress the electronic conductivity.

"By creating nano-sized grains, defects and other crystalline mismatched zones in a known ionic-electronic mixed conductor, we demonstrated that the electronic conductivity of LaH can be largely suppressed by five orders of magnitude," said Chen."Engineering such a material could transform LaHinto a pure hydride ion conductor with record high conductivities in the temperature range of -40℃ to 80℃.

"This work demonstrates the effectiveness of lattice deformation in suppressing electron conduction in REHThe researchers plan to explore the physics underneath the phenomenon and extend the method developed in this study to other hydride

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