Abstract
MnCo2O4-based electrode materials with typical pseudocapacitive characteristics are ideal candidates for high energy density supercapacitors; yet high areal/gravimetric capacitances are still to be explored. Herein, we report a facile synthesis of monocrystalline MnCo2O4 on carbon cloth (MnCo2O4@CC) by a molten salt process and the mass loading can be tuned via simply changing the concentration of metal precursors. The 0.3MnCo2O4@CC sample with an optimized mass loading of 3.37 mg cm−2 shows the highest capacitance of 5.22 F cm−2/1524.6 F g−1 at 5 mA cm−2. As the concentration of precursors continuously increases, the excessive MnCo2O4 particles agglomerate and lead to reduced surface area and increased resistance, making the electrode display poorer capacitive performance. The asymmetric supercapacitor assembled by using the MnCo2O4@CC as the positive electrode and the TiO2@CC as the negative material delivers an energy density of 43.68 Wh kg−1 at 938.8 W kg−1 and a favorable value of 31.99 Wh kg−1 at a power density as high as 10.4 kW kg−1. The outstanding performance of the MnCo2O4@CC electrode and the corresponding asymmetric supercapacitor developed herein is promising for electrochemical energy storages.
Published Version
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