ISSN: 0256-1115 (print version) ISSN: 1975-7220 (electronic version)
Copyright © 2024 KICHE. All rights reserved

Articles & Issues

Language
English
Conflict of Interest
In relation to this article, we declare that there is no conflict of interest.
Publication history
Received October 27, 2005
Accepted December 14, 2005
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright © KIChE. All rights reserved.

All issues

Thermoelectric hydrogen sensor using LixNi1-xO synthesized by molten salt method

Sensors and Materials Research Center, Korea Institute of Energy Research, 71-2, Jangdong, Yuseong, Daejeon 305-343, Korea 1Department of Chemistry, Maharshi Dayanand University, Rohtak-124 001, India
hanchi@kier.re.kr
Korean Journal of Chemical Engineering, May 2006, 23(3), 362-366(5), 10.1007/BF02706735
downloadDownload PDF

Abstract

Li-doped NiO was synthesized by molten salt method. LiNO3-LiOH flux was used as a source for Li doping. NiCl2 was added to the molten Li flux and then processed to make the Li-doped NiO material. Li:Ni ratios were maintained from 5 : 1 to 30 : 1 during the synthetic procedure and the chemical compositions after characterization were found from Li0.08Ni0.92O to Li0.16Ni0.84O. Li doping did not change the basic cubic structural characteristics of NiO as evidenced by XRD studies; however, the lattice parameter decreased from 0.41769 nm in pure NiO to 0.41271 nm in Li0.16Ni0.84O. Hydrogen gas sensors were fabricated by using these materials as thick films on alumina substrates. The half surface of each sensor was coated with the Pt catalyst. The sensor, when exposed to the hydrogen gas blended in air, heated up the catalytic surface leaving the rest half surface (without catalyst) cold. The thermoelectric voltage thus built up along the hot and cold surface of the Li-doped NiO made the basis for detecting hydrogen gas. The linearity of the voltage signal vs H2 concentration was checked up to 4% of H2 in air (as higher concentrations above 4.65% are explosive in air) using Li0.10Ni0.90O as the sensor material. The response time T90 and the recovery time RT90 were less than 25 sec. H2 concentration from 0.5% to 4% showed a good linearity against voltage. There was minimum interference of other gases and hence H2 gas can easily be detected.

References

Dirksen JA, Duval K, Ring TA, Sens. Actuators B-Chem., 80, 106 (2001) 
Hong YS, Han CH, Kim K, Chem. Lett.(12), 1384 (2000) 
Hotovy I, Huran J, Siciliano P, Capone S, Spiess L, Rehacek V, Sens. Actuators B-Chem., 78, 126 (2001) 
Hotovy I, Huran J, Spiess L, Capkovic R, Hascik S, Vacuum, 58, 300 (2000) 
Hotovy I, Rehacek V, Siciliano P, Capone S, Spiess L, Thin Solid Films, 418(1), 9 (2002) 
Joint Commission on Powder Diffraction Spectroscopy-International Center for Diffraction Data, Swarthmore, PA, Card No. 04-0835 (1994)
Mackrodt WC, Harrison NM, Saunders VR, Allan NL, Towler MD, Chem. Phys. Lett., 250, 66 (1996) 
Matsumiya M, Qiu F, Shin W, Izu N, Murayama N, Kanzaki S, Thin Solid Films, 419(1-2), 213 (2002) 
Matsumiya M, Shin W, Izu N, Murayama N, Sens. Actuators B-Chem., 93, 309 (2003) 
Matsumiya M, Shin W, Qiu F, Izu N, Matsubara I, Murayama N, Sens. Actuators B-Chem., 96, 516 (2003) 
Qiu F, Matsumiya M, Shin W, Izu N, Murayama N, Sens. Actuators B-Chem., 94, 152 (2003) 
Qiu F, Shin W, Matsumiya M, Izu N, Matsubara I, Murayama N, Sens. Actuators B-Chem., 103, 252 (2004) 
Sato H, Minami T, Takata S, Yamada T, Thin Solid Films, 236(1-2), 27 (1993) 
Schmidt R, Brinkman AW, Int. J. Inorg. Mater., 3, 1215 (2001) 
Shin W, Matsumiya M, Izu N, Murayama N, Sens. Actuators B-Chem., 93, 304 (2003) 
Shin W, Matsumiya M, Qiu F, Izu N, Murayama N, Sens. Actuators B-Chem., 97, 344 (2004) 
Shin W, Murayama N, Ikeda K, Sago S, J. Power Sources, 103(1), 80 (2001) 
Vakiv MM, Shpotyuk OI, Balitska VO, Butkiewicz B, Shpotyuk LI, J. European Ceram. Soc., 24, 1243 (2004) 
Wu J, Nan J, Nan CW, Deng Y, Lin Y, Zhao S, Phys. Status Solidi A-Appl. Res., 193, 78 (2002)
Zainullina VM, Korotin MA, Zaikov YP, Shurov NI, Solid State Science, 6, 1139 (2004) 

The Korean Institute of Chemical Engineers. F5, 119, Anam-ro, Seongbuk-gu, 233 Spring Street Seoul 02856, South Korea.
TEL. No. +82-2-458-3078FAX No. +82-507-804-0669E-mail : kiche@kiche.or.kr

Copyright (C) KICHE.all rights reserved.

- Korean Journal of Chemical Engineering 상단으로