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Enhanced capacitive deionization performance of graphene by nitrogen doping
Xingtao Xu1, Likun Pan1, Yong Liu1
1Engineering Research Center for Nanophotonics & Advanced Instrument, Ministry of Education, Department of Physics, East China Normal University, Shanghai 200062, China.
Journal of Colloid and Interface Science
|January 25, 2015
Summary
Nitrogen-doped graphene (NG) shows enhanced electrosorption capacity for removing contaminants from water. This novel material significantly outperforms pristine graphene (PG) in water purification applications.
Area of Science:
- Materials Science
- Electrochemistry
- Environmental Engineering
Background:
- Graphene oxide is a precursor for advanced carbon materials.
- Nitrogen doping can modify graphene's electrochemical properties.
- Electrosorption is a promising water treatment technology.
Purpose of the Study:
- To fabricate nitrogen-doped graphene (NG) via a facile method.
- To evaluate the electrosorption performance of NG for water purification.
- To compare NG with pristine graphene (PG).
Main Methods:
- Fabrication of NG through thermal treatment of graphene oxide in ammonia.
- Characterization using SEM, Raman, BET, XPS, CV, and EIS.
- Electrosorption experiments in NaCl solutions.
Main Results:
- NG exhibited a high specific surface area, increased specific capacitance, and low charge transfer resistance.
- NG achieved a high electrosorption capacity of 4.81 mg g⁻¹ at 100 μS cm⁻¹.
- NG demonstrated superior performance compared to PG (3.85 mg g⁻¹).
Conclusions:
- Nitrogen doping significantly enhances the electrosorption capacity of graphene.
- NG is a highly effective material for electrochemical water purification.
- The developed method offers a scalable approach for NG synthesis.
