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High-Temperature Hydrogen Sensing Performance of Ni-Doped TiO2 Prepared by Co-Precipitation Method

Lontio Fomekong, Roussin and Kelm, Klemens and Saruhan-Brings, Bilge (2020) High-Temperature Hydrogen Sensing Performance of Ni-Doped TiO2 Prepared by Co-Precipitation Method. Sensors, 20. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/s20215992. ISSN 1424-8220.

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Abstract

This work deals with the substantially high-temperature hydrogen sensors required by combustion and processing technologies. It reports the synthesis of undoped and Ni-doped TiO2 (with 0, 0.5, 1 and 2 mol.% of Ni) nanoparticles by a co-precipitation method and the obtained characteristics applicable for this purpose. The effect of nickel doping on the morphological variation, as well as on the phase transition from anatase to rutile, of TiO2 was investigated by scanning electron microscopy, X-ray diffraction and Raman spectroscopy. The resistive sensors prepared with these powders were tested toward H2 at 600 ◦C. The results indicate that 0.5% Ni-doped TiO2 with almost equal amounts of anatase and rutile shows the best H2 sensor response (DR/R0 = 72%), response rate and selectivity. The significant improvement of the sensing performance of 0.5% Ni-doped TiO2 is mainly attributed to the formation of the highest number of n-n junctions present between anatase and rutile, which influence the quantity of adsorbed oxygen (i.e., the active reaction site) on the surface and the conductivity of the material.

Item URL in elib:https://elib.dlr.de/136970/
Document Type:Article
Title:High-Temperature Hydrogen Sensing Performance of Ni-Doped TiO2 Prepared by Co-Precipitation Method
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lontio Fomekong, RoussinRoussin.LontioFomekong (at) dlr.deUNSPECIFIED
Kelm, KlemensKlemens.Kelm (at) dlr.deUNSPECIFIED
Saruhan-Brings, BilgeBilge.Saruhan (at) dlr.deUNSPECIFIED
Date:22 October 2020
Journal or Publication Title:Sensors
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:20
DOI :10.3390/s20215992
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Series Name:Special Issue "Selected Papers from 16th International Conference on Optical and Electronic Sensors (COE 2020)"
ISSN:1424-8220
Status:Published
Keywords:hydrogen, gas sensing, titana, doping, nickel
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Saruhan-Brings, Dr. Bilge
Deposited On:03 Nov 2020 10:21
Last Modified:03 Nov 2020 10:21

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