Influence of calcination temperature of IrO2/Ti electrodes on oxygen reduction

Chia Chin Chang, Ten Chin Wen, Chien Hsin Yang, Yung Der Juang

研究成果: Article同行評審

16 引文 斯高帕斯(Scopus)

摘要

IrO2-coated titanium plate electrocatalysts prepared by a dip-coating method (IrO2/Ti) with different calcination temperatures are characterized by scanning electron microscope, X-ray diffraction and X-ray photoelectron spectroscopy. The electrocatalytic behavior of the oxygen reduction reaction (ORR) is evaluated by cyclic voltammetry and galvanostatic electrolysis in 1 mol dm-3 KOH solution. The effects of calcination temperature on the oxygen reduction pathway are examined. Galvanostatic electrolysis results show that the reaction pathway on the IrO2/Ti electrode prepared at high calcination temperature is mainly a two-electron pathway producing H2O2. It is observed that higher calcination temperatures produce: a more uniform fault-free surface; reduced levels of Cl contamination (residual Cl presumably from incomplete IrCl3 decomposition during the coating process); higher levels of rutile character of the IrO2 layer; lower hydration levels. It is confirmed that ORR electrocatalytic behavior on highly hydrated IrO2 is better than on slightly hydrated IrO2.

原文English
頁(從 - 到)93-97
頁數5
期刊Materials Chemistry and Physics
115
發行號1
DOIs
出版狀態Published - 2009 5月 15

All Science Journal Classification (ASJC) codes

  • 一般材料科學
  • 凝聚態物理學

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