Abstract
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 language | English |
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Pages (from-to) | 26 |
Number of pages | 1 |
Journal | Chinese Journal of Catalysis |
Volume | 21 |
Issue number | 1 |
State | Published - 2000 |
Externally published | Yes |
Keywords
- Electrocatalysis
- Oxygen evolution
- Perovskite