Microwave-Assisted Hierarchically Grown Flake-like NiCo Layered Double Hydroxide Nanosheets on Transitioned Polystyrene towards Triboelectricity-Driven Self-Charging Hybrid Supercapacitors

Abstract

Recently, there is a need to explore the utilization of various heterostructures using the designed nanocomposites and tuning the surfaces of electrodes for improving the electrochemical performance of supercapacitors (SC). In this work, a novel approach is successfully employed through a facile two-step synthetic route with the assistance of a microwave for only 1 min. Depending on the glass transition of a polystyrene (PS) substrate and electrochemical deposition (ECD) of electroactive Ni-Co layered double hydroxides (LDHs), a hierarchically designed flake-like morphology can be readily prepared to enhance the surface-active sites, which allows a rhombohedral Ni-Co LDHs electrode to obtain superior electrochemical properties. Further, the interactions between electrode and electrolyte during the diffusion of ions are highly simplified using multiple enhanced electroactive sites and shorter pathways for electron transfer. The unique surface architecture of the PS substrate and the synergistic effect of the bimetallic components in Ni-Co LDHs enable this substrate to obtain desired electrochemical activity in charge storage systems. The optimized MWC Co0.5Ni0.5 electrode exhibited an areal capacity of 100 µAh/cm2 at a current density of 1 mA/cm2 and a remarkable capacity retention of 91.2% over 5000 continuous charging and discharging cycles due to its remarkable synergistic effect of abundant faradaic redox reaction kinetics. The HSC device is assembled with the combination of optimized MWC Co0.5Ni0.5 and activated carbon as a positive and negative electrode, respectively. Further, the electrochemical test results demonstrated that MWC Co0.5Ni0.5 //AC HSC device showed a high areal capacitance of 531.25 mF/cm2 at a current density of 5 mA/cm2. In addition, the fabricated an aqueous HSC device showed a power density of 16 mW/cm2 at an energy density of 0.058 mWh/cm2, along with the remarkable capacity retention of 82.8% even after 10,000 continuous charging and discharging cycles. Moreover, the assembled hybrid supercapacitor (HSC) device is integrated with a triboelectric nanogenerator (TENG) for the development of energy conversion and storage systems. Not only an extensive survey of materials but also an innovative solution for recent progress can confirm the wide range of potential SC applications. Remarkably, this study is a new way of constructing self-powered energy storage systems in the field of sustainable wearable electronics and future smart sensing systems.

Recent Advances in MXenes Based Composites as Photocatalysts: Synthesis, Properties and Photocatalytic Removal of Organic Contaminants from Wastewater

“…Initially, MXene materials were investigated as promising alternatives for electrochemical energy storage in batteries and supercapacitors due to their high electrical conductivity, structural stability, and hydrophilicity. [61,[65][66][67][68] The 2D layered titanium carbide powder (Ti 3 C 2 T x ) was the first MXene material that was studied extensively for energy storage and transfer in devices such as Li/Na ion batteries and supercapacitors. [69] Since then, MXene materials have found applications in various fields, including environmental remediation.…”

Recent advances in Ni-materials/carbon nanocomposites for supercapacitor electrodes

“…3, electrodes based on Ni materials and carbon nanomaterials are prominent keywords. Recently, nanocomposites of Ni materials with carbon nanomaterials as supercapacitor electrodes such as NiCo 2 S 4 /graphene, 6 Ni(OH) 2 /graphene, 7 NiCo 2 O 4 /graphene, 8,9 Ni-Co/graphene, [10][11][12][13][14][15][16][17] NiMoO 4 /graphene, [18][19][20] Ni(OH) 2 /CNTs, 21,22 Ni-Co/CNTs, [23][24][25] NiCo 2 S 4 /CNTs, [26][27][28][29] Ni-Co/porous carbon, 30 NiCo 2 S 4 /porous carbon, 31 NiCo 2 O 4 //AC, 32 Ni-Co//AC, [33][34][35][36] Ni(OH) 2 //AC, 37 and other materials have been developed.…”

Integration of Flexible Supercapacitors with Triboelectric Nanogenerators: A Review

“…On one hand, the TENG is low cost, highly efficient, environmentally friendly, and can be made from a wide variety of raw materials, making it very useful for various self-powered sensors [18][19][20][21]. On the other hand, the power outputs are typically irregularly sized pulses, determined by the strength of the mechanical trigger, and cannot be directly employed to power the majority of electronic devices [22][23][24]. SCs are outstanding in energy storage devices because of their high-power density, long life cycles, and environmental benignancy.…”