Designing an Advanced Supercapacitor Electrode with High Capacitance Using Electrodeposite NiCo LDH@Vertical Aligned Graphene on Graphite Substrate

The focus on supercapacitors as energy storage solutions has grown due to their impressive power density and extended lifespan. The effectiveness of supercapacitors is heavily influenced by the characteristics of their electrodes[۱]. A novel electrode design using NiCo LDH@VAG@Graphite sheet has been developed, featuring a remarkably large surface area and exceptional capacitive performance achieved through a combination of graphite anodization and electrodeposition techniques [۲]. In this research, a cutting-edge approach was employed to enhance the properties of a graphite sheet-based electrode. The aim was to boost porosity and conductivity through anodization, paving the way for the creation of Vertically Aligned Graphene (VAG) structures integrated with ۲D-NiCo Layer Double Hydroxide (NiCo LDH) nanosheets [۳]. The deposition of NiCo LDH onto the VAG was accomplished using an innovative electrosynthesis technique. Various analytical methods were used to characterize the fabricated electrodes, including Fourier Transform Infrared (FT-IR), Scanning Electron Microscopy (SEM), and BET analysis. The resulting nanoarray configuration boasts a significant specific surface area and enhanced channels, facilitating swift ion transport and electron movement between the electrolyte and electrode. Furthermore, the impact of anodizing graphite sheets and adjusting Co-Ni ratios on electrochemical behavior was thoroughly examined. Interestingly, the process of anodizing graphite sheets not only improved electrode conductivity but also created additional active sites for NiCo LDH adhesion [۴]. The electrode's electrochemical performance was outstanding, demonstrating remarkable specific capacitance and robust cycling stability. This method presents a compelling approach for the development of high-performance supercapacitor electrodes, characterized by improved porosity and surface area. The NiCo LDH@VAG@Graphite sheet electrodes exhibited an exceptional capacitance of approximately ۷۵۱ F g-۱ at a current density of ۱ A g-۱, along with an impressive energy density of ۵۸.۴ mWh g-۱ and a power density of ۱۲۱۹.۴ mW g-۱. Moreover, they maintained a stable capacity of around ۹۸% after ۱,۰۰۰ cycles in the charge/discharge process.

کلیدواژه ها:

Supercapacitor ، layered double hydroxide ، Vertically Aligned Graphene ، Anodizing Process ، Two-Dimensional Nanomaterials