Loading...
Enhanced electrochemical hydrogen storage by catalytic Fe-doped multi-walled carbon nanotubes synthesized by thermal chemical vapor deposition
1134 viewed

Enhanced electrochemical hydrogen storage by catalytic Fe-doped multi-walled carbon nanotubes synthesized by thermal chemical vapor deposition

Reyhani, A

Enhanced electrochemical hydrogen storage by catalytic Fe-doped multi-walled carbon nanotubes synthesized by thermal chemical vapor deposition

Reyhani, A ; Sharif University of Technology | 2009

1134 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.jpowsour.2008.11.131
  3. Publisher: 2009
  4. Abstract:
  5. Hydrogen storage capacities of raw, oxidized, purified and Fe-doped multi-walled carbon nanotubes (MWCNTs) were studied by electrochemical method. Based on transmission electron microscopy and Raman spectroscopic data, thermal oxidation removed defective graphite shells at the outer walls of MWCNTs. The analysis results indicated that the acid treatment dissolved most of the catalysts and opened some tips of the MWCNTs. Thermal gravimetric analysis and differential scanning calorimetry results illustrated that by oxidation and purification of MWCNTs, the weight loss peak shifts toward a higher temperature. N2 adsorption isotherms of the purified and oxidized MWCNTs showed an increase in N2 adsorption below P/Po = 0.05, suggesting that microporous structures exist in the purified and oxidized MWCNTs. The electrochemical results revealed that the Fe-doped MWCNTs produced the highest hydrogen storage capacities compared to the other samples in various sweep rates. According to electrochemical analyses, the peak currents of hydrogen adsorption/desorption increased by increasing the catalyst's active surface. © 2008 Elsevier B.V. All rights reserved
  6. Keywords:
  7. Electrochemical ; Fe-doped MWCNTs ; Hydrogen storage ; TCVD ; Adsorption ; Adsorption isotherms ; Atmospheric temperature ; Catalysis ; Catalysts ; Differential scanning calorimetry ; Dissolution ; Graphite ; Gravimetric analysis ; Hydrogen ; Multiwalled carbon nanotubes (MWCN) ; Oxidation ; Purification ; Transmission electron microscopy ; Acid treatments ; Active surfaces ; Adsorption/desorption ; Analysis results ; Electro-chemical methods ; Electrochemical ; Electrochemical analysis ; Electrochemical hydrogen storages ; Graphite shells ; Higher temperatures ; Hydrogen storage capacities ; Micro-porous structures ; Multi-walled carbon nanotubes ; Peak currents ; Peak shifts ; Raman spectroscopic ; Sweep rates ; Thermal chemical vapor depositions ; Thermal gravimetric analysis ; Thermal oxidations ; Weight loss ; Carbon nanotubes
  8. Source: Journal of Power Sources ; Volume 188, Issue 2 , 2009 , Pages 404-410 ; 03787753 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0378775308023161