Controllable Electrocatalytic to Photocatalytic Conversion in Ferroelectric Heterostructures

Area of Science:

• Materials Science
• Catalysis
• Surface Chemistry

Background:

• Photocatalytic and electrocatalytic reactions are crucial for sustainable chemical production, addressing energy and environmental challenges.
• Photocatalysis uses light and semiconductors, while electrocatalysis uses electricity and metals, with distinct mechanisms limiting their interconversion.
• The exploration of converting between photocatalytic and electrocatalytic types remains a significant research gap.

Purpose of the Study:

• To investigate the potential of ferroelectric heterostructures for tunable photocatalytic and electrocatalytic applications.
• To demonstrate the electronic phase transition capabilities of Mo-BN@In2Se3 and WSe2@In2Se3 heterostructures.
• To bridge the understanding of electronic phase transitions with chemical reaction performance.

Main Methods:

• Density Functional Theory (DFT) simulations were employed to model and analyze the electronic and catalytic properties.
• The study focused on ferroelectric heterostructures, specifically Mo-BN@In2Se3 and WSe2@In2Se3.
• The nitrogen reduction reaction (NRR) and hydrogen evolution reaction (HER) were used as model systems to evaluate catalytic activity.

Main Results:

• Ferroelectric heterostructures Mo-BN@In2Se3 and WSe2@In2Se3 exhibit tunable semiconducting or metallic properties based on polarization direction.
• Metallic heterostructures demonstrated excellent electrocatalytic performance for NRR and HER.
• Semiconducting heterostructures showed enhanced photocatalytic activity, including improved optical absorption and charge separation.

Conclusions:

• Ferroelectric heterostructures offer a novel platform for designing dual-function catalysts.
• The ability to switch electronic states provides a versatile approach to optimize catalytic efficiency.
• This work presents a new strategy for improving both photocatalytic and electrocatalytic performance through controlled electronic phase transitions.