In Situ Construction of a Heterostructured Zn-Mo-Ni-O-S Hollow Microflower for High-Performance Hybrid Supercapacitors

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• Abstract:The rational design of a multicomponent electrode material with hollow structures grown on the conductive substrate is an effective approach to boost the electrochemical performance of supercapacitors (SCs). However, there is still a challenge in the in situ construction of such unique structures on the conductive substrate. Herein, a heterostructured multicomponent electrode material, a Zn-Mo-Ni-O-S hollow microflower (Zn-Mo-Ni-O-S HMF) in situ grown on a Ni foam (NF), is fabricated by a simple top-down strategy. Based on the ion-exchange and Kirkendall effect, the microflowers are composed of numerous hollow nanosheets, which are covered by uniform ZnS nanoparticles with a robust adherence. Profiting from the structural merits and the synergistic effect of multiple components, the Zn-Mo-Ni-O-S electrode exhibits a high areal capacitance of 4.39 C cm(-2) (6.27 F cm(-2)) at 1 mA cm(-2), which is 3.6 times higher than the 0.86 C cm(-2) (1.72 F cm(-2)) of the Zn-Mo-O precursor and 1.7 times higher than the 2.65 C cm(-2) (3.79 F cm(-2)) of Ni3S2/NiMoO4 (Mo-Ni-O-S). The Zn-Mo-Ni-O-S HMF displays an excellent cycling performance (maintaining 87.9% after 3000 cycles). The hybrid supercapacitor device is assembled by the Zn-Mo-Ni-O-S HMF as the positive electrode and active carbon (AC) as the negative electrode. The device delivers a high energy density of 60.8 Wh kg(-1) at a power density of 750.2 W kg(-1). The synthetic route provides a reference to the in situ construction of a heterostructured multicomponent electrode material for high-energy SCs.
• Volume:4
• Issue:1
• Translation or Not:no