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Ce-MOF Derived Ceria: Insights into the Na-ion Storage Mechanism as a High-Rate Performance Anode Material
Summary:
The authors from Chung Yuan Christian University and National Cheng Kung University developed a Ce-MOF-derived CeOx/C nanocomposite with high-rate Na-ion storage performance, achieving 446 mAh g⁻¹ reversible capacity at 100 mA g⁻¹ and 256 mAh g⁻¹ over 600 cycles in sodium-ion batteries.
Background:
1. To address the low conductivity and poor cycling stability of metal oxide anodes in sodium-ion batteries, previous researchers explored MOF-derived materials, achieving improved performance, yet issues like structural degradation and limited rate capability remain.
2. The authors proposed an innovative calcination method to convert Ce-MOF-808 into CeOx/C, resulting in enhanced conductivity, pseudocapacitive behavior, and stable cycling.
Research Content:
1. Synthesis:
The authors synthesized CeOx/C via direct calcination of Ce-MOF-808 under argon flow at 800°C, forming carbon-encapsulated ceria nanocomposites.
2. Characterizations:
1) BET surface area decreased from 1420 m²/g (Ce-MOF) to 60 m²/g (CeOx/C), with preserved macroporosity.
2) SEM/TEM showed nanocube morphology (~30–100 nm) composed of 5 nm grains.
3) XRD confirmed cubic CeO₂; XPS revealed mixed Ce³⁺/Ce⁴⁺ states; Raman verified carbon presence (D/G ratio ~1.07).
3. Application:
The material was tested as a sodium-ion battery anode, delivering 446 mAh g⁻¹ at 100 mA g⁻¹, 208 mAh g⁻¹ at 2500 mA g⁻¹, and 250 mAh g⁻¹ after 600 cycles.
4. Mechanism:
Ex-situ XRD/XPS revealed a reversible conversion between CeO₂ and Ce₂O₃ during sodiation/desodiation, supported by pseudocapacitive charge storage (up to 81% capacitive contribution).
Outlook:
This work demonstrates a facile MOF-derived strategy to engineer high-performance ceria-based anodes for sodium-ion batteries, offering insights into oxygen-vacancy-mediated conversion mechanisms and paving the way for scalable energy storage materials.
Ce-MOF Derived Ceria: Insights into the Na-ion Storage Mechanism as a High-Rate Performance Anode Material
Authors: Rasu Muruganantham, Yu-Juan Gu, Yi-Da Song, Chung-Wei Kung, Wei-Ren Liu
DOI: 10.1016/j.apmt.2021.100935
Link: https://www.sciencedirect.com/science/article/pii/S2352940721000019
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