Degradation of Ir-Ta oxide coated Ti anodes in sulfuric acid solutions containing fluoride
Source abstract
Abstract
Abstract The lifetime of IrO2-Ta2O5 coated titanium anodes has been investigated using a galvanostatic accelerated life test (ALT) method in 2 M (2000 mol/m3) H2SO4 solutions containing fluoride. Fluoride addition in the concentration range of 25−200 ppm significantly reduces the lifetime of films through localized thinning and in some cases, complete removal of film. While the presence of fluoride does not affect the overpotential for oxygen evolution, it lowers the efficacy of oxygen evolution. Complexation of fluoride by aluminum ions reduces the deleterious effects of fluoride. Based on thermodynamic and XPS analyses, a degradation mechanism has been proposed.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Electron and X-Ray Spectroscopy Techniques · Semiconductor materials and devices · Advancements in Battery Materials
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References (18)
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1. Degradation mechanism of long service life Ti/IrO2-Ta2O5 oxide anodes in sulphuric acid10.1016/S0010-938X(01)00165-2 ↗
2. Influence of the preparation method on the morphological and electrochemical properties of Ti/IrO2-coated electrodes10.1016/S0013-4686(00)00508-9 ↗
3. Electrochemical and physical characterisation of lead-based anodes in comparison to Ti-(70%) IrO2/(30%) Ta2O5 dimensionally stable anodes for use in copper electrowinning10.1007/s10800-009-0044-7 ↗
4. A comparative study on IrO2-Ta2O5 coated titanium electrodes prepared with different methods10.1016/j.electacta.2008.10.004 ↗
5. A study on the deactivation of an IrO2-Ta2O5 coated titanium anode10.1016/S0010-938X(03)00108-2 ↗
6. Calcination temperature dependent catalytic activity and stability of IrO2 –Ta2O5 anodes for oxygen evolution reaction in aqueous sulfate electrolytes10.1149/2.0061710jes ↗
7. Stability of iridium oxide-tantalum oxide coated titanium electrodes for oxygen evolution in alkaline solutions
8. Energy-efficient electrowinning process with smart anode comprising nano-oxide catalyst
9. The role of hydrated oxides in formation and structure of DSA-type oxide electrocatalysts10.1016/0013-4686(95)00002-V ↗
10. X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopic characterization of IrO2+Ta2O5 films10.1039/ft9938901707 ↗
11. Huang · 2016
12. Specific interaction of ions10.1039/tf9555100747 ↗
13. The electrocatalytic activity of IrO2-Ta2O5 anode materials and electrolyzed oxidizing water preparation and sterilization effect10.1039/C4RA14671A ↗
14. Effect of coating thickness and surface treatment of titanium on the properties of IrO2-Ta2O5 anodes10.1007/BF00242194 ↗
15. A study on the performance of IrO2-Ta2O5 coated anodes with surface treated Ti substrates10.1016/j.electacta.2015.01.005 ↗
16. Investigation of surface morphology, structure and electrocatalytic properties for O2 evolution of titanium based IrO2-Ta2O5 coatings
17. Electrochemical surface characterization of IrO2-Ta2O5 coated titanium electrodes in Na2SO4 solution10.1149/1.1574033 ↗
18. “The X-ray photoelectron spectra of Ir, IrO2 and IrCl3 revisited10.1002/sia.6225 ↗