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Effect of Oxidization Temperatures and Aging on Performance of Carbonate Melt Oxidized Iridium Oxide pH Electrode

Iridium oxide pH electrodes employing the carbonate melt oxidation method were fabricated with oxidation temperatures of 750 °C, 800 °C and 850 °C, respectively. Scanning electron microscope (SEM) and atomic force microscope (AFM) images showed that the oxide film regularized with the increase in ox...

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Autores principales: Wang, Penggang, Guo, Tengfei, Zhao, Tiejun, Du, Zhenxing, Jin, Zuquan, Dong, Biqin, Li, Zhe
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6865079/
https://www.ncbi.nlm.nih.gov/pubmed/31683922
http://dx.doi.org/10.3390/s19214756
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author Wang, Penggang
Guo, Tengfei
Zhao, Tiejun
Du, Zhenxing
Jin, Zuquan
Dong, Biqin
Li, Zhe
author_facet Wang, Penggang
Guo, Tengfei
Zhao, Tiejun
Du, Zhenxing
Jin, Zuquan
Dong, Biqin
Li, Zhe
author_sort Wang, Penggang
collection PubMed
description Iridium oxide pH electrodes employing the carbonate melt oxidation method were fabricated with oxidation temperatures of 750 °C, 800 °C and 850 °C, respectively. Scanning electron microscope (SEM) and atomic force microscope (AFM) images showed that the oxide film regularized with the increase in oxidation temperatures. The pH response, response time and long-term stability of the electrodes indicated that the electrodes made at 850 °C had the best performance. X-ray photoelectron spectra (XPS) surveys investigated the change in the electrodes’ chemical composition and element oxidation states at 850 °C, and the results showed that the relative content of Ir(3+) had increased by 23.9%, and the Ir(4+) and Ir(6+) had decreased by 10.9% and 13%, respectively, in the surface oxide layer after one month of aging. However, the relative contents of Ir(3+), Ir(4+) and Ir(6+) were almost constant for the inner oxide layer. Meanwhile, the XPS result also indicated that the outer oxide layer of the electrode had a higher hydration degree than the inner oxide layer.
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spelling pubmed-68650792019-12-06 Effect of Oxidization Temperatures and Aging on Performance of Carbonate Melt Oxidized Iridium Oxide pH Electrode Wang, Penggang Guo, Tengfei Zhao, Tiejun Du, Zhenxing Jin, Zuquan Dong, Biqin Li, Zhe Sensors (Basel) Article Iridium oxide pH electrodes employing the carbonate melt oxidation method were fabricated with oxidation temperatures of 750 °C, 800 °C and 850 °C, respectively. Scanning electron microscope (SEM) and atomic force microscope (AFM) images showed that the oxide film regularized with the increase in oxidation temperatures. The pH response, response time and long-term stability of the electrodes indicated that the electrodes made at 850 °C had the best performance. X-ray photoelectron spectra (XPS) surveys investigated the change in the electrodes’ chemical composition and element oxidation states at 850 °C, and the results showed that the relative content of Ir(3+) had increased by 23.9%, and the Ir(4+) and Ir(6+) had decreased by 10.9% and 13%, respectively, in the surface oxide layer after one month of aging. However, the relative contents of Ir(3+), Ir(4+) and Ir(6+) were almost constant for the inner oxide layer. Meanwhile, the XPS result also indicated that the outer oxide layer of the electrode had a higher hydration degree than the inner oxide layer. MDPI 2019-11-01 /pmc/articles/PMC6865079/ /pubmed/31683922 http://dx.doi.org/10.3390/s19214756 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wang, Penggang
Guo, Tengfei
Zhao, Tiejun
Du, Zhenxing
Jin, Zuquan
Dong, Biqin
Li, Zhe
Effect of Oxidization Temperatures and Aging on Performance of Carbonate Melt Oxidized Iridium Oxide pH Electrode
title Effect of Oxidization Temperatures and Aging on Performance of Carbonate Melt Oxidized Iridium Oxide pH Electrode
title_full Effect of Oxidization Temperatures and Aging on Performance of Carbonate Melt Oxidized Iridium Oxide pH Electrode
title_fullStr Effect of Oxidization Temperatures and Aging on Performance of Carbonate Melt Oxidized Iridium Oxide pH Electrode
title_full_unstemmed Effect of Oxidization Temperatures and Aging on Performance of Carbonate Melt Oxidized Iridium Oxide pH Electrode
title_short Effect of Oxidization Temperatures and Aging on Performance of Carbonate Melt Oxidized Iridium Oxide pH Electrode
title_sort effect of oxidization temperatures and aging on performance of carbonate melt oxidized iridium oxide ph electrode
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6865079/
https://www.ncbi.nlm.nih.gov/pubmed/31683922
http://dx.doi.org/10.3390/s19214756
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