Universität zu Köln

Fomekong, Roussin Lontio, You, Shujie ORCID: 0000-0001-7475-6394, Frohnhoven, Robert, Ludwig, Tim ORCID: 0000-0002-3633-805X, Mathur, Sanjay and Saruhan, Bilge (2021). Self-decoration of Barium Titanate with Rhodium-NP via a facile co-precipitation route for NO sensing in hot gas environment. Sens. Actuator B-Chem., 338. LAUSANNE: ELSEVIER SCIENCE SA. ISSN 0925-4005

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Abstract

There is an urgent need to develop real-time gas sensors capable of detection under hot-gas (>400 degrees C) flow, for applications such as exhaust emission control. In this context, Rh-doped BaTiO3 has been prepared by a coprecipitation route and heat-treated at 900 degrees C under 2 % hydrogen to obtain in-situ Rh-nanoparticle decoration of submicron BaTiO3 particles. X-ray diffraction, Raman, and X-Ray photoelectron spectrometry analysis confirm the presence of Barium Titanate phases and the substitution of Ti4+ by Rh3+. According to the analytic evidence, thermal hydrogen treatment leads probably to Rhodium diffusion out of titanate lattice, yielding a selfdecoration of the nano-sized Barium Titanate particles. Further NO-sensing tests revealed that the sensors produced by deposition of this in-situ Rh-loaded BaTiO3 on the interdigitated electrodes (IDE) yield a significant increase of selectivity and response (similar to 18 % for 200 ppm NO) towards NO, for the first time, under a hot-gas environment reaching up to 900 degrees C as synthetic humid air being the carrier gas. The calculated response and recovery times are reasonable, and observed reproducibility confirms suitability to practical applications. Relying on the carried investigations, this good sensing performance can be explained by the creation of excessive oxygen vacancies resulting from Rhodium?s surface diffusion. Moreover, it is to claim that excellent catalytic activity of Rhodium plays a key role in enhancing NO-sensing performance.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Fomekong, Roussin Lontio UNSPECIFIED UNSPECIFIED UNSPECIFIED You, Shujie UNSPECIFIED orcid.org/0000-0001-7475-6394 UNSPECIFIED Frohnhoven, Robert UNSPECIFIED UNSPECIFIED UNSPECIFIED Ludwig, Tim UNSPECIFIED orcid.org/0000-0002-3633-805X UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED Saruhan, Bilge UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-588236
DOI:	10.1016/j.snb.2021.129848
Journal or Publication Title:	Sens. Actuator B-Chem.
Volume:	338
Date:	2021
Publisher:	ELSEVIER SCIENCE SA
Place of Publication:	LAUSANNE
ISSN:	0925-4005
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/58823