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首页> 外文期刊>Journal of power sources >Pudding-typed cobalt sulfidesitrogen and sulfur dual-doped hollow carbon spheres as a highly efficient and stable oxygen reduction electrocatalyst
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Pudding-typed cobalt sulfidesitrogen and sulfur dual-doped hollow carbon spheres as a highly efficient and stable oxygen reduction electrocatalyst

机译：布丁型硫化钴/氮和硫双掺杂空心碳球，是高效，稳定的氧还原电催化剂

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摘要

Metal organic frameworks (MOFs) are rarely reported to be grown at the templates due to the strong inherent driving force for crystallization. Herein, we report a pathway to successfully synthesize Zeolitic imidazolate framework-67 (ZIF-67) grown at the unmodified SiO2 spheres from amorphous precursors, and further construct Pudding-typed electrocatalysts, where cobalt sulfides (CoSx) nanocrystals are embedded into nitrogen and sulfur dual-doped hollow carbon spheres (N, S-HCS). CoSx/N, S-HCS show good catalytic activity toward the oxygen reduction reaction (ORR), and the optimized performance is achieved with (CoSx/N, S-HCS)(700)with the positive half-wave potentials of 0.90 V vs RHE, high selectivity, good long-term stability, and excellent tolerance against methanol-crossover effect in alkaline medium, which are even superior to that of the as-reported MOFs-derived catalysts and commercial Pt/C catalysts. The remarkable catalytic performance is originated from high reactivity of catalytic active sites composed of cobalt sulfides and nitrogen and sulfur dual-doped carbon matrices, and Pudding-typed hollow structure with proper graphitization degree to facilitate fast electron and ion transport and limit the dissolution and agglomeration of active sites during long-term operation. (C) 2017 Elsevier B.V. All rights reserved.
机译：由于强大的内在结晶驱动力，金属有机骨架（MOF）很少在模板上生长。在本文中，我们报告了从非晶态前体成功合成在未改性SiO2球上生长的沸石咪唑盐骨架67（ZIF-67）的途径，并进一步构建了布丁型电催化剂，其中硫化钴（CoSx）纳米晶体嵌入氮和硫中双掺杂空心碳球（N，S-HCS）。 CoSx / N，S-HCS对氧还原反应（ORR）表现出良好的催化活性，（CoSx / N，S-HCS）（700）的正半波电势为0.90 V vs. RHE，高选择性，良好的长期稳定性以及对碱性介质中甲醇交叉作用的优异耐受性，甚至优于已报道的源自MOFs的催化剂和市售Pt / C催化剂。出色的催化性能源于由硫化钴和氮硫双掺杂碳矩阵组成的催化活性位的高反应性，以及具有适当石墨化度的布丁型空心结构，可促进电子和离子的快速迁移并限制溶解和团聚长期运行期间的活动站点数量。 （C）2017 Elsevier B.V.保留所有权利。

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  • 来源
    《Journal of power sources》 |2017年第30期|183-192|共10页
  • 作者

    Xiao Junwu; Zhao Chen; Hu Chencheng; Xi Jiangbo; Wang Shuai;

  • 作者单位

    Huazhong Univ Sci & Technol, Dept Chem & Chem Engn, Key Lab Mat Chem Energy Convers & Storage, Minist Educ,Hubei Key Lab Mat Chem & Serv Failure, Wuhan, Peoples R China;

    Huazhong Univ Sci & Technol, Dept Chem & Chem Engn, Key Lab Mat Chem Energy Convers & Storage, Minist Educ,Hubei Key Lab Mat Chem & Serv Failure, Wuhan, Peoples R China;

    Huazhong Univ Sci & Technol, Dept Chem & Chem Engn, Key Lab Mat Chem Energy Convers & Storage, Minist Educ,Hubei Key Lab Mat Chem & Serv Failure, Wuhan, Peoples R China;

    Wuhan Inst Technol, Sch Chem & Environm Engn, Wuhan, Peoples R China;

    Huazhong Univ Sci & Technol, Dept Chem & Chem Engn, Key Lab Mat Chem Energy Convers & Storage, Minist Educ,Hubei Key Lab Mat Chem & Serv Failure, Wuhan, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Metal-organic frameworks; Amorphous phase; Pudding-typed structure; Nitrogen and sulfur dual-doped carbon; Electro-catalysis;

    机译：金属有机骨架;非晶相;布丁型结构;氮硫双掺杂碳;电催化;催化;

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