All-solid-state, self-powered supercapacitors: State-of-the-art and future perspectives

Tuned Bimetallic Fe–Ni Thiophosphides as Advanced Battery Materials for Asymmetric Electrochemical Supercapacitors with Outstanding Energy Density

“…In this regard, electrochemical supercapacitors are among the best energy storage candidates owing to their outstanding power density, long life cycle, and environmental friendliness. However, their energy densities are still lower than those of batteries, hindering their practical use. − Consequently, improving the energy density of supercapacitors without sacrificing their intrinsic high power density has stimulated increasing efforts recently. The construction of asymmetric supercapacitors (ASCs) is considered among the best strategies to resolve this issue by using carbon-based material as the negative pole and battery-like material as the positive pole. − The faradic process taking place at the positive side would provide high energy density, whereas high power density/rate capability could be enabled by the negative electrode material via the formed electric double layer (EDL) without any chemical interaction between the active material and the electrolyte. ,− Therefore, the ASC inherits the advantages of batteries and supercapacitors, which can improve both energy density and power density.…”

Optimized Fabrication of Bimetallic ZnCo Metal–Organic Framework at NiCo-Layered Double Hydroxides for Multiple Storage and Capability Synergy All-Solid-State Supercapacitors

“…In addition, the fluctuating nature of solar and wind energy (green and renewable) necessitates integrating them with energy storage devices. , Functional devices, such as supercapatteries, also called hybrid supercapacitors, can bridge the energy density gap between symmetric supercapacitors and batteries, while keeping distinguishable power rates . Ensuring such promising metrics, especially in a solid-state assembly, would render the practical scale-up of the supercapattery storage devices over their other energy storage counterparts. − Thereby, decent efforts have been devoted to optimizing the device components, including but not limited to the positive battery electrode of the hybrid device. − …”

Optimized Synthesis of Nanostructured Trimetallic Mn–V–Fe Selenides with Battery-Type Behavior for High-Performance Hybrid Supercapacitors

“…10 Nonetheless, the bottleneck of the wide use of supercapacitors is their low capacitance and narrow operating voltage that restrict their use in high-energy density (ED) devices. 11 In general, there are two approaches to boost the ED of supercapacitors. The first approach is to enlarge the operating potential window by using a hybrid supercapacitor, which uses a capacitive material and battery-like material as negative and positive electrodes, respectively.…”

“…Nonetheless, the bottleneck of the wide use of supercapacitors is their low capacitance and narrow operating voltage that restrict their use in high-energy density (ED) devices . In general, there are two approaches to boost the ED of supercapacitors.…”