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Here, we assembled a CuCo2-NSs/NiCo2S4 nano-flower clusters hetero-structured materials directly grown on nickel foam. The prepared material showed an extremely high capacitance of 3.10 F cm−2 with excellent reversibility. An important factor in achieving excellent performance is the heterogeneous structure. An asymmetric supercapacitor is constructed by placing CuCo2-NSs/NiCo2S4 and activated carbon electrodes parallel to each other. The asymmetric supercapacitor has a high energy density of 48.2 W h kg−1 at a power density of 245.0 W kg−1 and the capacity retention remains still 98.5% after 7000 cycles. [ABSTRACT FROM AUTHOR]

A lot of attention is being paid to developing new electrode materials for energy storage with good stability and excellent specific capacitance. This work involves hydrothermal and oxidation processes to grow NiCo2@PEDOT/PMo12 materials on carbon cloth. At 20 mA cm−2, the prepared electrodes show an extremely high capacitance of 3476 mF cm−2. The results prove that NiCo2, PEDOT, and PMo12 ternary components synergized to promote electron transport and electrolyte diffusion. The SC device presents a high energy density of 0.41 mW h cm−3 at a power density of 8.57 mW cm−3, and cycle stability test shows 108.1 % after 600 cycles and 74.5 % after 6000 cycles. In addition, the capacitance of the ASC device is smaller than that of the SC, but the device retains 101.4 % of its initial capacitanc after 10000 cycles at 2 mA cm−2. [ABSTRACT FROM AUTHOR]

In this work, NiCo-LDH@CuCo2O4/Ti3C2 core–shell structured electrode materials are grown on Ni foam by hydrothermal routes. The as-prepared electrode exhibited an ultra-high gravimetric capacitance of 3480 mF cm−2 with good reversibility. The excellent performances can be attributed to the unique heterogenous structure. An asymmetric hybrid supercapacitor is assembled by using NiCo-LDH@CuCo2O4/Ti3C2 as the positive electrode and activated carbon as the negative electrode. The ASC presents high energy density (0.72 mW h cm−3 at a power density of 57.6 mW cm−3) and a capacity retention of 99.5% after 6000 cycles. [ABSTRACT FROM AUTHOR]

• 2D Mxene-Ti 3 C 2 intercalated ZnCo 2 O 4 nanowires have been successfully synthesized. • The introduction of Ti 3 C 2 accelerates the dynamics of electrochemical reactions. • An ASC exhibits high energy density and 90.5% capacity retention after 10,000 cycles. It is necessary to develop hierarchical structured materials with excellent electrochemical characteristics and stability for energy storage. In this work, we synthesize a novel structure of ZnCo 2 O 4 /Ti 3 C 2 on Ni foam by a simple hydrothermal method. The frameworks accelerates the kinetic of the electrochemical reaction and promotes the transfer of electrons. The cycling stability of the device maintains 108.2% after 4000 cycles. The result indicates that the prepared sample is an excellent candidate material for energy storage. [ABSTRACT FROM AUTHOR]