Universität zu Köln

Raauf, Aida ORCID: 0000-0001-7222-5266, Graf, David, Gonullu, Yakup, Sekhar, Praveen K., Frank, Michael and Mathur, Sanjay (2021). Synergistic Acceptor-Donor Interplay of Nd2Sn2O7 Pyrochlore based Sensor in Selective Detection of Hydrogen. J. Electrochem. Soc., 168 (4). PENNINGTON: ELECTROCHEMICAL SOC INC. ISSN 1945-7111

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Abstract

Nanostructured thin film of Nd2Sn2O7 pyrochlore obtained by solution processing of a single molecular precursor with Nd-Sn ratio of 1:1 was found to show unprecedently high selectivity towards hydrogen sensing in the temperature range 200 degrees C-450 degrees C. Formation of crystalline Nd2Sn2O7 upon annealing the xerogel in air at 800 degrees C was confirmed by powder X-ray diffraction analysis. The heat-treated pyrochlore films exhibited a porous structure with interconnected grains confirmed by scanning electron microscope images. The gas sensing behavior of the device towards various analyte gases (H-2, CO, CH4, NO2, NH3) showed remarkably high selectivity towards H-2, while no sensor response against other reducing and oxidizing gases was monitored. The highest sensitivity towards H-2 was detected at 300 degrees C with a linear trend observed in the sensitivity values and H-2 concentration (5%-30%). Intercorrelated analysis of sensor characteristics, surface spectroscopy before and after hydrogen treatment and implications of unique crystallographic features of the pyrochlore lattice demonstrated a novel defined subsequent detection mechanism, which strongly differs from conventional binary oxides like SnO2. The significant increase in operating temperature upon H-2 exposure is apparently caused by the exothermic reaction between pyrochlore and molecular hydrogen to generate highly reactive hydride species during the detection mechanism. The high efficiency and reproducibility of the investigated sensor devices indicates the potential of Nd2Sn2O7 based sensors for hydrogen safety applications.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Raauf, Aida UNSPECIFIED orcid.org/0000-0001-7222-5266 UNSPECIFIED Graf, David UNSPECIFIED UNSPECIFIED UNSPECIFIED Gonullu, Yakup UNSPECIFIED UNSPECIFIED UNSPECIFIED Sekhar, Praveen K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Frank, Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-569977
DOI:	10.1149/1945-7111/abf013
Journal or Publication Title:	J. Electrochem. Soc.
Volume:	168
Number:	4
Date:	2021
Publisher:	ELECTROCHEMICAL SOC INC
Place of Publication:	PENNINGTON
ISSN:	1945-7111
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GAS SENSORS; OXIDES; SNO2; NANOFIBERS; METHANE; SURFACE; MODEL; H-2 Multiple languages Electrochemistry; Materials Science, Coatings & Films Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/56997