Among various hydrogen evolution reaction (HER) catalysts, cobalt disulfide (CoS2) has attracted extensive attention due to its abundant sources, favorable electrical conductivity and electrocatalytic activity. Herein, CoS2-embedded nitrogen-doping carbon nanotubes with hollow polyhedron (CoS2/NCNHP) derived from ZIF-8@ZIF-67 was synthesized and functioned as an HER electrocatalyst. Carbon materials from the pyrolysis of ZIF-8@ZIF-67 effectively retained porous structures of the zeolitic imidazolate frameworks, resulting in a high specific surface area to provide a carrier for the loading of the CoS2 nanoparticles, while the generation of N-doped carbon nanotubes (NCNTs) further enhanced the electrical conductivity of the substrate. In addition, the favorable electrochemical properties were facilitated by the synergistic effect between CoS2 and NCNTs. Therefore, the material, CoS2/NCNHP, was electrochemically tested under acidic conditions, showing the overpotential was only 144 mV at the current density of 100 mA center dot cm(-2), and the current density remained 89.6 after a long electrolysis period of 24 h. The synthetic strategy for the controlled design of MOF-derived materials affords a new pathway in developing commercial electrocatalysts. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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机译:在各种析氢反应(HER)催化剂中,二硫化钴(CoS2)因其来源丰富、导电性和电催化活性等优点而受到广泛关注。本文合成了由ZIF-8@ZIF-67衍生的CoS2包埋的空心多面体氮掺杂碳纳米管(CoS2/NCNHP),并将其用作HER电催化剂。ZIF-8@ZIF-67热解产生的碳材料有效地保留了沸石咪唑酸盐骨架的多孔结构,从而产生了高比表面积,为CoS2纳米颗粒的负载提供了载体,而N掺杂碳纳米管(NCNTs)的生成进一步增强了基底的电导率。此外,CoS2和NCNTs之间的协同作用促进了良好的电化学性能。因此,在酸性条件下对CoS2/NCNHP材料进行了电化学测试,结果表明,在100 mA中心点cm(-2)的电流密度下,过电位仅为144 mV,经过24 h的长电解时间后,电流密度仍保持在89.6%。MOF衍生材料的可控设计的合成策略为开发商业电催化剂提供了新的途径。(c) 2022 Hydrogen Energy Publications LLC.,由爱思唯尔有限公司出版。保留所有权利。
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