Liu Qiang, Hou Jiagang, Hao Qin, Huang Peng, Xu Caixia, Zhou Qiuxia, Zhou Ji, Liu Hong
Institute for Advanced Interdisciplinary Research (iAIR), Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, Shandong Province, China.
Nanoscale. 2020 Nov 19;12(44):22778-22786. doi: 10.1039/d0nr05789d.
Hierarchical nitrogen-doped carbon encapsulated hollow ZnSe/CoSe2 (ZnSe/CoSe2@N-C) nanospheres are fabricated by a convenient solvothermal and selenization approach, followed by a carbonization process. The as-obtained ZnSe/CoSe2@N-C possesses a multilevel nanoscale architecture composed of a thin carbon shell with a size of around 12 nm and hollow selenide nanoparticles as the core with tiny rough grains and rich voids as the subunits. The robust carbon protective shell and synergistic effect between double metal ions boost the electron and ion transportation as well as promote effective extraction and insertion of lithium ions. Hollow ZnSe/CoSe2@N-C spheres show high reversible capacity with 1153 mA h g-1 remaining over 100 cycles at 100 mA g-1. In particular, the hollow ZnSe/CoSe2@N-C spheres show an outstanding cycling stability at a high rate of 2000 mA g-1 with the reversible capacity of up to 966 mA h g-1 remaining after 500 cycles. As an advanced anode, ZnSe/CoSe2@N-C composite shows remarkable cycling stability and exceptional rate capability in the field of energy storage technologies.
通过简便的溶剂热法和硒化法，随后进行碳化过程，制备出了分级氮掺杂碳包覆的中空ZnSe/CoSe2（ZnSe/CoSe2@N-C）纳米球。所得到的ZnSe/CoSe2@N-C具有多级纳米结构，由尺寸约为12nm的薄碳壳和以微小粗糙颗粒和丰富空隙为亚单元的中空硒化物纳米颗粒作为核心组成。坚固的碳保护壳以及双金属离子之间的协同效应促进了电子和离子的传输，并推动了锂离子的有效提取和嵌入。中空的ZnSe/CoSe2@N-C球在100mA g-1下循环100次后仍具有1153mA h g-1的高可逆容量。特别地，中空的ZnSe/CoSe2@N-C球在2000mA g-1的高电流密度下表现出出色的循环稳定性，在500次循环后仍具有高达966mA h g-1的可逆容量。作为一种先进的负极材料，ZnSe/CoSe2@N-C复合材料在储能技术领域展现出卓越的循环稳定性和优异的倍率性能。
