Electrocatalysis of oxygen evolution on La1 - XSrxCoO3 perovskites in alkaline solution

Peng Wang, Liguang Yao, Mingxian Wang, Weitao Wu

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2 Scopus citations


La1 - xSrxCoO3 series perovskites were synthesized by tartaric acid-aided method at moderate temperature. XRD patterns were taken for each sample to confirm the compound concerned. The surface area of electrodes was determined by double-layer charging curves, using the cyclic voltammetry technique. A kinetic study of the oxygen evolution on these electrodes in KOH solution was made by Tafel polarization technique. The steady-state polarization results indicated that the Tafel slope of oxygen evolution on La1 - xSrxCoO3 electrodes is 2.303RT/F and the reaction order with respect to OH- is close to unity. The electrochemical desorption of OH- is the rate-determining step for the oxygen evolution reaction. The roughness factor of oxides increases with the increase of x in La1 - xSrxCoO3. The activation energy of oxygen evolution reaction on La1 - xSrxCoO3 with x = 0.2 is the lowest, i.e. the electrocatalytic activity of La0.8Sr0.2CoO3 is the highest among all the perovskites.

Original languageEnglish
Pages (from-to)26
Number of pages1
JournalChinese Journal of Catalysis
Issue number1
StatePublished - 2000
Externally publishedYes


  • Electrocatalysis
  • Oxygen evolution
  • Perovskite


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