Effect of thermal treatments and palladium loading an hydrogen sorption characteristics of single-walled carbon nanotubes

Date

2008-03-01

Author

KOCABAŞ, SEFA
KOPAÇ, TÜRKAN
DOĞU, GÜLŞEN
Doğu, Timur

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

70
views

0
downloads

The effects of thermal treatments and palladium loading on sorption characteristics of single-walled carbon nanotube (SWCNT) samples were investigated. The thermal treatment experiments were carried out in a temperature range of 300-800 degrees C. The sorption characteristics of nitrogen and hydrogen on the original, heat treated and the palladium loaded samples were investigated. Analyzing the nitrogen adsorption isotherms on these samples at 77.4 K, the highest specific surface area of 2230 m(2)/g was obtained at 575 degrees C, while the original samples had a specific surface area of 230 m(2)/g. The highest surface area samples obtained at 575 degrees C were loaded by 3.3, 6.3 and 10.1 wt% palladium and hydrogen adsorption isotherms on these samples were obtained at 77.4 K. The hydrogen sorption capacities of the original and the 10.1 wt% palladium loaded samples were found to be 0.76 and 1.66 wt%, respectively. it was shown that by controlling the temperature of heat treatment, the specific surface area of the samples could be increased and the spillover effect of palladium could enhance the hydrogen sorption. (c) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.

Subject Keywords

Carbon nanotubes, Heat treatment, Palladium loading, Hydrogen sorption

URI

https://hdl.handle.net/11511/30074

Journal

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

DOI

https://doi.org/10.1016/j.ijhydene.2008.01.004

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Effect of carbon nanotube surface treatment on the morphology, electrical, and mechanical properties of the microfiber-reinforced polyethylene/poly(ethylene terephthalate)/carbon nanotube composites Yesil, Sertan; Bayram, Göknur (2013-01-15) The aim of this study is to investigate the effects of carbon nanotube (CNT) chemical properties, CNT content, and molding temperature on the morphology, electrical, and mechanical properties of the microfiber-reinforced polymer composites. These composites were prepared by extrusion and hot stretching the poly(ethylene terephthalate) (PET)/CNT phase in high density polyethylene (HDPE) matrix. Surfaces of the CNT were modified by purification with strong acid mixture (HNO3 : H2SO4 mixture 1 : 1 by volume) f...
Effects of oxidative functionalized and aminosilanized carbon nanotubes on the crystallization behaviour of polyamide-6 nanocomposites Kaynak, Cevdet (2014-04-01) The purpose of this study is to investigate effects of oxidative functionalized and aminosilanized carbon nanotubes on the (1) isothermal and (2) non-isothermal crystallization kinetics of polyamide-6 by DSC analyses, and (3) crystal structure of injection molded specimens by XRD analyses. Nanocomposites were compounded by using melt mixing technique via twin screw extrusion. Due to basically very effective heterogeneous nucleation effect, both increasing amount and surface functionalization of carbon nanot...
Effects of silica nanoparticles on the performance of water-based drilling fluids Kök, Mustafa Verşan; Bal, Berk (2019-09-01) In this research, two groups of experiments were conducted to investigate the effects of silica (SiO2) nanoparticles on the filtration and rheological properties of water-based drilling fluids. In the first group, bentonite, chrome-free lignosulfonate (CFL) and carboxymethyl cellulose (CMC) were used in different concentrations to obtain base fluids. Nanofluids were prepared by adding 0.5 g of four different silica nanoparticles into these drilling fluids. Comparison of rheological properties, fluid loss am...
Effect of molecular and electronic structure on the light-harvesting properties of dye sensitizers Mete, E.; Üner, Deniz; Cakmak, M.; Gulseren, O.; Ellialtoglu, S. (American Chemical Society (ACS), 2007-05-24) The systematic trends in structural and electronic properties of perylenediimide (PDI)-derived dye molecules have been investigated by DFT calculations based on the projector-augmented wave (PAW) method including gradient-corrected exchange-correlation effects. Time-dependent density functional theory (TDDFT) calculations have been performed to study the visible absorbance activity of these complexes. The effect of different ligands and halogen atoms attached to PDI were studied to characterize the light-ha...
Effects of reactor geometry on dissociating CO2 and electrode degradation in a MHCD plasma reactor Taylan, Onur; Pinero, Daniel; Berberoğlu, Halil (2018-08-01) This paper reports an experimental study on the effects of reactor geometry for dissociating carbon dioxide using a microhollow cathode discharge (MHCD) reactor, and the associated electrode degradation. A MHCD reactor consists of two hollow metal electrodes that are separated by dielectric material. The geometric reactor parameters studied were the dielectric material thickness and the diameter of the reactor hole. Dielectric thicknesses of 150, 300 and 450 mu m and discharge hole diameters of 200, 400 and...

Citation Formats

S. KOCABAŞ, T. KOPAÇ, G. DOĞU, and T. Doğu, “Effect of thermal treatments and palladium loading an hydrogen sorption characteristics of single-walled carbon nanotubes,” INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, pp. 1693–1699, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30074.