Perovskites are widely utilized either as a primary component or as a substrate in which the dynamics of charged oxygen vacancy defects play an important role. Current knowledge regarding the dynamics of vacancy mobility in perovskites is solely based upon volume- and/or time-averaged measurements. This impedes our understanding of the basic physical principles governing defect migration in inorganic materials. Here, we measure the ergodic and nonergodic dynamics of vacancy migration at the relevant spatial and temporal scales using time-resolved atomic force microscopy techniques. Our findings demonstrate that the time constant associated with oxygen vacancy migration is a local property and can change drastically on short length and time scales, such that nonergodic states lead to a dramatic increase in the migration barrier. This correlated spatial and temporal variation in oxygen vacancy dynamics can extend hundreds of nanometers across the surface in inorganic perovskites.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/acs.nanolett.0c03002 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Strategically Engineered Metal Cluster-Rare Earth Oxide Heterojunction Catalyst for High-Performance Lean Electrolyte Lithium-Sulfur Batteries.
ACS Appl Mater Interfaces
January 2025
Key Laboratory of Carbon Materials of Zhejiang Province, Wenzhou University, Wenzhou 325035, China.
Developing high-energy-density lithium-sulfur batteries faces serious polysulfide shuttle effects and sluggish conversion kinetics, often necessitating the excessive use of electrolytes, which in turn adversely affects battery performance. Our study introduces a meticulously designed electrocatalyst, Cu-CeO@N/C, to enhance lean-electrolyte lithium-sulfur battery performance. This catalyst, featuring in situ synthesized Cu clusters, regulates oxygen vacancies in CeO and forms Cu-CeO heterojunctions, thereby diminishing sulfur conversion barriers and hastening reaction kinetics through the generation of S/S intermediates.
View Article and Find Full Text PDFGraphene Supported NiFe-LDH and PbO Catalysts Prepared by Plasma Process for Oxygen Evolution Reaction.
Materials (Basel)
December 2024
State Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China.
The development of efficient catalysts for water electrolysis is crucial for advancing the low-carbon transition and addressing the energy crisis. This work involves the fabrication of graphene-based catalysts for the oxygen evolution reaction (OER) by integrating NiFe-LDH and PbO onto graphene using plasma treatment. The plasma process takes only 30 min.
View Article and Find Full Text PDFBinder-Less Molybdenum Doped CoO Based Integrated Electrodes Fabricated by Electric Discharge Corrosion for High-Efficiency Supercapacitors.
Materials (Basel)
December 2024
Department of Mechatronic Engineering, Guangdong Polytechnic Normal University, Guangzhou 510665, China.
Article Synopsis
- Cobalt oxide (CoO) is an attractive electrode material for supercapacitors due to its affordability, natural abundance, non-toxicity, and high capacitance.
- Researchers developed a binder-less molybdenum doped CoO (Mo@CoO) integrated electrode using a simple electric discharge corrosion (EDC) method, which allows for direct synthesis without templates or additives.
- The study found that the Mo@CoO based supercapacitor with a specific discharge pulse width achieved a significantly higher capacitance and quick charge/discharge capabilities, showcasing the EDC method's potential for fabricating efficient electrodes for energy storage and sensing applications.
Significantly Enhanced Acidic Oxygen Evolution Reaction Performance of RuO Nanoparticles by Introducing Oxygen Vacancy with Polytetrafluoroethylene.
Polymers (Basel)
December 2024
Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education/Shandong Province, State Key Laboratory of Biobased Material and Green Papermaking, Faculty of Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China.
The supported RuO catalysts are known for their synergistic and interfacial effects, which significantly enhance both catalytic activity and stability. However, polymer-supported RuO catalysts have received limited attention due to challenges associated with poor conductivity. In this study, we successfully synthesized the RuO-polytetrafluoroethylene (PTFE) catalyst via a facile annealing process.
View Article and Find Full Text PDFPt@ZnCoO Microspheres as Peroxidase Mimics: Enhanced Catalytic Activity and Application for L-Cysteine Detection.
Molecules
January 2025
Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation & Hunan Provincial Key Laboratory of Cytochemistry, School of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha 410114, China.
Compared to natural enzymes, the development of efficient artificial simulated enzymes, such as those based on bimetallic materials with high catalytic activity and good stability, is an important way until now. Herein, we employed ZnCoO microspheres as carriers to synthesize Pt-doped composites with different amounts using a one-pot method. The morphology and structure of the synthesized materials were characterized using XRD, SEM, BET, FT-IR, XPS, and Zeta potential techniques.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!