N/O/P-rich three-dimensional carbon network for fast sodium storage
| Autor: | Mengwei Lu, Panbo Liu, Zhuoyue Meng, Zhipeng Xu, Tiehu Li, Chen Chen, Ying Huang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Sodium Doping Heteroatom chemistry.chemical_element 02 engineering and technology General Chemistry Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences law.invention Chemical engineering chemistry law General Materials Science Calcination Graphite 0210 nano-technology Carbon |
| Zdroj: | Carbon. 170:225-235 |
| ISSN: | 0008-6223 |
| DOI: | 10.1016/j.carbon.2020.08.042 |
| Popis: | Heteroatom doping is an effective strategy to improve the sodium storage capacity of carbon materials. However, the current heteroatom doping preparation method is complicated and it is difficult to achieve large-scale industrial production. In this paper, starch is used as precursor to obtain N, O, P co-doped carbon network (NOP–CN) through a simple calcination. Experimental and theoretical calculations were used to systematically analyze the effect of N, O, P co-doping on the sodium storage capacity of the carbon material. Compared with diatomic (N, O) doping, the introduction of P atoms further enhances the conductivity of the carbon structure, while distorting the graphite layer, generating more active sites and defects, increasing the graphite layer spacing. At the same time, the unique three-dimensional network of NOP–CN provides a fast transmission channel for sodium ions. Therefore, NOP–CN exhibits excellent electrochemical performance. The reversible capacity can reach 341.3 mA h g−1 at 0.05 A g−1. After 2000 cycles at 5 A g−1, the capacity can remain 119.1 mA h g−1. The excellent sodium storage capacity and simple synthesis strategy in this study provide an efficient and convenient method for the design of heteroatom-doped carbon materials. |
| Databáze: | OpenAIRE |
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