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• W4214936775 abstract "Porous SiO2 mesoscale tubes (SiO2-pMT) impregnated with carbon in the pores within their tube walls were successfully prepared for the first time by making use of the Fe3+ assisted anchoring of dopamine (DA) on the surface of SiO2 as carbon source, and thereby endowed with highly enhanced anode performances for Li-ion batteries. Typically, a reversible specific capacity of 512.8 mAh g−1 was achieved after 500 cycles at 1 A g−1 when the SiO2-pMT impregnated with carbon by Fe3+ assistance was used as anode material, which is about 10 times that of SiO2-pMT with no carbon impregnation and 25% higher than that of the SiO2-pMT with carbon impregnated at double the concentration of dopamine but in the absence of Fe3+ cations. It has been found that the carbon impregnation of the SiO2-pMT may be achieved more easily and homogeneously with the assistance of Fe3+ cations and, as a result, 3-dimensional porous carbon-networks with higher connectivity can be built up, which greatly facilitate the transport of electrons to more potential reaction sites where Li-ions are available and provide fast channel for Li-ions diffusion, leading to enhanced electrochemical kinetics, as unveiled by the differential capacity curves and electrochemical impedance spectra acquired at different intervals during the initial cycle. Furthermore, as shown by XPS data, such benefitial assistance of Fe3+ cations is believed to arise from their coupling effects between the phenolic hydroxyl groups of dopamine molecules and the surface of SiO2 through the chemical bondings of C-O-Fe and Fe-O-Si." @default.
• W4214936775 created "2022-03-05" @default.
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• W4214936775 date "2022-03-01" @default.
• W4214936775 modified "2023-10-17" @default.
• W4214936775 title "Fe3+-assistantly carbon-impregnated porous SiO2 mesoscale tubes as Li-ion battery anode materials with highly enhanced performances" @default.
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• W4214936775 doi "https://doi.org/10.1016/j.ijhydene.2022.02.085" @default.
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