Abstract
Designing high-performance electrodes and elucidating their energy storage mechanisms are crucial for supercapacitors. In this study, an in situ conversion method is firstly employed to transform CoCH (Co(CO3)0.5(OH)·0.11 H2O) into Co-MOF-74 nanorods, which serves as a self-sacrificial template. Subsequently, the amorphous CoMoS4 hollow tube arrays with self-assembled nanosheet surfaces are obtained through MoO42- etching and S2- exchange. Benefiting from the nanosheets-coated hollow tubular structure and amorphous characteristics, CoMoS4 exhibits a high areal capacitance of 7.01 F·cm−2 at 2 mA·cm−2 and 91.81 % retention after 5000 cycles. When further assembled into a hybrid supercapacitor, the CoMoS4//AC device exhibits excellent performance with the energy density of 0.684 mWh·cm−2 at 1.876 mW·cm−2 and 91.39 % retention after 10000 cycles. Furthermore, the mechanism study reveals that Mo- and S-doped amorphous CoOOH is a genuine energy storage material. This work provides valuable insights into the preparation of amorphous materials using the self-sacrificial template transformation method and the understand of their energy storage mechanisms.
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