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Ultra-Stable Potassium Ion Storage of Nitrogen-Doped Carbon Nanofiber Derived from Bacterial Cellulose
| Content Provider | MDPI |
|---|---|
| Author | Ma, Liang Li, Jinliang Li, Zhibin Ji, Yingying Mai, Wenjie Wang, Hao |
| Copyright Year | 2021 |
| Description | As a promising energy storage system, potassium (K) ion batteries (KIBs) have received extensive attention due to the abundance of potassium resource in the Earth’s crust and the similar properties of K to Li. However, the electrode always presents poor stability for K-ion storage due to the large radius of K-ions. In our work, we develop a nitrogen-doped carbon nanofiber (N-CNF) derived from bacterial cellulose by a simple pyrolysis process, which allows ultra-stable K-ion storage. Even at a large current density of 1 A g−1, our electrode exhibits a reversible specific capacity of 81 mAh g−1 after 3000 cycles for KIBs, with a capacity retention ratio of 71%. To investigate the electrochemical enhancement performance of our N-CNF, we provide the calculation results according to density functional theory, demonstrating that nitrogen doping in carbon is in favor of the K-ion adsorption during the potassiation process. This behavior will contribute to the enhancement of electrochemical performance for KIBs. In addition, our electrode exhibits a low voltage plateau during the potassiation–depotassiation process. To further evaluate this performance, we calculate the “relative energy density” for comparison. The results illustrate that our electrode presents a high “relative energy density”, indicating that our N-CNF is a promising anode material for KIBs. |
| Starting Page | 1130 |
| e-ISSN | 20794991 |
| DOI | 10.3390/nano11051130 |
| Journal | Nanomaterials |
| Issue Number | 5 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-04-27 |
| Access Restriction | Open |
| Subject Keyword | Nanomaterials Paper and Wood Nitrogen Doping Carbon Nanofiber Bacterial Cellulose Relative Energy Density Potassium Ion Batteries |
| Content Type | Text |
| Resource Type | Article |
