Enhanced Electrochemical Performance of Co₂NiO₄/Ti₃C₂T_x Structures through Coupled Synergistic Effects

Abstract

In this work, Co 2 NiO 4 /MXene (Ti 3 C 2 T x ) composites as efficient electrode materials for supercapacitors are successfully synthesized by a facile one-pot hydrothermal route. The as-prepared products deliver a capacitance of 719.5 F g À 1 at 0.5 A g À 1 and keep 83.1% of initial capacitance after 10000 cycles, revealing the remarkable electrochemical performance compared with other two single electrodes. An asymmetric supercapacitor is fabricated, which presents an energy density of 49.74 Wh kg À 1 at a power density of 2752.21 W kg À 1 , demonstrating that the products can be potential candidates in high performance energy storage devices.[a] J.

Facile Synthesis of MnO2/Ti3C2Tx/CC as Positive Electrode of All‐Solid‐State Flexible Asymmetric Supercapacitor

“…[25] Nevertheless, the real capacitance of Ti 3 C 2 T x is relatively low (130 F g À 1 ), owing to the restacking of Ti 3 C 2 T x nanoflakes during the electrode fabrication processes. [26] To improve the capacitance of MXene, combining with other active materials with large specific capacitance is an effective method, [27] for example, transition metal oxide, [28,29] CNTs, [30] graphene nanosheets, [31,32] and polymers. [33] Moreover, due to the existence of surface terminations, the delaminated Ti 3 C 2 T x nanoflakes are hydrophilic with a high negative Zeta potential, which endows it to disperse nicely in polar solvents.…”

Hierarchical V4C3TX@NiO-reduced graphene oxide heterostructure hydrogels and defective reduced graphene oxide hydrogels as free-standing anodes and cathodes for high-performance asymmetric supercapacitors

“…In fact, the specific capacitance of the V 4 C 3 T X @NiO-RGO electrode was superior to those of Ti 3 C 2 T X -based electrodes reported previously, as displayed in Table S1 (ESI †). [44][45][46][47][48][49][50][51][52][53][54][55][56] The remarkable rate capability of V 4 C 3 T X @NiO-RGO is attributed to the synergistic coupling effect among the structural components and the 3D architecture. Specifically, the conductive V 4 C 3 T X core in the heterostructure offers both abundant transport channels for ions and active interfacial centers, while the ultrathin NiO shells can increase the pseudocapacitance and promote the diffusion and migration of electrolyte ions.…”

A high-performance supercapacitor based on free-standing V4C3TX@NiO-reduced graphene oxide core–shell hierarchical heterostructured hydrogel electrodes

“…29 In order to improve the specic capacitance of V 4 C 3 T X , one effective strategy is to fabricate V 4 C 3 T X -based heterostructures that combine the advantages of V 4 C 3 T X and pseudocapacitve materials. [30][31][32] The abundant terminal functional groups/atomic defects and unique 2D lamellar structure of V 4 C 3 T X render it possible to construct desired synergetic heterostructures with high structural stability. 30 V 4 C 3 T X -based heterostructures can not only strengthen the individual properties of each constituent, but also exhibit a synergistic effect of high reactivity, ultrahigh specic capacitance and superb electrical conductivity.…”

“…The specic capacitance of the V 4 C 3 T X @NiO-RGO electrode was superior to those of Ti 3 C 2 T X -based electrodes reported previously, as displayed in Table 1. [44][45][46][47][48][49][50][51][52][53][54][55][56] The excellent rate capability of V 4 C 3 T X @NiO-RGO is attributed to the synergistic coupling effect among the structural components and the 3D interconnected architecture. Specically, the highly conductive V 4 C 3 T X core in the heterostructure offers both abundant transport channels for ions and active interfacial centers, while the ultrathin NiO shells can effectively increase the capacitance.…”

“…6d). [45][46][47][50][51][52][53][54] Long-term cycle stability is another signicant factor in practical applications, which was evaluated through a consecutive charge-discharge process at a current density of 10 A g −1 for up to 10 000 cycles (Fig. 6e).…”