Kinetic and thermodynamic studies of hydrogen adsorption on titanate nanotubes decorated with a Prussian blue analogue
Kinetic and thermodynamic studies of hydrogen adsorption on titanate nanotubes decorated with a Prussian blue analogue
In this paper, the kinetic and thermodynamic hydrogen adsorption characteristics of a novel composite comprising TiNT decorated with the Prussian blue analogue Cd3FeIII are investigated at high pressures and different temperatures. It is shown that boundary-layer (film) diffusion does not play a limiting role in the mass transport of hydrogen inside the composite material. The diffusion coefficient and time constant at different temperatures and pressures are calculated using an intra-particle diffusion model. The results suggest that molecular diffusion dominates Knudsen diffusion in the composite material. There are clear improvements in the mass transport characteristics compared to bulk Cd3FeIII. The Gibb's free energy is estimated by fitting isotherm equilibrium data to the Dubinin–Astakhov model and is used to calculate the enthalpy and the entropy of adsorption. The calculated value of enthalpy is characteristic of a physisorption process and is considerably higher than the activation energy for intraparticle diffusion, suggesting that the rate-limiting step of hydrogen is not mass transport to the adsorption sites.
hydrogen storage, titanate nanotubes, prussian-blue analogue, kinetics, diffusion, thermodynamics
6406-6416
Zamora, B.
8924a223-c604-4d73-87d7-edb261cd10e6
Al-Hajjaj, A.A.
94ecc7bb-9ee6-43f7-8510-f241504ee29f
Shah, A.A.
5c43ac37-c4a7-4256-88ef-8c427886b924
Bavykin, D.V.
1e9fabfc-d078-4585-876f-85ff33b7eed5
Reguera, E.
0b7659a1-5153-4a5c-877a-95f663a0c555
20 May 2013
Zamora, B.
8924a223-c604-4d73-87d7-edb261cd10e6
Al-Hajjaj, A.A.
94ecc7bb-9ee6-43f7-8510-f241504ee29f
Shah, A.A.
5c43ac37-c4a7-4256-88ef-8c427886b924
Bavykin, D.V.
1e9fabfc-d078-4585-876f-85ff33b7eed5
Reguera, E.
0b7659a1-5153-4a5c-877a-95f663a0c555
Zamora, B., Al-Hajjaj, A.A., Shah, A.A., Bavykin, D.V. and Reguera, E.
(2013)
Kinetic and thermodynamic studies of hydrogen adsorption on titanate nanotubes decorated with a Prussian blue analogue.
International Journal of Hydrogen Energy, 38 (15), .
(doi:10.1016/j.ijhydene.2013.02.031).
Abstract
In this paper, the kinetic and thermodynamic hydrogen adsorption characteristics of a novel composite comprising TiNT decorated with the Prussian blue analogue Cd3FeIII are investigated at high pressures and different temperatures. It is shown that boundary-layer (film) diffusion does not play a limiting role in the mass transport of hydrogen inside the composite material. The diffusion coefficient and time constant at different temperatures and pressures are calculated using an intra-particle diffusion model. The results suggest that molecular diffusion dominates Knudsen diffusion in the composite material. There are clear improvements in the mass transport characteristics compared to bulk Cd3FeIII. The Gibb's free energy is estimated by fitting isotherm equilibrium data to the Dubinin–Astakhov model and is used to calculate the enthalpy and the entropy of adsorption. The calculated value of enthalpy is characteristic of a physisorption process and is considerably higher than the activation energy for intraparticle diffusion, suggesting that the rate-limiting step of hydrogen is not mass transport to the adsorption sites.
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e-pub ahead of print date: 11 April 2013
Published date: 20 May 2013
Keywords:
hydrogen storage, titanate nanotubes, prussian-blue analogue, kinetics, diffusion, thermodynamics
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 354014
URI: http://eprints.soton.ac.uk/id/eprint/354014
ISSN: 0360-3199
PURE UUID: f97bd27e-5ae7-4798-aa17-22d1ffa98e99
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Date deposited: 28 Jun 2013 09:01
Last modified: 14 Mar 2024 14:13
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Contributors
Author:
B. Zamora
Author:
A.A. Al-Hajjaj
Author:
A.A. Shah
Author:
E. Reguera
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