An improved method of preparing iridium oxide electrode based on carbonate-melt oxidation mechanism

Pan, Yiwen; Sun, Zhentao; He, Hangqi; Li, Yifan; You, Lixin; Zheng, Hao

doi:10.1016/j.snb.2018.01.069

Cited by 25 publications

(32 citation statements)

References 38 publications

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“…Thereafter, the carbonate was removed using dilute HCl to obtain a wire coated with a black iridium oxide layer [106] . In another study, an IrO x electrode was prepared from a metallic iridium bar [107] . In this case, an iridium bar was placed in a mixed powder of Li 2 CO 3 and Na 2 O 2 and heated at elevated temperatures to convert it to IrO x [107] .…”

Section: Melt Methodsmentioning

confidence: 99%

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Iridium oxide fabrication and application: A review

Jang

Lee

2020

Journal of Energy Chemistry

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Section: Melt Methodsmentioning

confidence: 99%

“…In another study, an IrO x electrode was prepared from a metallic iridium bar [107] . In this case, an iridium bar was placed in a mixed powder of Li 2 CO 3 and Na 2 O 2 and heated at elevated temperatures to convert it to IrO x [107] .…”

Section: Melt Methodsmentioning

confidence: 99%

Iridium oxide fabrication and application: A review

Jang

Lee

2020

Journal of Energy Chemistry

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“…Note that the E-pH relationships obtained by our method are satisfactory and superior to other previously reported relationships. (1,2,36) This may be ascribed to the suitable heat treatment conditions resulting in an appropriate composition of the surface IrO x film.…”

Section: E-ph Response Of the Fabricated Iro X Electrodesmentioning

confidence: 99%

“…Despite these disadvantages, the reproducibility of the E-pH sensitivity of the fabricated electrodes is achievable. Pan et al (36) improved this carbonate melt oxidation method by adding sodium peroxide (Na 2 O 2 ) powder into a Li 2 CO 3 melt, resulting in good linearity in the pH range of 2-10 with good stability for 48 h. There have been few reports of IrO x electrodes with long-term stability, which is their key drawback. Our group proposed a new isothermal heat treatment and quenching process to further improve the performance of IrO x electrodes.…”

Section: Introductionmentioning

confidence: 99%

Insight into the Factors of Thermal Oxidation Influencing Properties of Iridium Oxide Electrodes

Huang¹,

Bi²,

Wan³

et al. 2020

Sensors and Materials

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Using thermal oxidation for fabricating iridium oxide (IrO x) electrodes is a good choice for obtaining robust pH electrodes. We fabricated IrO x electrodes at different temperatures for different heating times to obtain electrodes with different E (electrode potential)-pH responses, response rates, and long-term stability. Corresponding characterizations, which include surface morphology, section morphology and composition, surface composition, and surface roughness, are examined intensively. Scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and X-ray photoelectron spectroscopy (XPS) are used to carry out the characterizations. All prepared electrodes had a near-Nernstian response, especially when heated at 750, 800, and 870 ℃ for 1.0 and 1.5 h. IrO x electrodes fabricated with these heat treatment parameters had a relatively high response speed, a small potential drift, few cracks on the surface oxide film, thick films, and a small reaction impedance. The surface roughness and composition of the IrO x electrodes fabricated at different temperatures for 1.5 h were also obtained to clarify the relationship between the electrode composition, structure, and properties. Finally, the properties of the electrodes and their relationship with technical preparation parameters and the electrode structure and composition are discussed.

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“…In recent years, researchers have been working on the development of novel pH microsensors, in the context of which metal/metal oxide electrodes have received more and more attention. Among these metal oxide electrode materials, iridium and its oxides have attracted the most attention because they have advantages in processing, micromanipulation, wide test range, rapid response time, and good biocompatibility [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. These characteristics make it suitable for extreme environments and in vivo pH measurement.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Iridium Oxide pH Microelectrodes Based on Sputter Deposition Method

Guo

Wang

et al. 2021

Sensors

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pH value plays an important role in many fields such as chemistry and biology; therefore, rapid and accurate pH measurement is very important. Because of its advantages in preparation, wide test range, rapid response, and good biocompatibility, iridium oxide material has received more and more attention. In this paper, we present a method for preparing iridium oxide pH microelectrodes based on the sputter deposition method. The sputtering parameters of iridium oxide are also studied and optimized. Open-circuit potential tests show that microelectrodes exhibit near-Nernstian pH response with good linearity (about 60 mV/pH), fast response, high stability (a slight periodic fluctuation of potential change <2.5 mV in 24 h), and good reversibility in the pH range of 1.00–13.00.

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An improved method of preparing iridium oxide electrode based on carbonate-melt oxidation mechanism

Cited by 25 publications

References 38 publications

Iridium oxide fabrication and application: A review

Iridium oxide fabrication and application: A review

Insight into the Factors of Thermal Oxidation Influencing Properties of Iridium Oxide Electrodes

Fabrication and Characterization of Iridium Oxide pH Microelectrodes Based on Sputter Deposition Method

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