期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 26, 期 49, 页码 11231-11240出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202000795
关键词
MXenes; nanoparticles; precursor-guided synthesis; SnS; sodium-ion batteries
资金
- National Natural Science Foundation of China [21872008, 21601014]
The optimization of three-dimensional (3D) MXene-based electrodes with desired electrochemical performances is highly demanded. Here, a precursor-guided strategy is reported for fabricating the 3D SnS/MXene architecture with tiny SnS nanocrystals (approximate to 5 nm in size) covalently decorated on the wrinkled Ti(3)C(2)T(x)nanosheets through Ti-S bonds (denoted as SnS/Ti3C2Tx-O). The formation of Ti-S bonds between SnS and Ti(3)C(2)T(x)was confirmed by extended X-ray absorption fine structure (EXAFS). Rather than bulky SnS plates decorated on Ti3C2Tx(SnS/Ti3C2Tx-H) by one-step hydrothermal sulfidation followed by post annealing, this SnS/Ti3C2Tx-O presents size-dependent structural and dynamic properties. The as-formed 3D hierarchical structure can provide short ion-diffusion pathways and electron transport distances because of the more accessible surface sites. In addition, benefiting from the tiny SnS nanocrystals that can effectively improve Na(+)diffusion and suppress structural variation upon charge/discharge processes, the as-obtained SnS/Ti3C2Tx-O can generate pseudocapacitance-dominated storage behavior enabled by engineered surface reactions. As predicted, this electrode exhibits an enhanced Na storage capacity of 565 mAh g(-1)at 0.1 A g(-1)after 75 cycles, outperforming SnS/Ti3C2Tx-H (336 mAh g(-1)), SnS (212 mAh g(-1)), and Ti3C2Tx(104 mAh g(-1)) electrodes.
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