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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Efficient catalyst of defective CeO2-x and few-layer carbon hybrid for oxygen reduction reaction
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Efficient catalyst of defective CeO2-x and few-layer carbon hybrid for oxygen reduction reaction

机译：有缺陷的CeO2-x和多层碳杂化物的高效催化剂用于氧还原反应

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摘要

CeO2 nanomaterials are widely used as excellent catalysts for CO oxidation, tail gas purification and gas reforming, but they are rarely used in the oxygen reduction reaction (ORR). Here, a hybrid of few-layer carbon encapsulated defect-rich CeO2-x (CeO2-x@C), which was prepared by an direct-current arc-discharge process, is presented as a new efficient ORR catalyst. The defective structure of CeO2-x, involving oxygen vacancies and the presence of Ce3+, plays an important role on the ORR catalysis. Our CeO2-x@C achieves more positive onset potential (similar to 0.74 V), larger limited current density (similar to 6 mA cm(-2)) and an electron transfer number of similar to 4, compared to the non-defective CeO2-carbon hybrid. Compared to the sample prepared via hydrothermal method, the CeO2-x derived from arc-discharge process has more uniform structure with surfactant-free surface, which may also contribute to the high ORR activity. Besides good ORR activity, our CeO2-x@C also shows excellent stability and good resistance to methanol crossover effects. (C) 2016 Published by Elsevier B.V.
机译：CeO2纳米材料被广泛用作CO氧化，尾气净化和气体重整的出色催化剂，但很少用于氧还原反应（ORR）中。在此，提出了一种通过直流电弧放电工艺制备的多层低碳包封的富缺陷CeO2-x（CeO2-x @ C）的混合物，作为一种新型的高效ORR催化剂。 CeO2-x的缺陷结构，包括氧空位和Ce3 +的存在，在ORR催化中起重要作用。与无缺陷的CeO2相比，我们的CeO2-x @ C实现了更高的正起始电位（约0.74 V），更大的受限电流密度（约6 mA cm（-2））和电子转移数接近4。 -碳混合动力车。与通过水热法制备的样品相比，电弧放电法制得的CeO2-x具有更均匀的结构和无表面活性剂的表面，这也可能有助于高ORR活性。除了具有良好的ORR活性外，我们的CeO2-x @ C还显示出出色的稳定性和对甲醇穿越效果的良好抵抗力。 （C）2016由Elsevier B.V.发布

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