Oxygen reduction reaction activity of la-based perovskite oxides in alkaline medium: A thin-film rotating ring-disk electrode study

Sunarso, Jaka, Torriero, Angel A. J., Zhou, Wei, Howlett, Patrick C. and Forsyth, Maria (2012) Oxygen reduction reaction activity of la-based perovskite oxides in alkaline medium: A thin-film rotating ring-disk electrode study. Journal of Physical Chemistry C, 116 9: 5827-5834. doi:10.1021/jp211946n


Author Sunarso, Jaka
Torriero, Angel A. J.
Zhou, Wei
Howlett, Patrick C.
Forsyth, Maria
Title Oxygen reduction reaction activity of la-based perovskite oxides in alkaline medium: A thin-film rotating ring-disk electrode study
Journal name Journal of Physical Chemistry C   Check publisher's open access policy
ISSN 1932-7447
1932-7455
Publication date 2012-03-01
Sub-type Article (original research)
DOI 10.1021/jp211946n
Volume 116
Issue 9
Start page 5827
End page 5834
Total pages 8
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Formatted abstract
In this work, LaMO 3 and LaNi 0.5M 0.5O 3 (M = Ni, Co, Fe, Mn and Cr) perovskite oxide electrocatalysts were synthesized by a combined ethylenediaminetetraacetic acid-citrate complexation technique and subsequent calcinations at 1000 °C in air. Their powder X-ray diffraction patterns demonstrate the formation of a specific crystalline structure for each composition. The catalytic property of these materials toward the oxygen reduction reaction (ORR) was studied in alkaline potassium hydroxide solution using the rotating disk and rotating ring-disk electrode techniques. Carbon is considered to be a crucial additive component because its addition into perovskite oxide leads to optimized ORR current density. For LaMO 3 (M = Ni, Co, Fe, Mn and Cr)), in terms of the ORR current densities, the performance is enhanced in the order of LaCrO 3, LaFeO 3, LaNiO 3, LaMnO 3, and LaCoO 3. For LaNi 0.5M 0.5O 3, the ORR current performance is enhanced in the order of LaNi 0.5Fe 0.5O 3, LaNi 0.5Co 0.5O 3, LaNi 0.5Cr 0.5O 3, and LaNi 0.5Mn 0.5O 3. Overall, LaCoO 3 demonstrates the best performance. Most notably, substituting half of the nickel with cobalt, iron, manganese, or chromium translates the ORR to a more positive onset potential, suggesting the beneficial catalytic effect of two transition metal cations with Mn as the most promising candidate. Koutecky-Levich analysis on the ORR current densities of all compositions indicates that the four-electron pathway is favored on these oxides, which are consistent with hydroperoxide ion formation of <2%.
Keyword Fuel-Cells
Electrocatalysts
Catalysts
Nanoparticles
Batteries
Alloy
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Publication Date (Web): 9 February 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2013 Collection
 
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