Fabrication And Application Of Nanorod Electrodes On Si Substrate

New energy systems which is more energy saving and environmentally friendly are attracting more and more concern because of the energy crisis and environmental pollution in the whole world.In all the systems,DMFC and supercapacitors have attracted the most concern.However,the cost and the life of DMFC and supereapacitors are restricted by the structure and the materials of the electrodes.In this work,new electrode architecture with nanorod structure is proposed.And the electrochemical performance of the electrodes is studied when they act as the electrodes of DMFC and supercapacitors.The main results are as follows:1.Al/Ti/Si substrates were fabricated by radio frequency sputtering.Then the ordered AAO templates were successfully transfered to silicon substrates by a two-step electrochemical anodization.AAO/Ti/Si substrates with different diameters were obtained by optimizing the experimental conditions.Compared with the single AAO templates,the AAO/Ti/Si substrates have the properties of good mechanical strength and durability against heat treatment at higher temperature.In addition,the AAO/Ti/Si substrates have also unique electrodeposition properties and could bond well with the deposited materials.2.Pt and PtRu nanorod electrodes were fabricated on the Si substrate direct current(DC) electrodeposition,respectively.The structure and the composition of the electrodes were characterized by SEM,TEM and EDS.The electrochemical characterization showed that Pt nanorod electrodes have sharper catalysis current than Pt film electrodes.And PtRu nanorod electrodes have better defending effect to the poison of carbonic oxide than Pt nanorod electrodes for the join of Ru element.3.PtNi nanorod electrodes were fabricated on the Si substrate to reduce the cost. The structure and the composition of the electrodes were characterized by SEM,TEM and EDS.The result of the electrochemical characterization showed that PtNi nanorod electrodes have larger active area than Pt/C electrodes which were fabricated with traditional method.Cyclic voltammograms and chronoamperograms showed that PtNi nanorod electrodes have better defending effect to the poison of carbonic oxide than Pt/C electrodes.4.PANI and CMO nanorod electrodes were fabricated on the Si substrate(DC) electrodeposition,respectively.The discharge capacitance of the PANI nanowire arrayed electrode at a current density of 5 Ag^-1 is 1142 Fg^-1,and the discharge capacitance loss after 500 consecutive cycles was negligible,at about 5%.The ideal capacitive behavior was obtained from the as-prepared sample heat-treated at 100℃. The specific capacitance of the electrode was 396 Fg^-1.