Researchers from the Indian Institute of Technology Guwahati (IIT Guwahati) have developed novel materials and methods to enhance the performance of supercapacitors.
Supercapacitors are energy storage devices that work by using the electrostatic field to separate charges. They are a type of battery that can store and discharge energy very quickly, making them ideal for applications that require quick and short-term bursts of power, such as electric vehicles, renewable energy systems, and power stabilization in medical devices. However, supercapacitors are also very sensitive to environmental conditions and can gradually degrade their performance over time.
The main challenges in developing supercapacitors with high performance are increasing the areal and volumetric capacitance of the electrodes, which are the two most important factors for determining the overall efficiency of the battery. To achieve high areal capacitance, the electrodes require large amounts of energy-storing active materials, which can lead to a trade-off with respect to volume and gravimetric capacitance.
The researchers used a combination of MXene and cellulose nanofibers (CNF) to develop a high-performance composite electrode for supercapacitors. MXene is a two-dimensional inorganic material that is composed of extremely thin layers of transition metal carbides, nitrides, or carbonitrides, while CNF are filaments that are 100,000 times thinner than human hair. These nanofibers are strategically included in the composite electrode to overcome the performance trade-off with very high mass loading.
The team used a novel electric-field guided method to assemble the MXene and CNF nanomaterials into a porous hydrogel structure – gels that retain a significant amount of water. This creates blocked localized pores, which can be interconnected by introducing CNFs derived from garlic husk.
The researchers claim that the new MXene-CNF-hydrogel-derived electrodes exhibit impressively high areal and volumetric capacitance with very high areal mass loading more than 70 mg/cm2. They also maintain 96% of their capacitance after 20,000 charge-discharge cycles, which shows impressive long-term operational stability.
The successful development of these high-performance supercapacitors could pave the way for the commercialization of this promising technology. The technology has the potential to significantly improve the efficiency of energy storage devices, making them more useful for a wide range of applications.
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