Thermal effects on hydrogen storage capacity of Pd/MWCNT nanoparticles deposited at moderate pressure and temperature supercritical carbon dioxide conditions

ERÜNAL E., Ulusal F.

JOURNAL OF SUPERCRITICAL FLUIDS, vol.157, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 157
  • Publication Date: 2020
  • Doi Number: 10.1016/j.supflu.2019.104706
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, Food Science & Technology Abstracts, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: Hydrogen storage, Multi-walled carbon nanotubes, Thermal effect, Supercritical carbondioxide deposition, Temperature programmed reduction/desorption, PD NANOPARTICLES, PALLADIUM NANOPARTICLES, ALUMINA CATALYSTS, FLUID DEPOSITION, NANOTUBES, SBA-15, PERFORMANCE, SILICA, SOLUBILITY, ADSORPTION
  • Çukurova University Affiliated: Yes


Pd nanoparticles were deposited on MWCNT support for the first time at 80 and under 2500 psi scCO(2) conditions via a bipyridyl precursor in the absence co-solvent. After deposition, the samples were heated under different atmospheres. Then their morphological and hydrogen uptake capacities were investigated. An average particle size between 7-9 nm was estimated via HR-TEM images while intense Pd(111) and Pd(200) sites were detected for all heated samples except no thermally treated one which exhibits PdHx sites. The highest hydrogen adsorption at room temperature was recorded for the samples heated under oxygen. At room temperature, Pd loading amount was found to be effective in means of captured hydrogen. Hence, at higher temperatures, hydrogen uptake of samples treated under nitrogen atmosphere was higher. Additionally, in case of the sample which was not thermally treated, a signal referring to hydrogen release between 200-300 degrees C during reduction was detected. (C) 2019 Elsevier B.V. All rights reserved.