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Title: Influence of substitution of Ru on the electrocatalytic properties of the perovskite-type LaSrNiO₄ electrode towards methanol oxidation
Authors: Singh, R N
Singh, A
Mishra, D
Tiwari, S K
Gunjan, M K
Issue Date: Aug-2008
Publisher: CSIR
IPC CodeInt. Cl. ⁸ B01J23/46; B01J23/755; H01M486/00; H01M4/92
Abstract: Ru-substituted perovskite oxides with molecular formulae LaSrNi₁₋xRuxO₄ (0.1 ≤ x ≤ 0.5) have been obtained by a modified, citric acid sol-gel route at 600ºC for their possible use as anodes in a direct methanol fuel cell (DMFC). These oxides have been as film on a nickel support and investigated for electrocatalysis of methanol oxidation in 1M KOH using XRD, SEM, cyclic voltammetry, chronoamperometry, impedance and Tafel polarization. The study shows that 0.2-0.5 mol Ru substitutions improve the apparent electrocatalytic activity of the oxide towards electrooxidation of methanol; the observed improvement being the greatest (~ 80% at E = 0.55 V versus Hg/HgO) with 0.2 mol Ru substitution. During a chronoamperometric study of 5 h at E = 0.5 V in 1M KOH + 1M CH₃OH, the Ru-substituted electrodes did not indicate any poisoning by the methanol oxidation intermediates/products. The methanol electrooxidation reaction follows a Tafel slope of ~ 40 mV decade⁻¹ and the order with respect to [OH⁻] is `~ 2 on each electrocatalyst, regardless of the Ru content.
Page(s): 1187-1193
ISSN: 0376-4710
Source:IJC-A Vol.47A(08) [August 2008]

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