Improved hydrogen storage performance of defected carbon nanotubes with Pd spillover catalysts dispersed using supercritical CO2 fluid

Chih Yao Chen; Jeng-Kuei Chang; Wen Ta Tsai

doi:10.1016/j.ijhydene.2011.11.084

Improved hydrogen storage performance of defected carbon nanotubes with Pd spillover catalysts dispersed using supercritical CO2 fluid

Chih Yao Chen, Jeng-Kuei Chang^*, Wen Ta Tsai

^*Corresponding author for this work

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

Hydrogen storage properties of carbon nanotubes (CNTs) modified by oxidative etching and decoration of Pd spillover catalysts are investigated. A mixed H₂SO₄/H₂O₂ solution containing ferrous ions (Fe²⁺) is useful to open the caps, to shorten the length, and to generate defects on CNTs. The Pd catalysts are deposited on the CNTs with the aid of supercritical carbon dioxide (scCO₂); as a result, a highly dispersed Pd nanoparticles and an intimate connection between Pd and carbon surface can be obtained. Combination of the two approaches can optimize a hydrogen spillover reaction on CNTs, resulting in a superior hydrogen storage capacity of 1.54 wt% (at 25 °C and 6.89 MPa), which corresponds to an enhancement factor of ∼4.5 as compared to that of pristine CNTs.

Original language	English
Pages (from-to)	3305-3312
Number of pages	8
Journal	International Journal of Hydrogen Energy
Volume	37
Issue number	4
DOIs	https://doi.org/10.1016/j.ijhydene.2011.11.084
State	Published - 1 Feb 2012

Keywords

Hydrogen storage
Nanostructured carbon
Oxidative etching
Spillover
Supercritical fluid

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.ijhydene.2011.11.084

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title = "Improved hydrogen storage performance of defected carbon nanotubes with Pd spillover catalysts dispersed using supercritical CO2 fluid",

abstract = "Hydrogen storage properties of carbon nanotubes (CNTs) modified by oxidative etching and decoration of Pd spillover catalysts are investigated. A mixed H2SO4/H2O2 solution containing ferrous ions (Fe2+) is useful to open the caps, to shorten the length, and to generate defects on CNTs. The Pd catalysts are deposited on the CNTs with the aid of supercritical carbon dioxide (scCO2); as a result, a highly dispersed Pd nanoparticles and an intimate connection between Pd and carbon surface can be obtained. Combination of the two approaches can optimize a hydrogen spillover reaction on CNTs, resulting in a superior hydrogen storage capacity of 1.54 wt% (at 25 °C and 6.89 MPa), which corresponds to an enhancement factor of ∼4.5 as compared to that of pristine CNTs.",

keywords = "Hydrogen storage, Nanostructured carbon, Oxidative etching, Spillover, Supercritical fluid",

author = "Chen, {Chih Yao} and Jeng-Kuei Chang and Tsai, {Wen Ta}",

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T1 - Improved hydrogen storage performance of defected carbon nanotubes with Pd spillover catalysts dispersed using supercritical CO2 fluid

AU - Chen, Chih Yao

AU - Chang, Jeng-Kuei

AU - Tsai, Wen Ta

PY - 2012/2/1

Y1 - 2012/2/1

N2 - Hydrogen storage properties of carbon nanotubes (CNTs) modified by oxidative etching and decoration of Pd spillover catalysts are investigated. A mixed H2SO4/H2O2 solution containing ferrous ions (Fe2+) is useful to open the caps, to shorten the length, and to generate defects on CNTs. The Pd catalysts are deposited on the CNTs with the aid of supercritical carbon dioxide (scCO2); as a result, a highly dispersed Pd nanoparticles and an intimate connection between Pd and carbon surface can be obtained. Combination of the two approaches can optimize a hydrogen spillover reaction on CNTs, resulting in a superior hydrogen storage capacity of 1.54 wt% (at 25 °C and 6.89 MPa), which corresponds to an enhancement factor of ∼4.5 as compared to that of pristine CNTs.

AB - Hydrogen storage properties of carbon nanotubes (CNTs) modified by oxidative etching and decoration of Pd spillover catalysts are investigated. A mixed H2SO4/H2O2 solution containing ferrous ions (Fe2+) is useful to open the caps, to shorten the length, and to generate defects on CNTs. The Pd catalysts are deposited on the CNTs with the aid of supercritical carbon dioxide (scCO2); as a result, a highly dispersed Pd nanoparticles and an intimate connection between Pd and carbon surface can be obtained. Combination of the two approaches can optimize a hydrogen spillover reaction on CNTs, resulting in a superior hydrogen storage capacity of 1.54 wt% (at 25 °C and 6.89 MPa), which corresponds to an enhancement factor of ∼4.5 as compared to that of pristine CNTs.

KW - Hydrogen storage

KW - Nanostructured carbon

KW - Oxidative etching

KW - Spillover

KW - Supercritical fluid

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Improved hydrogen storage performance of defected carbon nanotubes with Pd spillover catalysts dispersed using supercritical CO2 fluid

Abstract

Keywords

UN SDGs

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