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Decoupling the air sensitivity of Na-layered oxides
Yang Yang1,2, Zaifa Wang3, Congcong Du3
1Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Science (New York, N.Y.)
|August 15, 2024
Summary
Air sensitivity of sodium (Na)-layered oxides (NLOs) is a major hurdle. Water vapor, combined with CO2 or O2, triggers NLO degradation, but strategies exist to enhance stability.
Area of Science:
- Materials Science
- Electrochemistry
- Chemical Engineering
Background:
- Air sensitivity of sodium (Na)-layered oxides (NLOs) impedes their commercialization.
- The complex interactions of air components with NLOs' bulk and surfaces have long puzzled researchers.
- Understanding these degradation pathways is crucial for developing stable NLO materials.
Purpose of the Study:
- To elucidate the mechanisms behind the air-induced degradation of NLOs.
- To identify key factors influencing NLO stability in ambient conditions.
- To provide rational design principles for air-stable NLOs.
Main Methods:
- Investigated the synergistic effects of water vapor with carbon dioxide and oxygen on NLOs.
- Quantified the cation competition coefficient (η) and its relation to acid attack resistance.
- Analyzed the role of particle size and redox couples in NLO degradation.
- Utilized advanced analytical techniques to probe degradation mechanisms at the molecular level.
Main Results:
- Water vapor initiates acid degradation of NLOs when coupled with CO2.
- Water vapor drives oxidative degradation of NLOs when combined with O2.
- Reducing the cation competition coefficient (η) and increasing particle size enhance acid resistance.
- Employing high-potential redox couples effectively prevents oxidative degradation.
Conclusions:
- The study clarifies the specific roles of water vapor, CO2, and O2 in NLO air deterioration.
- Strategies for enhancing NLO stability include tuning the cation competition coefficient, particle size, and redox couples.
- These findings pave the way for designing robust and commercially viable air-stable NLOs for energy storage applications.
