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

被引：17

作者：

Chen, Chih-Yao ^{[1
,2
]}

Chang, Jeng-Kuei ^{[1
]}

Tsai, Wen-Ta ^{[2
]}

机构：

[1] Natl Cent Univ, Inst Mat Sci & Engn, Tao Yuan, Taiwan

[2] Natl Cheng Kung Univ, Dept Mat Sci & Engn, Tainan 70101, Taiwan

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2012年 / 37卷 / 04期

关键词：

Hydrogen storage; Nanostructured carbon; Oxidative etching; Spillover; Supercritical fluid; NANOPARTICLES; ADSORPTION; PLATINUM; CAPACITY; ELECTROCATALYST; TEMPERATURE; SATURATION; DEPOSITION; OXIDATION;

D O I：

10.1016/j.ijhydene.2011.11.084

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 (scCO(2)); 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 degrees C and 6.89 MPa), which corresponds to an enhancement factor of similar to 4.5 as compared to that of pristine CNTs. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：3305 / 3312

页数：8

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