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

Abstract

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.

Wire-Shaped 3D-Hybrid Supercapacitors as Substitutes for Batteries

“…In the charge/discharge test, NiCo LDH/3D-Ni had a high discharging time due to faradaic reactions between − 0.2 and 0.5 V. However, a simple surface reaction such as formation of an electric double layer in the low potential , 70 F cm −3 (13.56 mAh cm −3 ), 0.99 F cm −2 (0.19 mAh cm −2 ), and 0.18 F cm −1 (0.035 mAh cm −1 ), respectively. The obtained capacitances of NiCo LDH/3D-Ni were significantly higher than those of previously reported battery-type wire electrodes [27][28][29][30][31][32]. The volumetric capacitance values versus scan rates for NiCo LDH/3D-Ni are displayed in Fig.…”

Hybrid Architectures based on 2D MXenes and Low‐Dimensional Inorganic Nanostructures: Methods, Synergies, and Energy‐Related Applications

“…Moreover, the disadvantages of NiCo‐LDHs, such as low electronic conductivity and strong tendency to aggregate, can be effectively compensated for by loading on MXenes. As a convincible demonstration, the NiCo‐LDH@Ti 3 C 2 T x nanohybrids prepared by electrodeposition were able to overcome the poor cycle stability (especially at high rates) and low electronic conductivity of LDH‐type electrodes, as well as the low specific capacitance of MXene‐type electrodes for supercapacitors . The Ti 3 C 2 T x nanosheets could create abundant pathways for electron and ion transport, and prevent the aggregation of the NiCo‐LDH flakes during charging/discharging.…”

“…Through this strategy, a firm and uniform coating of LDH would be synthesized on the surface of MXenes. Li et al employed an electrodeposition technique to synthesize NiCo‐LDH@Ti 3 C 2 T x nanohybrids on nickel foam without binders . The NiCo‐LDH flakes were evenly deposited on Ti 3 C 2 T x , forming an open porous structure for enhanced capacitance.…”

Hydrotalcite-Type Materials Electrodeposited on Open-Cell Metallic Foams as Structured Catalysts

“…The electrodeposition of hydroxides was originally developed for the modification of small and simple-shaped electrodes with Ni(OH) 2 [33,34] and it was later extended to the deposition of more complex hydrotalcite-type (HT) compounds, also called layered double hydroxides, with general formulaand Co/Al or Co/Cr HTs [36] were initially synthesized onto a Pt-foil cathode then Ni/Co, Ni/Fe, and Co/Fe formulations were applied as sensors [37], redox supercapacitors [38,39] and, more recently, as electrocatalysts, mainly for oxygen evolution reaction [40][41][42]. In these two latter fields, there is a growing interest in replacing conventional 2D by 3D supports such as fibers [43,44] and open-cell foams [45][46][47].In this context, we reported for the first time in 2008 the electro-base generation method to coat FeCrAlloy foams with HT compounds for the preparation of H 2 production structured catalysts [48]. Later, electrodeposition has been used to coat FeCrAlloy foams by Rh [49], Pt [50] and Pt-CeO 2 [51], as gas-phase structured catalysts.…”

“…and Co/Al or Co/Cr HTs [36] were initially synthesized onto a Pt-foil cathode then Ni/Co, Ni/Fe, and Co/Fe formulations were applied as sensors [37], redox supercapacitors [38,39] and, more recently, as electrocatalysts, mainly for oxygen evolution reaction [40][41][42]. In these two latter fields, there is a growing interest in replacing conventional 2D by 3D supports such as fibers [43,44] and open-cell foams [45][46][47].…”