Resent Development of Binder‐Free Electrodes of Transition Metal Oxides and Nanohybrids for High Performance Supercapacitors – A Review

Abstract

The entire world is aware of the serious issue of global warming and therefore utilizing renewable energy sources is the most encouraging steps toward solving energy crises, and as a result, energy storage solutions are necessary. The supercapacitors (SCs) have a high‐power density and a long cycle life, they are promising as an electrochemical conversion and storage device. In order to achieve high electrochemical performance, electrode fabrication must be implemented properly. Electrochemically inactive and insulating binders are utilized in the conventional slurry coating method of making electrodes to provide adhesion between the electrode material and the substrate. This results in an undesirable “dead mass,” which lowers the overall device performance. In this review, we focused on binder‐free SCs electrodes based on transition metal oxides and composites. With the best examples providing the critical aspects, the benefits of binder‐free electrodes over slurry‐coated electrodes are addressed. Additionally, different metal‐oxides used in the fabrication of binder‐free electrodes are assessed, taking into account the various synthesis methods, giving an overall picture of the work done for binder‐free electrodes. The future outlook is provided along with the benefits and drawbacks of binder‐free electrodes based on transition metal oxides.

In situ growth of a redox-active metal–organic framework on electrospun carbon nanofibers as a free-standing electrode for flexible energy storage devices

“…This leads to sluggish kinetics during the electrochemical reaction, resulting in a shorter cycling life and lower electrochemical performance. 15 Also, these substrates are expensive and reduce the electrode wettability. Some self-supported and binder-free electrodes, such as metal-selenides, 16 metal sulfides, 17 and other advanced aerogel-based materials, 18 have been explored in the last decade.…”