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Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures

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Deforming lanthanum trihydride for superionic conduction.

Weijin Zhang¹, Jirong Cui^1,2, Shangshang Wang^1,2

¹Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China.

|April 5, 2023

Summary

This summary is machine-generated.

Researchers developed a new material for clean energy storage. By engineering lanthanum hydride (LaHₓ) with nanosized grains and defects, they achieved a superionic conductor with high hydride ion conductivity, enabling a room-temperature solid-state hydride cell.

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Hydride ion (H⁻) is a reactive hydrogen species and energy carrier with strong reducibility and high redox potential.
Materials conducting pure H⁻ are crucial for clean energy storage and electrochemical conversion.
Rare earth trihydrides offer fast H⁻ migration but suffer from detrimental electronic conductivity.

Purpose of the Study:

To suppress electronic conductivity in rare earth trihydrides.
To develop a material enabling pure hydride ion conduction at ambient conditions.
To demonstrate a functional all-solid-state hydride cell.

Main Methods:

Synthesizing lanthanum hydride (LaHₓ) with nanosized grains and lattice defects.
Measuring hydride ion and electronic conductivity.
Fabricating and testing a room-temperature all-solid-state hydride cell.

Main Results:

Electronic conductivity of LaHₓ suppressed by over five orders of magnitude.
LaHₓ achieved superionic conductor status at -40°C.
Record high H⁻ conductivity of 1.0 × 10⁻² S cm⁻¹ with a low diffusion barrier of 0.12 eV.

Conclusions:

Engineered LaHₓ exhibits significantly reduced electronic conductivity and enhanced ionic conductivity.
This breakthrough enables the development of advanced clean energy storage technologies.
A functional room-temperature all-solid-state hydride cell was successfully demonstrated.