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首页> 外文期刊>Electrocatalysis >Impedance Spectroscopy and Catalytic Activity Characterization of a La_(0.85)Sr_(0.15)MnO3/Ce_(0.9)Gd_(0.1)O_(1.95) Electrochemical Reactor for the Oxidation of Propene
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Impedance Spectroscopy and Catalytic Activity Characterization of a La_(0.85)Sr_(0.15)MnO3/Ce_(0.9)Gd_(0.1)O_(1.95) Electrochemical Reactor for the Oxidation of Propene

机译：La_（0.85）Sr_（0.15）MnO3 / Ce_（0.9）Gd_（0.1）O_（1.95）电化学反应器氧化丙烯的阻抗谱和催化活性表征

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摘要

This study aims to characterize the catalytic and electrochemical behavior of a La_(0.85)Sr_(0.15)MnO3/Ce_(0.9)Gd_(0.1)O_(1.95) porous reactor for the oxidation of propene in the presence of oxygen. The application of anodic polarization strongly increased the propene oxidation rate up to 71 %, although the current efficiency remained low. The effect of prolonged polarization on the reactor catalytic activity was evaluated. Prolonged polarization enhanced both the reactor intrinsic catalytic activity and the electrode performance due to the formation of oxygen vacancies on the electrode surface. Electrochemical impedance spectroscopy was used to investigate the effect of propene introduction on the reactor impedance response. The introduction of propene into reactive system caused a strong increase of electrode resistance, mainly located in the low-frequency region of the impedance spectrum. This effect was caused by the strong adsorption of propene on electrode surfaces inhibiting the adsorption and dissociation of oxygen.
机译：这项研究旨在表征La_（0.85）Sr_（0.15）MnO3 / Ce_（0.9）Gd_（0.1）O_（1.95）多孔反应器在氧气存在下氧化丙烯的催化和电化学行为。尽管电流效率仍然很低，但是阳极极化的应用极大地提高了丙烯的氧化率，达到了71％。评价了延长极化对反应器催化活性的影响。由于在电极表面形成氧空位，延长的极化增强了反应器的固有催化活性和电极性能。电化学阻抗谱用于研究丙烯引入对反应器阻抗响应的影响。丙烯引入反应体系后，电极电阻大大增加，主要位于阻抗谱的低频区域。这种作用是由于丙烯在电极表面上的强烈吸附抑制了氧气的吸附和解离。

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