Effect of precursor baking on the electrochemical properties of IrO2-Ta2O5/Ti anodes

Ching An Huang*, Shu Wei Yang, Po Liang Lai

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

12 Scopus citations

Abstract

IrO2-Ta2O5/Ti anodes were thermally pretreated by means of baking and continuous heating, and then thermal decomposition at 450 °C for 30 min. To prepare an IrO2-Ta2O5/Ti anode, a Ti substrate was dipped in the precursor, baked at 80 or 90 °C for different periods, and then thermally decomposed at 450 °C for 30 min in the air furnace. The electrochemical properties of prepared IrO2-Ta2O5/Ti anodes were evaluated through their voltammetric charges measured in the 1 M H2SO4 solution and their performance lives tested with 2 Acm−2 in the 1 M H2SO4 + 0.5 M Na2SO4 solution. Microstructures of prepared IrO2-Ta2O5/Ti anodes were characterized with x-ray diffractometer. The chemical compositions and surface morphologies of prepared IrO2-Ta2O5/Ti anodes were analyzed with scanning electron microscope equipped with energy-dispersive x-ray spectrometer. Based on the results of x-ray diffraction, only IrO2-diffracted peaks were detected from prepared IrO2-Ta2O5/Ti anodes. A mud-crack surface structure was seen from prepared IrO2-Ta2O5 coatings. The crack density and the crack width of an IrO2-Ta2O5 coating were obviously affected by different thermal pretreatments of baking methods and heating rates. The crack width of IrO2-Ta2O5 coating increased with an increasing the baking time. A relatively high voltammetric charge can be found from the IrO2-Ta2O5/Ti anode with wide cracks and high crack density. On the other hand, long lifetime values were detected from the IrO2-Ta2O5/Ti anode with a crack width more than 2 μm. The highest voltammetric charge was detected from the IrO2-Ta2O5/Ti anode prepared through baking at 90 °C for 180 s. On the other hand, the longest lifetime was found from the IrO2-Ta2O5/Ti anode pretreated with continuous heating at a rate of 7 °C/min.

Original languageEnglish
Pages (from-to)896-903
Number of pages8
JournalSurface and Coatings Technology
Volume350
DOIs
StatePublished - 25 09 2018

Bibliographical note

Publisher Copyright:
© 2018 Elsevier B.V.

Keywords

  • Crack density
  • Crack width
  • IrO-TaO/Ti anode
  • Performance life
  • Voltammetric charge

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