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B-Site Cation Ordered Double Perovskites as Efficient and Stable Electrocatalysts for Oxygen Evolution Reaction
Hainan Sun1, Gao Chen1, Yinlong Zhu1
1Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No.5 Xin Mofan Road, Nanjing, 210009, P. R. China.
New B-site cation-ordered double perovskites show superior performance as electrocatalysts for the oxygen evolution reaction (OER). These materials exhibit ultrahigh activity and stability, paving the way for advanced energy storage and conversion systems.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Perovskite oxides are crucial electrocatalysts for the oxygen evolution reaction (OER).
- Applications include water splitting, fuel cells, and metal-air batteries.
- Simple disordered perovskites are widely studied, but ordered structures offer potential advantages.
Purpose of the Study:
- To investigate B-site cation-ordered double perovskites (Ba₂ Biₓ Sc₀.₂ Co₁.₈₋ₓ O₆₋δ) as novel electrocatalysts for OER.
- To evaluate their catalytic activity and stability in alkaline media.
- To understand the role of ordered cobalt environments in enhancing OER performance.
Main Methods:
- Synthesis of Ba₂ Biₓ Sc₀.₂ Co₁.₈₋ₓ O₆₋δ perovskite oxides.
- Electrochemical characterization using cyclic voltammetry and chronopotentiometry.
- Analysis of cobalt local environments and their correlation with catalytic activity.
Main Results:
- The ordered double perovskites demonstrated superior electrocatalytic activity for OER in alkaline solution.
- Ultrahigh catalytic activity was observed.
- The Ba₂ Bi₀.₁ Sc₀.₂ Co₁.₇ O₆₋δ sample showed no significant performance degradation after prolonged testing.
- The ordered [Co²⁺] and [Sc³⁺, Bi⁵⁺, Co³⁺] dual environments were identified as critical for improved OER activity.
Conclusions:
- B-site cation-ordered double perovskite oxides represent a new class of highly active and stable electrocatalysts for OER.
- These materials hold significant promise for applications in sustainable energy storage and conversion.
- The ordered cation arrangement and dual cobalt environments are key factors for enhanced catalytic performance.
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