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Topological Catalysis Driven by Symmetry-Protected Surface States.

Minghang Li¹, Xiaoming Zhang², Changfeng Chen³

¹School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Gardens Point Campus QLD 4001, Brisbane, Australia.

|January 10, 2026

Summary

Topological surface states (TSSs) in topological crystalline insulators (TCIs) decisively drive electrochemical reactions for clean energy. This study provides the first direct evidence of topological catalysis, confirming its role in hydrogen and oxygen evolution.

Keywords:

Crystalline Topological Insulators Symmetry-Protected Topological Surface States (TSSs)Topological Catalysis

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Area of Science:

Materials Science
Chemistry
Physics

Background:

Topological surface states (TSSs) are theorized to enhance electrochemical reactions crucial for clean energy.
Direct evidence for topological catalysis is lacking due to interference from trivial bulk states and surface dangling bonds.

Purpose of the Study:

To provide direct evidence of topological catalysis.
To isolate and demonstrate the catalytic role of TSSs.
To identify suitable materials for superior catalytic performance.

Main Methods:

Investigated topological crystalline insulators (TCIs) of the SnX family (X = Te, S, or Se).
Utilized the unique mirror-symmetry-protected TSSs in TCIs, tunable by crystal symmetry breaking.
Minimized impact on trivial bulk and dangling bond states to isolate TSS effects.

Main Results:

Demonstrated that TSSs are a decisive factor in hydrogen and oxygen evolution reactions.
Provided compelling evidence for the phenomenon of topological catalysis.
Showcased TCIs as a promising material class for advanced catalysis.

Conclusions:

Topological surface states are confirmed as key drivers in catalytic processes.
Topological crystalline insulators offer a pathway to enhanced catalytic efficiency for clean energy applications.