Study on Hydrogen Adsorption on Multi-Walled Carbon Nanotubes by Electrochemical Method

Multi-walled carbon nanotubes (MWCNTs) with the diameter distribution in the range of 50-100 nm and various lengths were synthesized using TCVD method. The present research tries to study their electrochemical hydrogen storage of the MWCNTs. Our findings show that the desorption process of hydrogen is composed of two steps with the voltages of about 0.75 and 0.15 V. The adsorption of hydrogen in the 0.15 V forms at the temperatures higher than 30oC, and the amount of energy necessary to desorb hydrogen is 1.68 eV. The hydrogen storage capacity increases with the increasing of electrolyte temperature from 30 to 60 oC for both types of the adsorptions. These results also show that with the increasing of temperature up to 70 oC, hydrogen storage capacity at the 0.75 V considerably decreases but hydrogen storage capacity at the 0.15 V remains constant.

کلیدواژه ها:

Multi-Walled Carbon Nanotubes ، Hydrogen adsorption ، Electrochemical Method