Research On Preparation Of Electrodes Containing Multi-walled Carbon Nanotubes And Electrochemical Hydrogen Storage In It

Nickel-MWNT (with three different sizes in diameter) electrodes were prepared by two different procedures, powder briqutting and composite electrochemical deposition, respectively. The best technical conditions that electrodes were prepared by composite electrochemical deposition were acquired. The electrodes were based on the property of MWNT in electrochemical hydrogen storage. It is found that copper was not fit for conducting body concentrating current of the electrodes. The maximum discharge capacity of The hydrogen storage capacity in MWNT with 10-30nm, 60-100nm and less than 10nm in diameter was 318.9mA h/g , 550.6mA h/g and 1361.1mA h/g , responding to respective estimated as 1.12Wt%, 1.93Wt% and 4.77Wt%. The ransmission electron microscopy (TEM) results show that CNTs that were oxided are pure and some of tube wall are open end. The scanning electron microscopy (SEM) results show that CNTs in the electrodes prepared by composite electrochemical deposit method are embedded in the matrix uniformly and one side of which protrudes out of the surface. The Raman spectra results show that hydrogen may be stored in CNTs by chemisorption. The length, layers, size of inner diameter of MWNT greatly affect hydrogen storage in it. The prospect of MWNT's potential application for the negative electrode of rechargeable battery was also discussed.