利用火焰法一步原位生成附着在泡沫镍上Co3O4修饰的碳纳米管(Co3O4/CNT/NF).该方法仅需数十秒的反应时间,大大减少了制备时间.所得复合材料中泡沫镍骨架为导电基底,互相搭接、连接的碳纳米管无需黏接剂辅助附着于泡沫镍骨架的表面,形成良好的导电通道和巨大的比表面积.活性纳米颗粒Co3O4均匀地分散在碳纳米管中.作为电催化电极,这种结构既保证良好的电子电导率,又暴露出催化剂材料大量的活性位点,促进其电催化性能的提升.结果显示,该电极材料双电层电容为34.1 mF cm-2,析氧反应(OER)中的过电位为288 mV@10 mA cm-2和372 mV@100 mA cm-2,优于商用RuO2催化剂.在全水解过程中,仅需要1.722 V的电位就可以达到10 mA cm-2.
Thermal Preparation Method and Electrocatalytic Performance Study of Co3O4/CNT Composite
Co3O4-modified carbon nanotubes attached on nickel foam(Co3O4/CNT/NF)were prepared via flame method.This process only takes tens of seconds,reducing the synthesis time greatly.In the resulting composite,skeletons of nickel foam were used as the conductive substrate,and the interlocking and connected carbon nanotubes(CNTs)attached on the surface of the nickel foam forms good conductive channels and a huge specific surface area.The reactive nanoparticles Co3O4 are uniformly dispersed in the CNTs.As an electrocatalytic electrode,this structure both ensures good electronic conductivity and exposes a large number of active sites of the catalyst material,promoting its electrocatalytic performance.The results show that the bilayer capacitance of this electrode material is 34.1 mF cm-2,and the overpotentials in oxygen evolution reaction(OER)are288 mV@10 mA cm-2 and 372 mV@100 mA cm-2,respectively,which are superior than those of commercial RuO2 catalysts.A potential of only 1.722 V is required to reach 10 mA cm-2 during full hydrolysis.
flame methodbifunctional catalystcarbon nanotubescobalt trioxideelectrolytic water
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