The effect of ruthenium content on the stability and activity of Ti/RuO2-Sb2O5-SnO2 for oxygen evolution

Jiaying Li, Xusong Qin, Guanghao Chen, Guohua Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)

Abstract

The effects of ruthenium content on Ti/RuO2-Sb2O5-SnO2 anodes are investigated in terms of catalytic activity and stability for oxygen evolution. The best electrochemical stability appears at nominal Ru content around 30%, giving average accelerated lives of 419 and 165 h at 25 and 70 °C, respectively, under the current density of 500 mA cm−2 in 3 M H2SO4 solution. These values are respectively ~8 and >22 times longer than any types of RuO2-based electrodes reported previously. The electrocatalytic activity of Ti/RuO2-Sb2O5-SnO2 anodes is found to increase with nominal Ru content approaching 75%. The physicochemical and electrochemical analyses reveal that the homogeneous intermixture of RuO2, SnO2 and Sb2O5 with a smooth and compact surface decreases the dissolution rate of RuO2, leading to a significant improvement on the electrode service life. Despite the numerous pores and cracks found in the coating, Ti/RuO2-Sb2O5-SnO2 anode with a nominal Ru content of 75% exhibits better electrocatalytic performance for O2 evolution, which is attributed to more active RuO2 sites exposed to electrolyte. Therefore, the existence of the optimal Ru content for Ti/RuO2-Sb2O5-SnO2 is the balanced effect between electrochemical stability and activity for O2 evolution, as well as cost for specific applications.

Original languageEnglish
Pages (from-to)186-194
Number of pages9
JournalJournal of the Taiwan Institute of Chemical Engineers
Volume125
DOIs
Publication statusPublished - Aug 2021

Keywords

  • DSA
  • Electrochemical stability
  • Metal oxide coating
  • O evolution
  • Ru-based electro-catalyst

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering

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