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首页> 外文期刊>Chemistry: A European journal >Graphene/Group 5 Transition Metal Dichalcogenide Composites for Electrochemical Applications
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Graphene/Group 5 Transition Metal Dichalcogenide Composites for Electrochemical Applications

机译：石墨烯/第5组过渡金属二均致原晶二孔复合材料，用于电化学应用

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摘要

In comparison to the extensive research and great success attained by Group 6 transition metal dichalcogenides (TMDs) as hydrogen evolution reaction (HER) electrocatalysts, there is limited research focused on metallic Group 5 TMDs for use as electrocatalysts for hydrogen evolution. Density functional theory calculations have pointed out that Group 5 TMDs are highly favorable for HER, especially vanadium disulfide. In this work, nanocomposites of graphene and Group 5 TMDs were synthesized by thermal exfoliation of graphene oxide/TMD precursors in an H_2S atmosphere or in a H_2 atmosphere as a control. Graphene oxide was prepared by the Hummers method while vanadium tetrachloride, niobium pentachloride, and tantalum pentachloride were utilized as TMD precursors. Then the potential of these nanocomposites as electrocatalysts towards HER was explored. Although these nanocomposites do not have comparable HER performance to Group6 TMDs, they exhibit higher electrocatalytic activity in comparison with thermally reduced graphene oxide (TRGO) in the absence of TMD modification. In addition, the capacitive performance of these materials was also investigated in consideration of the high capacitance of graphene. It was indicated that the presence of TMDs on graphene actually suppress the capacitance performance of graphene itself.
机译：与第6组过渡金属二甲硅藻（TMDS）获得的广泛研究和巨大成功作为氢进化反应（她的）电催化剂，研究了有限的研究，重点用于金属基团5 TMD，用作氢气催化剂的电催化剂。密度函数理论计算已经指出，第5组TMDS对她的尤其是钒二硫化物非常有利。在这项工作中，通过在H_2S大气中的石墨烯氧化物/ TMD前体的热剥离或在H_2大气中作为对照，通过纳米烯氧化物/ TMD前体进行纳米复合材料。石墨烯通过湿摩尔方法制备，而四氯化钒，五氯化铌和钽五氯化菊酯用作TMD前体。然后探讨了这些纳米复合材料的潜力作为对她的电催化剂。虽然这些纳米复合材料与组6 TMDS的性能没有相当的性能，但是在没有TMD改性的情况下，它们表现出更高的电催化活性。此外，考虑到石墨烯的高电容，还研究了这些材料的电容性能。结果表明，石墨烯的TMDS的存在实际上抑制了石墨烯本身的电容性能。

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  • 来源
    《Chemistry: A European journal》 |2017年第43期|共8页
  • 作者

    Yong Wang; Zden?k Sofer; Jan Luxa; Xinyi Chia; Martin Pumera;

  • 作者单位

    Division of Chemistry and Biological Chemistry School of Physical and Mathematical Science Nanyang Technological University 21 Nanyang Link 637371 Singapore (Singapore);

    Department of Inorganic Chemistry University of Chemistry and Technology Prague Technicka 5 166 28 Prague 6 (Czech Republic);

    Department of Inorganic Chemistry University of Chemistry and Technology Prague Technicka 5 166 28 Prague 6 (Czech Republic);

    Division of Chemistry and Biological Chemistry School of Physical and Mathematical Science Nanyang Technological University 21 Nanyang Link 637371 Singapore (Singapore);

    Division of Chemistry and Biological Chemistry School of Physical and Mathematical Science Nanyang Technological University 21 Nanyang Link 637371 Singapore (Singapore);

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 应用化学;
  • 关键词

    capacitance; composite; graphene; HER; TMDs;

    机译：电容;复合;石墨烯;她;TMDS;

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