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Probing Dynamic Self-Reconstruction on Perovskite Fluorides toward Ultrafast Oxygen Evolution
Jing Zhang1, Yu Ye2, Zhenbin Wang3
1Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|July 22, 2022
Summary
Newly designed nickel-iron perovskite fluorides undergo self-reconstruction during the oxygen evolution reaction (OER). This process activates the electrocatalyst, significantly boosting energy conversion efficiency and durability.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Developing efficient electrocatalysts for the oxygen evolution reaction (OER) is crucial for energy conversion technologies.
- Perovskite fluorides are promising OER electrocatalysts, but their active sites under operational conditions remain unclear.
Purpose of the Study:
- To investigate the self-reconstruction mechanism of Ni-Fe coupled perovskite fluorides during OER.
- To understand how Fe incorporation influences the OER activity and stability of perovskite fluorides.
Main Methods:
- In situ Raman spectroscopy
- Ex situ X-ray absorption spectroscopy
- Theoretical calculations
- Electrochemical performance testing
Main Results:
- Fe incorporation in perovskite fluorides activates self-reconstruction during OER.
- Self-reconstruction lowers the energy barrier for OER, enhancing catalytic activity.
- The KNi0.8Fe0.2F3@nickel foam (KNFF2@NF) catalyst achieved an overpotential of 258 mV at 100 mA cm-2 with 100 h durability.
Conclusions:
- Self-reconstruction is a key mechanism for enhancing the performance of perovskite fluoride electrocatalysts for OER.
- Fe-incorporated perovskite fluorides offer a promising pathway for developing low-cost, highly active, and durable OER electrocatalysts.
