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Rational Surface Tailoring Oxygen Functional Groups on Carbon Spheres for Capacitive Mechanistic Study.
Dongdong Zhang1,2, Jianlong Wang1,2, Chong He2
1Institute of Coal Chemistry , Chinese Academy of Sciences , 27 Taoyuan South Road , Taiyuan 030001 , China.
ACS Applied Materials & Interfaces
|March 20, 2019
Summary
Surface oxygen groups in porous carbons significantly enhance electric double-layer capacitor performance. Tailoring these groups improves pseudocapacitance and ion diffusion, boosting energy density and stability for supercapacitors.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Porous carbons are key electrode materials for electric double-layer capacitors.
- The role of electrochemically active surface oxygen groups in porous carbons remains understudied.
- Understanding these groups is crucial for optimizing capacitor performance.
Purpose of the Study:
- To investigate the impact of tailored surface oxygen groups on the capacitive mechanism of porous carbons.
- To correlate the degree and variety of oxygen groups with electrochemical properties.
- To enhance the performance of supercapacitors using modified porous carbons.
Main Methods:
- Nitric acid modification and hydrothermal oxidation to tailor oxygen groups on carbon spheres (N-CS).
- Preservation of micro-meso-macroporous structures during modification.
- Electrochemical characterization including cyclic voltammetry and galvanostatic charge-discharge in KOH and TEABF4 electrolytes.
Main Results:
- Optimized N-CS exhibited a 52.8% increase in capacitance (279.4 F g⁻¹ at 1 A g⁻¹) compared to pristine carbon spheres (182.8 F g⁻¹ at 1 A g⁻¹).
- Pseudocapacitance was attributed to both surface-controlled reactions and diffusion-controlled ion insertion/deinsertion.
- Supercapacitors demonstrated stable energy density (5 Wh kg⁻¹ in KOH, 26.9 Wh kg⁻¹ in TEABF4) and excellent cycling stability (93.2% retention after 10,000 cycles).
Conclusions:
- Surface oxygen groups significantly alter the capacitive mechanism and contribution of porous carbons.
- Tailored oxygen functionalization is an effective strategy to enhance supercapacitor performance.
- The study provides insights into optimizing porous carbon materials for advanced energy storage applications.
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