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首页> 外文期刊>Journal of Colloid and Interface Science >Tin oxide (SnO_2) nanoparticles/electrospun carbon nanofibers (CNFs) heterostructures: Controlled fabrication and high capacitive behavior
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Tin oxide (SnO_2) nanoparticles/electrospun carbon nanofibers (CNFs) heterostructures: Controlled fabrication and high capacitive behavior

机译：氧化锡（SnO_2）纳米粒子/电纺碳纳米纤维（CNFs）异质结构：受控的制造和高电容性能

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摘要

Tin oxide (SnO_2)/carbon nanofibers (CNFs) heterostructures were fabricated by combining the versatility of the electrospinning technique and template-free solvent-thermal process. The results revealed that the SnO_2 nanostructures were successfully grown on the primary electrospun carbon nanofibers substrates. And, the coverage density of SnO_2 nanoparticles coating on the surface of the CNFs could be controlled by simply adjusting the mass ratio of CNFs to SnCl_4·5H_2O in the precursor during the solvent-thermal process for the fabrication of SnO_2/CNFs heterostructures. The electrochemical performances of the SnO_2/CNFs heterostructures as the electrode materials for supercapacitors were evaluated by cyclic voltammetry (CV) and galvanostatic charge-discharge measurement in 1M H_2SO_4 solution. At different scan rates, all the samples with different coverage densities of SnO_2 showed excellent capacitance behavior. And, the sample CS2 (the mass ratio of CNFs to SnCl_4·5H_2O reached 1:7) exhibited a maximum specific capacitance of 187F/g at a scan rate of 20mV/s. Moreover, after 1000 cycles, the specific capacitance retention of this sample was over 95%. The high capacitive behavior could be ascribed to the low resistance of SnO_2/CNFs heterostructures and rapid transport of the electrolyte ions from bulk solution to the surface of SnO_2.
机译：结合静电纺丝技术的多功能性和无模板溶剂热工艺，制备了氧化锡（SnO_2）/碳纳米纤维（CNFs）异质结构。结果表明，SnO_2纳米结构成功地生长在主要的电纺碳纳米纤维基底上。并且，可以通过在制备SnO_2 / CNFs异质结构的溶剂-热过程中简单地调节前驱体中CNF与SnCl_4·5H_2O的质量比来控制涂覆在CNF表面上的SnO_2纳米颗粒的覆盖密度。通过循环伏安法（CV）和恒电流充放电测量，在1M H_2SO_4溶液中评估了SnO_2 / CNFs异质结构作为超级电容器电极材料的电化学性能。在不同的扫描速率下，所有具有不同SnO_2覆盖密度的样品均表现出优异的电容性能。并且，样品CS2（CNF与SnCl_4·5H_2O的质量比达到1：7）在20mV / s的扫描速率下表现出最大比电容为187F / g。此外，在1000次循环后，该样品的比电容保持率超过95％。高电容行为可归因于SnO_2 / CNFs异质结构的低电阻和电解质离子从本体溶液到SnO_2表面的快速迁移。

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