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In situ coupled nickel-based layered double hydroxides with MXene to enhance supercapacitor performance

Guorong Wang,Guiquan Liu,Zhiliang Jin

The vivacious surface chemistry and impressive electrical conductivity of MXene make it an alternative two-dimensional material for the storage of electrochemical energy. Herein, Ni-based layered double hydroxides (LDHs) were hydrothermal and grown in situ on Ti3C2 to form “sandwich-like” Ti3C2@LDHs. The synthesis of sandwich-like Ti3C2@LDHs enhanced the electrochemical reactivity and energy storage of Ti3C2, but also increased the electrical conductivity and cyclic stability of NiV-LDHs and NiCo-LDHs. The electrochemical properties of Ti3C2@NiV-LDHs and Ti3C2@NiCo-LDHs composite electrodes were greater than those of NiCo-LDHs, NiV-LDHs and Ti3C2, respectively. The optimal mass-specific capacitance of Ti3C2@NiV-LDHs was up to 1346.14 F g−1 (1 A g−1), and that of Ti3C2@NiCo-LDHs was 1120.07 F g−1 (1 A g−1), which is 1.6- and 1.5-times that of NiV-LDHs and NiCo-LDHs, respectively. A Ti3C2@NiV-LDHs//activated carbon (AC) asymmetric supercapacitor cell (ASC) manifested an energy density of 46.34 W h kg−1 (at 1530.61 W kg−1), and the specific capacitance could be maintained at 78.57% after 5000 charge–discharge cycles (10 A g−1). Ti3C2@NiCo-LDHs//AC ASC exhibited an energy density of 50.29 W h kg−1 (at 1522.65 W kg−1) with 81.82% specific capacitance retention after 5000 charge–discharge cycles (10 A g−1). Our results provide a procedure for improving the conductivity and stability of Ni-based LDHs using 2D MXenes in an aqueous asymmetric supercapacitor.