Academic Journal
Performance of All-Solid-State MoOx pH Sensors Prepared via Thermal Oxidation for Robust Applications
| العنوان: | Performance of All-Solid-State MoOx pH Sensors Prepared via Thermal Oxidation for Robust Applications |
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| المؤلفون: | Aoubida, Djouhar, Betelu, Stephanie, Bertrand, Johan, Pham, Quoc, Nghi, Dragoe, Diana, Dragoe, Nita, Ignatiadis, Ioannis |
| المساهمون: | Bureau de Recherches Géologiques et Minières (BRGM), Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Institut de Chimie - CNRS Chimie (INC-CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Agence Nationale pour la Gestion des Déchets Radioactifs (ANDRA), Université Paris-Saclay |
| المصدر: | ISSN: 1424-8220 ; Sensors ; https://brgm.hal.science/hal-04918447 ; Sensors, 2025, 25 (3), pp.611. ⟨10.3390/s25030611⟩. |
| بيانات النشر: | CCSD MDPI |
| سنة النشر: | 2025 |
| المجموعة: | BRGM: HAL (Bureau de Recherches Géologiques et Minières) |
| مصطلحات موضوعية: | all-solid-state electrodes, pH sensor, redox potential, nuclear waste, geological disposal monitoring, thermal oxidation, molybdenum oxide electrode, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
| الوصف: | International audience ; In this study, we investigated the morphology, chemical composition and pH measurement performance of MoO x electrodes prepared via thermal oxidation and submitted to hydration in milliQ water. Surface analysis using SEM-EDS and XPS revealed that the hydrated MoO x film is composed of different oxidation states of Mo (Mo (IV), Mo (V) and Mo (VI)), influencing its electrochemical behavior. A hydration period of 45 days was required for the electrode to achieve a response approaching the Nernstian model (-58 mV/pH), while extended hydration of up to 70 days enhanced its stability and sensitivity. The electrode's performance was assessed under various conditions, including in the presence and absence of oxygen and in anaerobic conditions with the presence of sulfides. Oxygen absence increased sensitivity and lowered the experimental standard potential (E 0 Exp ) due to the effect of oxygen vacancies. Low sulfide concentrations had minimal impact on electrode performance, although higher concentrations may slightly decrease the electron transfer efficiency due to the complex formation. The pH sensing mechanisms of MoO x electrodes are also discussed. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.3390/s25030611 |
| الاتاحة: | https://brgm.hal.science/hal-04918447 https://brgm.hal.science/hal-04918447v1/document https://brgm.hal.science/hal-04918447v1/file/sensors-25-00611-v2.pdf https://doi.org/10.3390/s25030611 |
| Rights: | http://creativecommons.org/licenses/by/ ; info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.63EAD7FA |
| قاعدة البيانات: | BASE |
| DOI: | 10.3390/s25030611 |
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