The needle-like Co Mo O with multi-modal porosity was synthesized via simple strategy of chemical coprecipitation in hydrothermal condition. The resulted products were characterized with SEM, EDXS, XPS , XRD , Raman, BET, FTIR and electrochemical techniques . The needle-like Co Mo O exhibited excellent electrochemical performance as supercapacitor . A large capacitance value of 1180 F/g was obtained with good cycle life from the CV plots at 5 mV/s or 302 F/g was calculated from the discharge curve at 1 A/g. The good electrochemical performance may be attributed to the multi-modal microstructure of the needle-like Co Mo O with the combination of microporosity , mesoporosity and macroporosity which leads to the large surface area and the excellent contact probability, diffusion efficiency and storage ability of OH − ions. It’s observed for the first time that MoO 3 in the needle-like Co Mo O gradually flows away with the charge-discharge. The presence of Mo may not directly contribute to the electrochemcal capacitance of the materials but it helps to form the structure of the obtained needle-like Co Mo O and thus indirectly affect the electrochemical performance of the needle-like Co Mo O.
Fan Li,Zongyu Huang,Rong Hu,Wei Chen,Yundan Liu,Xiang Qi
In this paper, a worm-like CoMoO₄/expanded graphite (EG) composites materials prepared by hydrothermal method is presented. The composite material combines the high capacitance properties of the bimetallic oxide CoMoO₄ with the excellent electrical conductivity and high specific surface area of EG, realizing a significant enhancement of electrochemical properties. The results show that the specific capacitance of the CoMoO₄/EG composite is 1359 F/g at 1 A/g current density, which is far more than that of the pure CoMoO 4 (549 F/g) and EG (422 F/g). The improvement of the capacitive performance is mainly attributed to the conductive network constructed by EG to effectively accelerate the electron transport. Moreover, its high specific surface area provides abundant electrochemical reaction sites, forming a strong synergistic effect with CoMoO 4 . Further, the asymmetric supercapacitor based on this composite material achieved a high energy density of 69.96 Wh/kg at a power density of 750 W/kg, highlighting its excellent energy storage performance. This study opens up a new way for the design of capacitor electrode materials and further verifies the great advantages of the composite strategy of bimetallic oxides and carbon-based materials in enhancing the electrochemical performance. It is significant to promote the development and application of high-performance capacitors.
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