Renewable antimony-based pH sensor

Liu, Yaosheng; Diao, Yongxing; Hu, Gongcheng; Yang, Zhao; Shi, Yan; Wang, Hongda; Li, Zhuang

doi:10.1016/j.jelechem.2022.117085

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…By using the Nernst equation, we tacitly assume that the protolytic reactions at the f/s interface are in a state of equilibrium. In support of this assumption, we note that many metal/metal oxide electrodes [e.g., W/WO 3 , 12 Sb/Sb 2 O 3 , 13 Zr/ZrO 2 14) have been employed as pH sensors, displaying Nernstian or quasi-Nernstian pH responses. This means that in some metal oxide systems, the potential energy depends mainly on the pH of the solutions and the changes in the activities of species other than H+ ions can be ignored.…”

Section: Relationship Between Parameters α and βmentioning

confidence: 64%

Estimation of Some Parameters in the Point Defect Model (PDM) for the Passivity of Metals

Engelhardt,

Chen,

Dong

et al. 2024

J. Electrochem. Soc.

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In this paper, we justify that the potential drop at the barrier layer/solution (bl/s) interface of the barrier layer of the passive film on a metal, φ_(f/s), is a linear function of the applied voltage V and pH in the case of sufficiently thin barrier layer. Furthermore, we show that a relationship exists between parameters α (the dependence of φ_(f/s) on V) and β (the dependence of φ_(f/s) on pH), that is, those parameters are not independent, in the general case. It is also shown that some dependence of parameters α and β on temperature can exist. However, this dependence in the practical region (0 -100 oC) is weak and, in many cases, it is possible to neglect the dependence of parameters α and β on temperature. Finally, we show that it is possible to estimate, theoretically, the parameter β (and accordingly parameter α) by using models for specific systems. For the system considered in the current report (carbon steel in concrete pore water), the estimated value of parameter β is confirmed experimentally. These findings are discussed in terms of the electronic and point defect structures of the barrier layer.

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Section: Relationship Between Parameters α and βmentioning

confidence: 64%

Estimation of Some Parameters in the Point Defect Model (PDM) for the Passivity of Metals

Engelhardt,

Chen,

Dong

et al. 2024

J. Electrochem. Soc.

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“…The key performance metrics of the system developed here are compared with recent potentiometric [ 48 – 65 ] and voltammetric systems [ 19 , 66 – 72 ] in Table 3 . The electrode response of the LIG-Riboflavin electrode is sub-Nernstian at − 43 mV/pH which is in contrast to the − 59 mV/pH observed with solution-based riboflavin [ 21 , 36 , 42 ], and polymer bound flavin [ 19 ] and flavanone [ 72 ] derivatives.…”

Section: Resultsmentioning

confidence: 99%

Moving towards in pouch diagnostics for ostomy patients: exploiting the versatility of laser induced graphene sensors

McCann,

Gilpin,

Scott

et al. 2023

J Mater Sci

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The development of a 3D printed sensor for direct incorporation within stoma pouches is described. Laser induced graphene scribed on either side of polyimide film served as the basis of a 2 electrode configuration that could be integrated within a disposable pouch sensor for the periodic monitoring of ileostomy fluid pH. The graphene sensors were characterised using electron microscopy, Raman spectroscopy, DekTak profilometry with the electrochemical properties investigated using both cyclic and square wave voltammetry. Adsorbed riboflavin was employed as a biocompatible redox probe for the voltammetric measurement of pH. The variation in peak position with pH was found to be linear over pH 3–8 with a sub Nernstian response (43 mV/pH). The adsorbed probe was found to be reversible and exhibited minimal leaching through repeated scanning. The performance of the system was assessed in a heterogeneous bacterial fermentation mixture simulating ileostomy fluid with the pH recorded before and after 96 h incubation. The peak profile in the bacterial medium provided an unambiguous signal free from interference with the calculated pH before and after incubation (pH 5.3 to 3.66) in good agreement with that obtained with commercial pH probes. Graphical abstract

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“…Antimony has a long history as a pH electrode material and is currently one of the most studied electrode materials. 22–24 Compared with noble metals platinum and iridium, antimony is inexpensive and abundant. In addition, antimony-based electrodes are also suitable for harsh environments such as high temperature, high pressure and corrosive media.…”

Section: Introductionmentioning

confidence: 99%

Preparation and application of a Cu-doped antimony electrode to improve the performance of pH measurement in seawater

Li,

Zong,

et al. 2024

Analyst

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Renewable antimony-based pH sensor

Cited by 5 publications

References 22 publications

Estimation of Some Parameters in the Point Defect Model (PDM) for the Passivity of Metals

Estimation of Some Parameters in the Point Defect Model (PDM) for the Passivity of Metals

Moving towards in pouch diagnostics for ostomy patients: exploiting the versatility of laser induced graphene sensors

Preparation and application of a Cu-doped antimony electrode to improve the performance of pH measurement in seawater

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