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Highly Stable Twin Defects Enabled by High Entropy Configuration.

Yaqing Guo1,2, Jiachi Hong3, Qianwen Dong4

  • 1College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, China.

Angewandte Chemie (International Ed. in English)
|December 26, 2025
PubMed
Summary
This summary is machine-generated.

Researchers engineered stable twin defects in carbon-confined FeCoNiMn nanocatalysts (T-FeCoNiMn/C). Entropy-driven stabilization enhances catalytic performance for oxygen evolution reactions, offering new strategies for catalyst design.

Keywords:
Atomic‐scale strainCatalysisEntropyIn situ TEMTwin defects rotation

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Crystalline defects enhance metallic catalyst efficiency.
  • Controlling defects in nanosized, multi-element alloy catalysts is challenging due to complex interactions and defect metastability.

Purpose of the Study:

  • To report concentrated and stable twin defects in carbon-confined FeCoNiMn nanocatalysts (T-FeCoNiMn/C).
  • To investigate entropy-sensitive formation mechanisms and durable catalytic performance of these defects.
  • To offer new strategies for catalytic structural engineering.

Main Methods:

  • Integration of deep learning, in situ transmission electron microscopy (TEM), and molecular dynamics simulations.
  • Analysis of atomic-scale strain distribution and multi-step formation dynamics of twin defects.
  • Characterization of catalytic performance for oxygen evolution reactions.

Main Results:

  • Concentrated and stable twin defects were successfully formed and stabilized in T-FeCoNiMn/C.
  • Entropy-enhanced multielement composition provides flexible atomic configurations and a broad energy landscape, favoring twin defect stability.
  • Stable twin defects persisted throughout synthesis and catalytic applications.

Conclusions:

  • Entropy-driven stabilization of twin defects in metallic nanocatalysts is demonstrated.
  • The findings offer novel strategies for engineering defect structures in nanocatalysts for improved performance.
  • T-FeCoNiMn/C exhibits durable catalytic activity for oxygen evolution reactions due to stable twin defects.