Universität zu Köln

Sekhar, Praveen K., Graf, David ORCID: 0000-0002-0504-8527, Ojelere, Olusola ORCID: 0000-0002-3112-1257, Saha, Tonmoy Kumar, Riheen, Manjurul Ahsan and Mathur, Sanjay ORCID: 0000-0003-2765-2693 (2020). Electrochemical Gas Sensor Integrated with Vanadium Monoxide Nanowires for Monitoring Low Concentrations of Ammonia Emission. J. Electrochem. Soc., 167 (2). PENNINGTON: ELECTROCHEMICAL SOC INC. ISSN 1945-7111

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Abstract

An electrochemical sensor for the detection of extremely low concentration of ammonia (1 part per billion, ppb) was fabricated by integrating vanadium monoxide (VOx; x = 0.8-1.2) nanowires on the platinum electrodes. The nanowire-based sensor responds at room temperature non-linearly to a staircase sequence of ammonia from 1 ppb to 100 ppb. The rise and fall time of the nanowire sensor was found to be 10 s and 9 s, respectively. While the immobilization of VO nanowires increased the electrochemical surface area, the defect rich and ionic nature of the VO surface (V2+O2-) facilitated the chemical interaction and adsorption of polar ammonia molecules as evident in the room temperature response of the VO@Pt amperometric electrochemical sensor. The availability of metal centered d-electrons and the semiconductor nature of vanadium monoxide lowered the interfacial resistance of the nanowire-modified sensor enabling the lower detection limit of ammonia. The sensor seems to respond to CH4, H2S and C3H6 as well although the NH3 response is nearly six-fold compared to these common interfering compounds. The results pave the way for a low-cost alternative paper-based sensor to monitor ammonia emissions primarily from confined animal feeding operations (CAFOs). (c) 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Sekhar, Praveen K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Graf, David UNSPECIFIED orcid.org/0000-0002-0504-8527 UNSPECIFIED Ojelere, Olusola UNSPECIFIED orcid.org/0000-0002-3112-1257 UNSPECIFIED Saha, Tonmoy Kumar UNSPECIFIED UNSPECIFIED UNSPECIFIED Riheen, Manjurul Ahsan UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED orcid.org/0000-0003-2765-2693 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-345399
DOI:	10.1149/1945-7111/ab7114
Journal or Publication Title:	J. Electrochem. Soc.
Volume:	167
Number:	2
Date:	2020
Publisher:	ELECTROCHEMICAL SOC INC
Place of Publication:	PENNINGTON
ISSN:	1945-7111
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ANIMAL FEEDING OPERATIONS; PAPER; DEPOSITION; FEEDLOT Multiple languages Electrochemistry; Materials Science, Coatings & Films Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/34539