Universität zu Köln

Chen, Yuqi, Yang, Minjun ORCID: 0000-0001-8829-5883, Cooper, Joshaniel F. K., Clarke, Simon J., Rasche, Bertold ORCID: 0000-0002-9691-1903 and Compton, Richard G. (2020). Designing Selective Electrode Materials for Electroanalysis -New Tungsten Bronzes as Selective Potassium Hosts. ChemElectroChem, 7 (14). S. 3160 - 3168. WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 2196-0216

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Abstract

Commercially available monoclinic tungsten oxide WO3(Pearson symbolmP32) is investigated electrochemically for its selectivity and sensitivity towards potassium ion detection. Electroreduction in aqueous potassium chloride solution shows two distinct phases, identified as tungsten bronzes KxWO3(phase 1: maximumx(1)approximate to 0.1 and phase 2: maximumx(2)approximate to 0.3). In situ synchrotron powder X-ray diffraction reveals the concomitant structural changes, and both phases are identified as new, so far unreported, perovskite-derived potassium bronzes (space groupP4/nmmandI4?3 m, respectively). In cyclic voltammetry, only the first insertion step is found to be reversible. Potentiostatic insertion and the subsequent voltammetric de-insertion show selectivity toward potassium against lithium and sodium in 0.1 M aqueous solutions. The sensitivity towards potassium is analysed in a concentration range between 1 mM and 100 mM. Two linear regions are found for the response, which we relate to two different rate-determining steps, depending on the concentration of potassium in solution.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Chen, Yuqi UNSPECIFIED UNSPECIFIED UNSPECIFIED Yang, Minjun UNSPECIFIED orcid.org/0000-0001-8829-5883 UNSPECIFIED Cooper, Joshaniel F. K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Clarke, Simon J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rasche, Bertold UNSPECIFIED orcid.org/0000-0002-9691-1903 UNSPECIFIED Compton, Richard G. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-326229
DOI:	10.1002/celc.202000851
Journal or Publication Title:	ChemElectroChem
Volume:	7
Number:	14
Page Range:	S. 3160 - 3168
Date:	2020
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	2196-0216
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LITHIUM IONS; CRYSTAL; OXIDE; OPTIMIZATION; CHEMISTRY; SENSOR Multiple languages Electrochemistry Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/32622