| In this paper, highly ordered porous anodic alumina template was respectively prepared under40V and60V, in0.3M oxalic acid solution at4℃by two-step anodization. The morphology and structure of anodic alumina oxide were characterized by SEM and XRD. The rectification characteristic of anodic alumina membrane was studied under the different termination voltage. The result indicated that the growing of anodic alumina oxide membrane mainly has four steps:the generation of barrier layer, micro pore formation, the growth of the pore and the stability of pore. The average pore size is73.0nm and94.3nm respectively prepared under the anodic oxidation voltage of40V and60V. The ordered degree of AAO (40V) is better than that of AAO (60V). The structure of ordered porous anodic alumina template prepared in oxalic acid solution is amorphous state. Al/AAO has PN junction characteristic, which shows the best rectification characterisitic under the15V termination voltage.Ni nano wires were fabricated by AC deposition respectively using different AAO. Ni nano electrode was prepared after peeling AAO and electroless nickel plating process. The morphology and structure of Ni nanowire assembly system and active Ni nano electrode were characterized by SEM, EDX and XRD. The result showed that the rectification characterisitic of AAO can affect nickel electroplating quantity. The rectification characterisitic of AAO (40V) is better than that of AAO (60V). This experiment for electroless nickel plating mechanism conforms to the atomic hydrogen theory, in the chemical nickel plating process the reducing agent is active hydrogen from phosphinate. The surface area of active Ni electrode has increased due to the nano nanostructures.The structure of Ni nano electrode and Ni bulk electrode was characterized by XRD. The electrochemical performance and hydrogen evolution reaction of two kinds of electrode were studied by circle current-voltage, polarization curves and AC impedance in seawater. The influence of the scanning speed and concentration of KOH on active Ni nano electrode was studied by circle current-voltage. The electrochemical catalytic performance to ethanol of the active Ni nano electrode was studied by circle current-voltage in mixture soulation of ethanol and KOH. Finally the effect of Ni nano electrode doped with Co on electrochemical performance of the Ni nano electrode on was studied by polarization curves in seawater.The resulst showed that the nano electrode had greater activity area, better catalytic activity and smaller resistance of hydrogen evolution reaction(HER). The active Ni nano electrode had the higher electro-catalytic activity for the HER and the overpotential was lowered by357mV at100mA/cm2compared with the Ni bulk electrodes. The electrochemical active of Ni nano electrode was proportional to the the scanning speed and concentration of KOH in circle current-voltage. The electrochemical active of Ni nano electrode is improved by Ni nano electrode doped with Co. |
