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Investigation of hydrogen storage behavior of silicon nanoparticles

DSpace at IIT Bombay

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Title Investigation of hydrogen storage behavior of silicon nanoparticles
 
Creator KALE, P
GANGAL, AC
EDLA, R
SHARMA, P
 
Subject Porous Silicon
Ultrasonication
Hydrogen absorption
HYDROFLUORIC ACID SOLUTIONS
POROUS SILICON
MOLECULAR-HYDROGEN
ADSORPTION
SURFACES
 
Description Porous Silicon (PS) freestanding film is a derivative of single crystal Si wafer. PS films obtained on electrochemical etching of p-type silicon (Si) wafer were used to synthesize Si nanoparticles by ultrasonication. 12 mu m thick and 29% porous freestanding PS films were sonicated for 4 h in 120 W ultrasonication bath at 42 kHz. HRTEM image shows Si nanoparticles in the range of 8-20 nm in size. In this paper we present results of hydrogen absorption experiments conducted on Si nanoparticles. Standard Seivert's type apparatus was used to carry out hydrogen absorption pressure composition isotherm measurements in the pressure range of 1-10 bar and in the temperature range of 29 degrees C-150 degrees C. Theoretically SiHx system has 3.44, 6.66 and 9.67 wt% of hydrogen for x = 1, 2, 3 respectively. Experimental results show maximum hydrogen uptake of 2.25 wt% at the temperature of 120 degrees C and at 9.76 bar pressure. Hydrogenation of Si nanoparticles exhibits frequency downshifts from 510.7 to 507.3 cm(-1) in Raman spectra. Raman peaks were de-convoluted in two bands to study effect of hydrogenation on FWHM, crystallanity and elastic strain of the nanoparticles. Bonding between Si, 0 and H atoms were investigated using Fourier transform infrared spectroscopy(FTIR) spectroscopy. UV-Vis spectra and Tauc plots were used to discuss the relation between hydrogenation and optical band gap of the Si nanoparticles. Optical band gap was found to increase from 1.6 to 2.25 eV on subjecting Si nanoparticles to hydrogenation. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2014-10-16T07:09:12Z
2014-10-16T07:09:12Z
2012
 
Type Article; Proceedings Paper
 
Identifier INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 37(4)3741-3747
0360-3199
1879-3487
http://dx.doi.org/10.1016/j.ijhydene.2011.04.054
http://dspace.library.iitb.ac.in/jspui/handle/100/15515
 
Language en