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Accelerated Surface Reconstruction through Regulating the Solid-Liquid Interface by Oxyanions in Perovskite
Ying Tang1, Chao Wu1,2, Qi Zhang3
1College of Materials Science and Engineering, Sichuan University, 610065, Chengdu, China.
Angewandte Chemie (International Ed. in English)
|July 20, 2023
Summary
Adding oxyanions to electrolytes accelerates surface reconstruction in lattice oxygen oxidation mechanism (LOM) electrocatalysts. This breakthrough enhances oxygen evolution reaction (OER) performance by regulating the solid-liquid interface.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Surface reconstruction is crucial for high-performance lattice oxygen oxidation mechanism (LOM) perovskite electrocatalysts.
- Oxygen vacancy formation energy was traditionally considered the main factor influencing surface reconstruction.
- Previous research focused on optimizing composition to lower oxygen vacancy formation energy.
Purpose of the Study:
- To investigate the effect of oxyanions on the surface reconstruction of LOM-based perovskite electrocatalysts.
- To explore a novel method for enhancing oxygen evolution reaction (OER) activities.
- To elucidate the mechanism by which oxyanions influence surface reconstruction.
Main Methods:
- Electrochemical characterization of perovskite electrocatalysts.
- Addition of sulfate, carbonate, and nitrate oxyanions to the electrolyte.
- Analysis of solid-liquid interface dynamics and ion exchange.
Main Results:
- Oxyanion addition significantly accelerated surface reconstruction.
- Enhanced oxygen evolution reaction (OER) activities were observed with oxyanion-modified electrolytes.
- Oxyanions were found to adsorb at the solid-liquid interface, disrupting equilibrium and facilitating OH- release.
Conclusions:
- Oxyanions effectively regulate the solid-liquid interface to accelerate surface reconstruction in LOM electrocatalysts.
- This finding offers a new perspective on controlling surface reconstruction beyond oxygen vacancy formation energy.
- The study provides a novel strategy for enhancing OER performance in perovskite electrocatalysts.
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