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>Cobalt sulfide nanoparticles decorated on TiO2 nanotubes via thermal vapor sulfurization of conformal TiO2-coated Co(CO3)(0.5)(OH)center dot 0.11H(2)O core-shell nanowires for energy storage applications
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Cobalt sulfide nanoparticles decorated on TiO2 nanotubes via thermal vapor sulfurization of conformal TiO2-coated Co(CO3)(0.5)(OH)center dot 0.11H(2)O core-shell nanowires for energy storage applications
Core-shell nanowires, consisting of Co(CO3)(0.5)(OH)center dot 0.11H(2)O cores (similar to 80 nm in diameter and similar to 2 mm in length) and TiO2 shells (similar to 20 nm in thickness), have been fabricated on various substrates via hydrothermal synthesis of the crystalline nanowire cores at 90 degrees C followed by atomic layer deposition (ALD) of the conformal amorphous shells at 25 degrees C. Post-growth thermal vapor sulfurization of such Co(CO3)(0.5)(OH)center dot 0.11H(2)O-TiO2 core-shell nanowires results in hybrid nanostructures of nanotubes decorated by nanoparticles. A combination of X-ray diffraction, transmission electron microscopy, and energy-dispersive X-ray spectroscopy revealed that the nanotubes are anatase crystalline TiO2 while the nanoparticles decorated on the walls of the nanotubes are dominated by Co3S4 crystallites. The hybrid nanostructures have been electrochemically characterized in a 2 M KOH electrolyte, they exhibit a specific capacitance of 650 F g(-1) at a scan rate of 10 mV s(-1). However, the sulfurized TiO2 nanotubes, from which the nanowire cores were etched away in a dilute HCl (0.2 M) solution before the sulfurization, do not exhibit any apparent pseudocapacitance behaviors. They are more likely supporting templates in the hybrid nanostructures. These properties of the obtained hybrid nanostructures indicate that the cobalt sulfide nanoparticles decorated on TiO2 nanotubes fabricated by thermal vapor sulfurization can be promising electrodes for energy storage applications.
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机译：核-壳纳米线，由Co（CO3）（0.5）（OH）中心点0.11H（2）O核（直径约80 nm，长度约2 mm）和TiO2壳（纳米管约20 nm）组成通过在90摄氏度下水热合成结晶纳米线核，然后在25摄氏度下保形无定形壳的原子层沉积（ALD），在各种基板上制造了这种厚度的Co.（CO3 （0.5）（OH）中心点0.11H（2）O-TiO2核-壳纳米线导致纳米颗粒修饰的纳米管的杂化纳米结构。 X射线衍射，透射电子显微镜和能量色散X射线光谱学的结合显示，纳米管是锐钛矿型TiO2，而装饰在纳米管壁上的纳米颗粒则以Co3S4晶体为主。杂化纳米结构已在2 M KOH电解质中进行了电化学表征，在10 mV s（-1）的扫描速率下显示出650 F g（-1）的比电容。但是，硫化后的TiO2纳米管在稀释的HCl（0.2 M）溶液中被蚀刻掉了，纳米线芯并未表现出任何明显的假电容行为。它们更有可能在杂化纳米结构中支持模板。所获得的杂化纳米结构的这些特性表明，通过热气相硫化在TiO2纳米管上装饰的硫化钴纳米颗粒可以成为有前景的储能电极。
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