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Perspectives on an Advanced Hydrogen Storage System: Platinum-Carbon Nanotube Nanocomposite Materials

Published online by Cambridge University Press:  26 February 2011

Renju Zacharia ,
Sami-ullah Rather ,
Sang Woon Hwang ,
Arul Manuel Stephan  and
Kee Suk Nahm
Renju Zacharia
Affiliation:
[email protected], Chonbuk National University, Chemical Engineering, 561-756 Chonju, Chonju, 561-756, Korea, Republic of
Sami-ullah Rather
Affiliation:
[email protected], Chonbuk National University, Nanomaterials Research Center and School of Chemical Engineering and Technology, Chonju, 561-756, Korea, Republic of
Sang Woon Hwang
Affiliation:
[email protected], Chonbuk National University, Nanomaterials Research Center and School of Chemical Engineering and Technology, Chonju, 561-756, Korea, Republic of
Arul Manuel Stephan
Affiliation:
[email protected], Central Electrochemical Research Institute, Electrochemical Energy Systems Division, Chennai, 630 006, India
Kee Suk Nahm
Affiliation:
[email protected], Chonbuk National University, Nanomaterials Research Center and School of Chemical Engineering and Technology, Chonju, 561-756, Korea, Republic of
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Abstract

Transition-metal functionalized-carbon nanotubes (CNTs) represent an important genre of hydrogen storage systems that exhibit superior storage capacity and improved storage kinetics when compared with the pristine CNTs. Here, we compare the reversible gravimetric hydrogen storage capacity of platinum-functionalized CNTs with that of pristine tubes, both measured at 300 K and an equilibrium hydrogen pressure of 1.67 MPa. The maximum reversible hydrogen storage capacity exhibited by the nano-composite material is found to be 3.2 ± 0.1 wt%, which is a nearly 50 % enhancement when compared with that of the pristine tubes. The enhanced hydrogen storage capacity of functionalized CNTs is attributed to the spill-over phenomena as suggested by the estimated storage capacity of Pt phase. The hydrogen storage in Pt nanoparticles modeled using the atomic magic number calculation and Pt hydride stoichiometry of PtH4 also suggests that nearly 15 closed shells of Pt atoms reversibly adsorb and spill hydrogen on to CNT binding sites.

Keywords

nanostructurehydrogenationadsorption
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 973: Symposium BB – Mobile Energy , 2006 , 0973-BB03-01
Copyright
Copyright © Materials Research Society 2007

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