Second International Hydrogen Technology Congress, Adana, Türkiye, 15 - 18 Mart 2017, ss.1-6
The crucial role of hydrogen storage in energy technologies has recently increased the interest in Carbon Nanotubes which are known to be promising materials with their hydrogen storing capacities with respect to their high surface-to-volume ratios, high stabilities, and light weights. However, their hydrogen storage capacities still should be improved for moderate pressure and ambient temperature applications. One of the most common strategies to enhance hydrogen storage capacity of carbon nanotubes is using them with transition metals. In this work, Pd doped Multi-Walled Carbon Nanotubes were prepared via supercritical carbondioxide deposition method in order to obtain a well dispersed nanoparticle material. Temperature programmed desorption (TPD) and reduction (TPR) experiments were conducted. TPR measurements revealed an initial Pd hydride decomposition. Moreover, adsorption and desorption hysteresis at ambient temperature were also measured. The cumulative adsorption was found as 737 μmole/ g sample while TPD measurements showed that 656 μmole hydrogen storage capacities were a result of Pd doping on these materials. This shows that Pd doping enhanced hydrogen capacity of carbon nanotubes. Moreover, Pd doping affects the desorption ability of multiwall carbon nanotubes.