Deforming lanthanum trihydride for superionic conduction

Weijin Zhang, Jirong Cui, Shangshang Wang, Hujun Cao (), Anan Wu, Yuanhua Xia, Qike Jiang, Jianping Guo, Teng He and Ping Chen ()
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Weijin Zhang: Chinese Academy of Sciences
Jirong Cui: Chinese Academy of Sciences
Shangshang Wang: Chinese Academy of Sciences
Hujun Cao: Chinese Academy of Sciences
Anan Wu: Xiamen University
Yuanhua Xia: Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics
Qike Jiang: Chinese Academy of Sciences
Jianping Guo: Chinese Academy of Sciences
Teng He: Chinese Academy of Sciences
Ping Chen: Chinese Academy of Sciences

Nature, 2023, vol. 616, issue 7955, 73-76

Abstract: Abstract With strong reducibility and high redox potential, the hydride ion (H−) is a reactive hydrogen species and an energy carrier. Materials that conduct pure H− at ambient conditions will be enablers of advanced clean energy storage and electrochemical conversion technologies1,2. However, rare earth trihydrides, known for fast H migration, also exhibit detrimental electronic conductivity3–5. Here we show that by creating nanosized grains and defects in the lattice, the electronic conductivity of LaHx can be suppressed by more than five orders of magnitude. This transforms LaHx to a superionic conductor at −40 °C with a record high H− conductivity of 1.0 × 10−2 S cm−1 and a low diffusion barrier of 0.12 eV. A room-temperature all-solid-state hydride cell is demonstrated.

Date: 2023
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DOI: 10.1038/s41586-023-05815-0

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