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首页> 外文期刊>Materials Science and Engineering >Synthesis of PtSn nanostructured catalysts supported over TiO_2 and Ce-doped TiO_2 particles for the electro-oxidation of ethanol
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Synthesis of PtSn nanostructured catalysts supported over TiO_2 and Ce-doped TiO_2 particles for the electro-oxidation of ethanol

机译：TiO_2和Ce掺杂TiO_2负载载PtSn纳米结构催化剂的乙醇电氧化。

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摘要

PtSn/TiO2 and PtSn/Ce-doped TiO2 catalysts were synthesized and evaluated for ethanol electro-oxidation in acid media. Titanium dioxide and Ce-doped TiO2 nanopartides were prepared by hydrothermal method followed by calcination at 923 K. Bimetallic PtSn catalysts supported on the oxide materials were synthesized by microwave assisted reduction in ethylene glycol (EG). The structural properties of the resulting materials were evaluated via TEM and XRD, and the compositions were assessed by EDX and ICP-AES analysis. PtSn nanoparticles of about 3-4 nm were deposited on TiO2 and Ce-TiO2 particles. It was found that the catalyst composition is scarcely influenced by the cerium content in the mixed oxides while the electrochemical surface area per unit mass decreases upon the incorporation of Ce in the anatase lattice. The electrochemical tests pointed out that the electrocatalytic activity for ethanol oxidation decreases markedly as the Ce content increases. The results indicate that the presence of cerium in the titanium dioxide crystalline network induces local structural and electronic modifications, thereby leading to a reduction of the crystallinity, surface conductivity and the amount of OH species adsorbed on the surface of the oxide support.
机译：合成了PtSn / TiO2和PtSn / Ce掺杂的TiO2催化剂，并评估了在酸性介质中乙醇的电氧化。通过水热法制备二氧化钛和Ce掺杂的TiO2纳米粒子，然后在923 K下煅烧。通过微波辅助还原乙二醇（EG）合成负载在氧化物材料上的双金属PtSn催化剂。通过TEM和XRD评估所得材料的结构性质，并通过EDX和ICP-AES分析评估组成。约3-4 nm的PtSn纳米颗粒沉积在TiO2和Ce-TiO2颗粒上。已经发现，催化剂组合物几乎不受混合氧化物中铈含量的影响，而当在锐钛矿晶格中掺入Ce时，每单位质量的电化学表面积减小。电化学测试指出，随着Ce含量的增加，乙醇氧化的电催化活性显着降低。结果表明铈在二氧化钛晶体网络中的存在引起局部结构和电子修饰，从而导致结晶度，表面电导率和吸附在氧化物载体表面上的OH种类的量降低。

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  • 来源
    《Materials Science and Engineering》 |2016年第9期|26-32|共7页
  • 作者

    A.E. Alvarez; A.N. Gravina; J.M. Sieben; P.V. Messina; M.M.E. Duarte;

  • 作者单位

    Instituto de Ingenieria Electroquimica y Corrosion (INIEC), CONICET, Universidad Nacional del Sur. Av. Alem 1253, Bahia Blanca B8000CPB, Argentina;

    Departamento de Quimica, INQUISUR, CONICET, Universidad Nacional del Sur, Av. Alem 1253, Bahia Blanca B8000CPB, Argentina;

    Instituto de Ingenieria Electroquimica y Corrosion (INIEC), CONICET, Universidad Nacional del Sur. Av. Alem 1253, Bahia Blanca B8000CPB, Argentina;

    Departamento de Quimica, INQUISUR, CONICET, Universidad Nacional del Sur, Av. Alem 1253, Bahia Blanca B8000CPB, Argentina;

    Instituto de Ingenieria Electroquimica y Corrosion (INIEC), CONICET, Universidad Nacional del Sur. Av. Alem 1253, Bahia Blanca B8000CPB, Argentina;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Ce doping; Titanium dioxide support; PtSn nanopartides; Ethanol electro-oxidation;

    机译：铈掺杂;二氧化钛载体;PtSn纳米粒子;乙醇电氧化;

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