Electrodeposited Ni-Co layered double hydroxides on titanium carbide as a binder-free electrode for supercapacitors

We report the synthesized mixture of MXene and Ni-Co LDH on nickel foam by an electrodeposition technique. The specific capacitance of the mixture attained 983.6 F g(-1) at a discharge current of 2 A g(-1), which is greater than that of pure MXene. Compared to Ni-Co LDH, the sample created through electrodeposition provided a better rate capability of 983.6 F g(-1) at 2 A g(-1) and 536.6 F g(-1) at 50 A g(-1) and cycling stability with 76% retention after 5000 cycles at 30 A g(-1). Moreover, a solid-state asymmetric supercapacitor with MXene-LDH as the positive electrode and multi-walled carbon nanotube coated on the nickel foam as the negative electrode delivers high energy density (36.70 Wh kg(-1) at the power density of 1.44 kW kg(-1)), which outperforms the other devices reported previously. (c) 2017 Elsevier Ltd. All rights reserved.