MXenes公司
材料科学
超级电容器
假电容
异质结
电极
电化学
电容
纳米技术
化学工程
光电子学
化学
工程类
物理化学
作者
Wenling Wu,Chunhui Zhao,Dongjuan Niu,Jianfeng Zhu,Dan Wei,Chengwei Wang,Lei Wang,Liuqing Yang
标识
DOI:10.1016/j.apsusc.2020.148272
摘要
An integrated system of heterostructure composites which can protect and optimize the structure and performance of single composition shows the positive signal of being interested in energy storage and conversion field. Recently, MXenes with versatile physicochemical properties are intriguing candidate materials for energy storage. Herein, by in situ nucleation and ion-exchange reaction, open NiCo2S4 nanosheets were intimately anchored onto the surfaces of ultrathin nitrogen-doped Ti3C2-MXene nanosheets (N-Ti3C2) to form the novel hierarchical N-Ti3C2/NiCo2S4 nanosheets. Furthermore, ultrathin N-Ti3C2 serves as a favorable conductive substrate not only to maintain structural stability, but also to afford the electrophilicity of electroactive centers and harmonize the electrochemical properties in multi-composition systems. On the other hand, NiCo2S4 nanosheets supply the effective channel for charge transport resulting in improved reaction kinetics and offer higher pseudocapacitance. Owing to the unique heterostructure and friendly interfacial interaction, the N-Ti3C2/NiCo2S4 electrode exhibits outstanding electrochemical performances with specific capacitance of 1849 F g−1 at 2 mV s−1, low internal resistance, excellent rate performance, and stable cycle life, which is much better than that of Ti3C2-MXene electrode. The results demonstrate that the heterostructure N-Ti3C2/NiCo2S4 was an advanced electrode, and this strategy provide the useful method to design MXenes-based electrode with superior electrochemical performance for supercapacitors.
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