Fabrication And Microstructure Of Carbon Nanotube On Stainless Steel And Its Electrochemical Applications

Carbon nanotubes(CNTs)have attracted much attention in the field of electrochemical energy storage devices and electrochemical sensors due to its excellent mechanical and electrical performance.At present,CNTs are synthesised via chemical vapor deposition(CVD)using iron series elements nanoparticles spitted on the substrate as catalyst.However,the fabrication and distribution of the nano-sized catalysts were difficult to control and easy to reunite,which complicated the progress of the preparation of CNTs.The stainless steel contains lots of Fe and Ni which can be used as a substrate to fabricate the CNTs directly.Whereas,the CNTs grown on stainless steel showed poor electrochemical performance which limited its actual applications.Herein,the CNTs were prepared on 316 L stainless steel,then annealed in air atmosphere to expose much more edge flat structure for promoting the electrochemical activity.Furthermore,the materials were studied in super capacitor and electrochemical sensor.The main results were as follows:1.The acetylene was as carbon source,the CNTs were fabricated on the surface of316 L stainless steel by the chemical vaporization deposition.And the diameter was about 120 nm.Then the materials were conducted at different temperature(450?,500?,and 550?)for 120 min in the air.Subsequently,they were packaged electrodes to gauge the capacitive property.The results showed that with the increasing of thermal energy temperature,the materials were ablated and exposed more edge plane,and the response current were improved.It were converted super hydrophilic state from the hydrophobic and had more hybrid structure on the surface.Which promoted the electrolyte ion intimate contact with materials and electron transfer rate was accelerated.Under the condition of 500?,specific capacitance of the material was about twice as the pristine material.And it is concluded that the optimal heat treatment temperature is 500?.2.Under 500?,the CNTs on the 316 L stainless steel suffered the different heatpreservation time(60min,120 min,180min),then detected UA in the large amount of AA.The study displayed that with the increasing of holding time,the ablation degree of the materials were deepened,but the disorder of CNTs changed small.After the electrochemical sensor test,the original specimen and the samples which suffered450? and 550? thermal engineering could not clearly distinguish the UA,AA response peaks.The materials of 500? treatment poscessed obvious potential peaks and wider potential difference.Among them,the material of 500?,120 min treatment detected the best,the linearity was about 0.990.Relative to the thermal engineering temperature,the holding time has weak effects on electrochemical activity of CNTs.