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首页> 外文期刊>Journal of Electroanalytical Chemistry: An International Journal Devoted to All Aspects of Electrode Kinetics, Interfacial Structure, Properties of Electrolytes, Colloid and Biological Electrochemistry >Kinetic study of formic acid oxidation on carbon-supported platinum electrocatalyst
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Kinetic study of formic acid oxidation on carbon-supported platinum electrocatalyst

机译：碳载铂电催化剂上甲酸氧化的动力学研究

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Oxidation of formic acid on the platinum catalyst supported on high area carbon was investigated by potent iodynamic and quasi-steady-state polarization measurements. It was found that the poisoning of the reaction occurred both in the hydrogen region and in the double-layer region, but poisons were formed faster at lower potentials. Kinetics of the reaction was consistent with the dual path mechanism. At lower potentials HCOOH was oxidized to CO, at the Pt sites uncovered by COads. If high coverage by the poisoning species was attained, the reaction reached the limiting current plateau and further increase of the Current densities started at the potential of COads oxidation. Kinetic parameters of the HCOOH oxidation suggested that the rate determining step was the transfer of the first electron from HCOOHads, which was adsorbed under the Temkin conditions, Oxidation of formic acid became pH-dependent reaction in the electrolytes of pH < 1 with the reaction order with respect to H+ ions of about - 0.8. (c) 2005 Elsevier B.V. All rights reserved.
机译：通过强电动力学和准稳态极化测量研究了甲酸在高面积碳负载的铂催化剂上的氧化。发现反应的中毒在氢区域和双层区域中均发生，但是在较低电势下形成毒物的速度更快。反应动力学与双路径机理一致。在较低的电位下，HCOOH在未被Coads覆盖的Pt部位被氧化为CO。如果中毒物质的覆盖率很高，则反应达到极限电流平台，电流密度的进一步增加始于COads氧化的电势。 HCOOH氧化的动力学参数表明，速率决定步骤是在Temkin条件下吸附的HCOOHads中的第一个电子转移，甲酸的氧化成为pH <1的电解质中pH依赖的反应，反应顺序为关于H +离子约为-0.8。 （c）2005 Elsevier B.V.保留所有权利。

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