Construction of strawberry-like Ni3S2@Co9S8 heteronanoparticle-embedded biomass-derived 3D N-doped hierarchical porous carbon for ultrahigh energy density supercapacitors
Construction of strawberry-like Ni3S2@Co9S8 heteronanoparticle-embedded biomass-derived 3D N-doped hierarchical porous carbon for ultrahigh energy density supercapacitors
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用于超高能量密度超级电容器的草莓状Ni3S2@Co9S8嵌入异质纳米颗粒的生物质衍生的3D N掺杂分级多孔碳的构建
DOI：
10.1039/c9ta05145g
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发表时间：
2019-08-07
影响因子：
11.9
通讯作者：
An, Qingda
中科院分区：
文献类型：
--
作者：
Wang, Shifu;Xiao, Zuoyi;An, Qingda
高级超级电容器的设计需要将高表面积与发达的分级多孔结构结合的联合收割机电极材料，以促进离子传输和电解质渗透性。在此，我们报告了一种交联和原位硫化策略，用于合成硫化镍（Ni 3S 2）纳米晶附着的硫化钴（Co 9 S8）封装在三维（3D）N掺杂的分级多孔碳（Ni3S2@Co9S8/N-HPC）上。使用不同的表征技术对Ni3S2@Co9S8/N-HPC复合材料进行了广泛的研究。结果表明，所获得的材料综合了开发的N掺杂碳骨架（快速离子传输和优异的导电性）和过渡金属硫化物物种（高理论比电容）的优点。得益于草莓状Ni3S2@Co9S8结构和三维互联分级多孔碳的协同效应，在0.5 A g（-1）的电流密度下，Ni3S2@Co9S8/N-HPC复合材料的比容量为1970.5 F g（-1），循环稳定性良好，电容保持率为89.5%在10 A g（-1）下5000次循环后。此外，在6 M KOH电解质中组装Ni3S2@Co9S8/N-HPC//HPC的不对称超级电容器（ASC）。它在263.3 W kg（-1）的功率密度下提供了77.1 W h kg（-1）的能量密度，并且即使在25.9 kW kg（-1）下也保持高达36.1 W h kg（-1）。据信，所提出的工作开辟了一种新的策略，以制造高性能的超级电容器电极。
The design of advanced supercapacitors requires electrode materials that combine high surface area with a developed hierarchical porous structure to facilitate ion transport and electrolyte permeability. Herein, we report a cross-linking and in situ sulfuration strategy for synthesizing nickel sulfide (Ni3S2) nanocrystal-attached cobalt sulfide (Co9S8) encapsulated on three-dimensional (3D) N-doped hierarchical porous carbon (Ni3S2@Co9S8/N-HPC). The Ni3S2@Co9S8/N-HPC composite was extensively studied using different characterization technologies. The results revealed that the obtained material integrated the advantages of a developed N-doped carbon framework (fast ion transport and excellent electrical conductivity) and transition metal sulfide species (high theoretical specific capacitance). Benefiting from the synergistic effect of a strawberry-like Ni3S2@Co9S8 structure and 3D interconnected hierarchical porous carbon, the resulting Ni3S2@Co9S8/N-HPC composite exhibited an ultrahigh attractive specific capacitance of 1970.5 F g(-1) at a current density of 0.5 A g(-1) and excellent cycling stability with a capacitance retention of 89.5% after 5000 cycles at 10 A g(-1). In addition, an asymmetric supercapacitor (ASC) of Ni3S2@Co9S8/N-HPC//HPC was assembled in a 6 M KOH electrolyte. It delivered an energy density of 77.1 W h kg(-1) at a power density of 263.3 W kg(-1), and it remained as high as 36.1 W h kg(-1) even at 25.9 kW kg(-1). It is believed that the presented work opens up a new strategy to fabricate high-performance supercapacitor electrodes.