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首页> 外文期刊>Indian Journal of Chemistry, Section A. Inorganic, Physical, Theoretical & Analytical >Influence of substitution of Ru on the electrocatalytic properties of the perovskite-type LaSrNiO4 electrode towards methanol oxidation
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Influence of substitution of Ru on the electrocatalytic properties of the perovskite-type LaSrNiO4 electrode towards methanol oxidation

机译：Ru的取代对钙钛矿型LaSrNiO4电极对甲醇氧化的电催化性能的影响

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摘要

Ru-substituted perovskite oxides with molecular formulae LaSrNi_(1-x)Ru_xO4(0.1<=x<=0.5)have been obtained by a modified,citric acid sol-gel route at 600°C 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.
机译：分子式为LaSrNi_（1-x）Ru_xO4（0.1 <= x <= 0.5）的Ru取代钙钛矿氧化物已通过改性柠檬酸溶胶-凝胶路线在600°C下获得，可直接用作阳极这些氧化物已在镍载体上成膜，并通过XRD，SEM，循环伏安法，计时安培法，阻抗和Tafel极化研究了在1M KOH中甲醇氧化的电催化作用。研究表明，该氧化物的摩尔比为0.2-0.5 mol。 Ru取代提高了氧化物对甲醇电氧化的表观电催化活性;观察到的改进最大（在E = 0.55 V时相对于Hg / HgO约为80％），Ru取代为0.2 mol。在E历时5 h的计时电流研究中在1M KOH + 1M CH3OH中= 0.5 V时，Ru取代的电极未表明甲醇氧化中间体/产物有任何中毒。甲醇电氧化反应遵循〜40 mV十年的Tafel斜率（-1）且与关于[OH〜-]大约是2催化剂，不论钌含量如何。

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