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Updated: Jul 12, 2026

$In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries$

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Operando Electrochemical Phase Engineering Overcomes Activity-Stability Trade-Off in Perovskite Electrocatalysts.

Shiqing Hu^1,2, Bingjie Pang^1,3, Wei Tu^1,4

¹State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, China.

Angewandte Chemie (International Ed. in English)

|July 10, 2026

Summary

This summary is machine-generated.

This study introduces electrochemical phase engineering (ECPE) to regenerate electrocatalyst active sites during operation. This method overcomes the activity-stability trade-off, enhancing performance in electrochemical devices.

Keywords:

CO2 electroreduction electrocatalyst regeneration perovskite oxide phase engineering solid oxide electrolysis cells

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Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Electrocatalysts face a critical activity-stability trade-off, limiting device performance.
Highly active sites often degrade rapidly under operating conditions.
Developing stable and active electrocatalysts is crucial for energy conversion technologies.

Purpose of the Study:

To develop a strategy for dynamic regeneration of electrocatalyst active sites.
To overcome the inherent activity-stability limitations in electrocatalysts.
To demonstrate a novel approach for enhancing the durability of solid oxide electrolysis cells.

Main Methods:

Operando electrochemical phase engineering (ECPE) was employed.
A perovskite cathode (Sr₂Fe₁.₅Mo₀.₅O₆‒δ) in solid oxide electrolysis cells was investigated.
Operando X-ray diffraction and electron microscopy were used to analyze structural evolution.

Main Results:

Cathodic polarization induced reversible phase transitions, regenerating active sites within minutes.
The dynamic phase switching redistributed exsolved Fe nanoparticles and segregated inactive phases.
The engineered cathode sustained efficient CO₂ electroreduction for over 2100 hours with high Faradaic efficiency.

Conclusions:

ECPE effectively breaks the activity-stability trade-off in electrocatalysts.
This strategy offers a promising framework for durable and efficient electrochemical energy conversion.
The dynamic regeneration mechanism provides insights into designing next-generation electrocatalysts.