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Title: Electrocatalytic properties of Sr-doped LaMnO3 obtained by a new sol-gel route in relation to O2 evolution in alkaline solution
Authors: Lal, B
Singh, N K
Singh, R N
Issue Date: Dec-2001
Publisher: NISCAIR-CSIR, India
Abstract: Lanthanum manganites with molecular formula La1-xSrxMnO3 (0 x 0.5) have been synthesized in a powder form at 700°C using citric acid and ethylenediamine as gelling agents. These powders have been reproduced in the film forms on pretreated Ni-supports by an oxide-slurry painting technique. The study has indicated that Sr-substitution increased both the apparent as well as the true catalytic activity of the oxide and that it has no regular effect on the oxide roughness. The Tafel slope and the reaction order with respect to OH- concentrations at low overpotential have been observed to be approximately 2.3 × 2RT1F and unity, respectively. Sr-substitution seems to slightly decrease the apparent electrochemical activation energy (ΔHcl#0), while it has no effect on the true electrochemical activation energy (ΔHc#0) and on the entropy of activation (ΔS#0) of the reaction.
Page(s): 1269-1276
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.40A(12) [December 2001]

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