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首页> 外文期刊>International Journal of Electrochemical Science >Temperature Effect on the Electrooxidation of Gamma Hydroxybutyric Acid (GHB) on Platinum Catalyst through Cyclic Voltammetry, Chronoamperometry, Impedance Spectroscopy and SERS Spectroelectrochemistry
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Temperature Effect on the Electrooxidation of Gamma Hydroxybutyric Acid (GHB) on Platinum Catalyst through Cyclic Voltammetry, Chronoamperometry, Impedance Spectroscopy and SERS Spectroelectrochemistry

机译：循环伏安法，计时安培法，阻抗谱和SERS光谱电化学对铂催化剂上γ-羟基丁酸（GHB）电氧化的温度影响

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A study of the electro-oxidation of gamma hydroxybutyric acid (GHB) on platinum electrode in acidicmedia has been investigated by cyclic voltammetry, chronoamperometry and electrochemicalimpedance spectroscopy in the temperature range between 5 and 30C. The variation of the j-E curvesallows the determination of activation energy in a wide interval of potentials where three characteristicoxidation peaks appear. The j-t curves were registered at the more positive potentials correspondingwith the A and B peaks. Stationary current intensity measurements allowed the determination of theactivation energy in pure kinetic region conditions. Electrochemical impedance spectroscopy madealso possible the study of the electrochemical behavior in the same potential region. Temperaturedependence of the charge-transfer resistance (Rct) and the rate constant associated with the surface-1 coverage by an adsorbed intermediate (=Ro/L) during the GHB electro-oxidation process wereevaluated and discussed. In all cases, the values of activation energy, below 30 kJ/mol, suggest that acomplex mechanism takes place for the GHB electro-oxidation free of strong interactions with theplatinum surface. In situ Surface Enhanced Raman Scattering (SERS) spectroelectrochemistry spectracorresponding to coadsorbed species, including intermediates of reaction, have been analyzed atseveral potentials.
机译：通过循环伏安法，计时安培法和电化学阻抗谱在5至30℃的温度范围内，研究了在酸性介质中铂电极上γ-羟基丁酸（GHB）的电氧化研究。 j-E曲线的变化允许确定在宽的电位间隔中的活化能，其中存在三个特征性的氧化峰。 j-t曲线在与A和B峰相对应的更正电位处记录。静态电流强度测量允许确定纯动力学区域条件下的活化能。电化学阻抗谱也使研究相同电位区域的电化学行为成为可能。评估和讨论了在GHB电氧化过程中，电荷转移电阻（Rct）的温度依赖性以及与被吸附的中间体的表面1覆盖相关的速率常数（= Ro / L）。在所有情况下，低于30 kJ / mol的活化能值表明，GHB电氧化发生了复杂的机制，而没有与铂表面的强烈相互作用。原位表面增强拉曼散射（SERS）光谱电化学光谱与共吸附物质（包括反应中间体）相对应，已在几种电势下进行了分析。

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