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

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
JournalJournal of the Taiwan Institute of Chemical Engineers
DOIs
Publication statusAccepted/In press - 2021

Keywords

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

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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