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Updated: May 18, 2026

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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Published on: August 15, 2018

Switchable Local Ferroelectric Order Enables Reversible HER Modulation in Irradiated 2H-MoTe₂.

Li Ma¹, Bo Liu¹, Chongyang Tang¹

¹School of Physics and Technology, Wuhan University, Wuhan, Hubei 430072, China.

ACS Applied Materials & Interfaces

|May 16, 2026

Summary

This summary is machine-generated.

Ar+ ion beam irradiation creates defects in 2H-MoTe2, inducing room-temperature ferroelectricity. This defect engineering enhances hydrogen evolution reaction (HER) activity by optimizing catalytic performance through polarization switching.

Keywords:

defect ferroelectric polarization hydrogen evolution reaction ion beam irradiation

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Two-dimensional transition metal chalcogenides offer tunable electronic properties.
Achieving switchable room-temperature ferroelectricity in these materials is a significant challenge.

Purpose of the Study:

To demonstrate Ar+ ion beam irradiation as a method to induce ferroelectricity in 2H-MoTe2.
To investigate the relationship between ferroelectric polarization and catalytic activity.

Main Methods:

Ar+ ion beam irradiation to create tellurium vacancies.
Polarization-resolved second-harmonic generation (SHG) microscopy.
Low-temperature spectroscopy and switching spectroscopy piezoresponse force microscopy (SS-PFM).
Linear sweep voltammetry (LSV) to assess hydrogen evolution reaction (HER) activity.

Main Results:

Controlled Te vacancies induced robust out-of-plane ferroelectric polarization at 300 K.
Ion-beam irradiation caused symmetry breaking and formed switchable ferroelectric domains.
Reversible 180° polarization switching was confirmed via SS-PFM.
HER activity was reversibly modulated by polarization switching, with optimized hydrogen adsorption free energy.

Conclusions:

Defect-engineered ferroelectric polarization in 2H-MoTe2 enhances HER activity.
Ferroelectric polarization is a key descriptor for electrocatalytic enhancement.
This work provides a defect-engineering strategy for designing adaptive nanocatalysts.