Hydrogen-enriched porous carbon nanosheets with high sodium storage capacity
- Hydrogen-enriched porous carbon nanosheets with high sodium storage capacity
- 윤도현; 김동현; 정경윤; 장원영; 김승민; 김재훈
- carbon nanosheet; sodium ion batteries
- Issue Date
- VOL 98, 213-220
- A simple supercritical alcohol route was developed to fabricate hydrogen-enriched porous carbon nanosheets (H-PCNs). The as-prepared H-PCNs were tested as an anode active material for sodium ion batteries. Due to the unique hydrogen donation and alkoxylation ability associated with supercritical isopropanol, the hydrogen-to-carbon ratio of H-PCNs was as high as 2.3. The H-PCNs electrode exhibit an excellent reversible capacity of 300 mAh g−1 at 50 mA g−1 and remarkable cycling stability up to 2000 cycles at 1–5 A g−1. A high rate-performance of 74 mAh g−1 was also obtained at the high current density of 5 A g−1. The excellent electrochemical performance of H-PCNs for Na ion uptake is attributed to the high hydrogen-terminated groups and large amount of defects on the carbon sheets. In addition, the large interlayer spacing (0.38 nm), high specific surface area (147 m2 g−1) and high porosity (58%) would also contribute to the high Na ion uptake.
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