Journal
NANO ENERGY
Volume 77, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105189
Keywords
Sodium storage; Sulfur vacancy; Interlayer defect; Carbonized bacterial cellulose; ReS2
Categories
Funding
- National Natural Science Foundation of China [51433001, 21674019, 21604010]
- Science and Technology Commission of Shanghai Municipality [16520722100]
- Program of Shanghai Academic Research Leader [17XD1400100]
- Shanghai Scientific and Technological Innovation Project [18JC1410600]
- Chenguang Program - Shanghai Education Development Foundation
- Shanghai Municipal Education Commission [16CG39]
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The sodium-ion storage property in two-dimensional transition metal dichalcogenides (TMDs) is still seriously confined due to the lacking of efficient pathways for Na+ insertion, which enlightens the construction of multidimensional ion channels a necessary. Herein, we prepared interlayer defect, sulfur vacancy-contained ReS2 nanosheets on porous nitrogen-doped carbonized bacterial cellulose (dr-ReS2-x/NCBC). In such dual-defect configuration, the interlayer defects provide interconnected in-plane/interlamination channels for offering extra pathways of Na+ insertion/extraction and shortening ionic diffusion distance, while the sulfur vacancy could further enhance the electronic conductivity and induce more active sites for Na+ storage. Therefore, the dr-ReS2-x/NCBC anode displays an enhanced rate capacity (231.2 mAh g(-1) at 5 A g(-1)) and a good cycling stability (187.3 mAh g(-1) at 5 A g(-1) after 500 cycles). Furtherly revealed by density functional theory calculations, the sodium-ion storage property is attributed to its negatively shifted binding energy for sodium ions (from -0.771 to -1.791/-1.244 eV), and alleviated structural change (from 5.8% to 3.4%/-1.6%) during sodiation/desodiation processes. The dr-ReS2-x/NCBC anode was also assembled coupling with Na3V2(PO4)(3) cathode as a sodium-ion full cell for practical applications. This work is expected to offer an in-depth understanding between dual-defect engineering in TMDs-based anodes and as-enhanced sodium-storage performance.
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