Organic compounds with high theoretical capacity, tunable redox potentials and rich structural chemistry are considered as promising electrode materials for sodium-ion batteries (SIBs). However, organic electrode materials suffer from low...
Polymeric Schiff bases with a low and tunable redox voltage are regarded as promising anode materials for sodium-ion batteries (SIBs). Herein, polymeric Schiff bases with benzene (PSB-1) and thiophene rings (PSB-2) were designed and prepared as electrode materials for SIBs. Compared with PSB-1, the introduction of thiophene rings to the polymeric Schiff base PSB-2 enhances electron delocalization, structural stability, and intrinsic conductivity, contributing to excellent electrochemical performance. After discharging/charging for 200 cycles at 50 mA g −1 , a high specific charge capacity of 174.7 mAh g −1 is maintained for the PSB-2 electrode, much higher than that of PSB-1 (77.1 mAh g −1 ). After incorporation with multi-walled carbon nanotubes, a high reversible capacity of 290 mAh g −1 is achieved even after 450 cycles at 50 mA g −1 . Experimental results and theoretical calculations reveal that each repeat unit of PSB-2 can store four sodium ions via the imine bond C�N and sulfurs, of which the imine bond C�N functions as redox centers and the sulfur atoms mainly serve as electron reservoirs. This work demonstrates that the introduction of functional thiophene rings is efficient in improving the sodium-ion storage performance of polymeric Schiff bases.
Transparent, superhydrophobic, and colored silicone-carbon composite coatings were prepared by oxidative chemical vapor deposition (oCVD) of bulk silicone at ambient pressure. The colors, wettability, morphologies, and transparency of the coatings can be easily varied via changing both the concentration of gaseous oxygen and the deposition temperature. Typically, the black, brown, and yellow silicone-carbon composite coatings with different superhydrophobicity and transparency were achieved under oxygen-deficient atmospheres. Furthermore, the colored samples showed photoluminescence when they were excited by ultraviolet (UV) light, which is due to the fluorescence of carbons embedded inside the as-prepared coatings. In addition, more regular papillae and nanofibers with excellent superhydrophobicity were obtained at higher deposition temperatures. Our method was believed to develop a new strategy for fabricating multifunctional silicone-carbon composite coatings. V C 2014 Wiley Periodicals, Inc. J. Appl. Polym.Sci. 2014, 131, 40400.
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