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Title: High-surface-area nitrogen-doped reduced graphene oxide for electric double-layer capacitors

A two-step method consisting of solid-state microwave irradiation and heat treatment under NH₃ gas was used to prepare nitrogen-doped reduced graphene oxide (N-RGO) with a high specific surface area (1007m²g⁻¹), high electrical conductivity (1532S m⁻¹), and low oxygen content (1.5 wt%) for electric double-layer capacitor applications. The specific capacitance of N-RGO was 291 Fg⁻¹ at a current density of 1 A g⁻¹, and a capacitance of 261 F g⁻¹ was retained at 50 A g⁻¹, indicating a very good rate capability. N-RGO also showed excellent cycling stability, preserving 96% of the initial specific capacitance after 100,000 cycles. Near-edge X-ray absorption fine-structure spectroscopy evidenced the recover of π-conjugation in the carbon networks with the removal of oxygenated groups and revealed the chemical bonding of the nitrogen atoms in N-RGO. The good electrochemical performance of N-RGO is attributed to its high surface area, high electrical conductivity, and low oxygen content.
 [1] ;  [2] ;  [1] ;  [3] ;  [3] ;  [1] ;  [2] ;  [4] ;  [1]
  1. Yonsei Univ., Seoul (Republic of Korea)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  4. Korea Inst. of Ceramic Engineering and Technology, Seoul (Republic of Korea)
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Additional Journal Information:
Journal Volume: 8; Journal Issue: 11; Journal ID: ISSN 1864-5631
ChemPubSoc Europe
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
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Country of Publication:
United States
25 ENERGY STORAGE; national synchrotron light source