Almost everything around us requires energy to be built and kept in working order. However, two-thirds of all greenhouse gas emissions worldwide are caused by the production and consumption of energy. As a result of mankind's excessive use of fossil fuels, fossil fuel sources have been rapidly depleted, and air pollution has increased, causing long-lasting and possibly irreparable harm to our climate. For society to develop sustainably, it is imperative to address the problem of climate change. At the same time, it is crucial to guarantee access to energy to promote economic growth and improve quality of life, particularly in less developed regions of the world. The globe is currently moving toward renewable energy sources like solar energy, wind energy, and so on. To effectively gather and store the energy produced by renewable sources is difficult in moving away from fossil fuels. Unfortunately, renewable energy sources are sporadic in nature and not entirely exploitable at the time of production. Therefore, there is a critical need for effective energy storage systems to utilise green energy in the future. There are many different types of effective energy conversion and storage devices on the market right now, including batteries, conventional capacitors, electrochemical capacitors, fuel cells and hydrogen storage systems . Fuel cells including solid oxide fuel cells because of their superior efficiency and fuel flexibility too are being investigated heavily by the scientific community . Due to their superior electrochemical characteristics, which include a high specific power, rapid charging/discharging rate and outstanding cycling life, supercapacitors or electrochemical capacitors (ECs) have garnered significant attention among them. In contrast to batteries, modern supercapacitors still have low specific energy. The Ragone plot for several energy storage systems, including fuel cells, supercapacitors, traditional batteries and regular capacitors is shown in Figure .1. This graph shows the amount of particular energy (Wh/kg) and specific power (W/kg) for each device as a function of discharging time (E=Pt). Batteries may provide a lot of energy (100-200Wh/kg), but because they take longer to recharge, their specific power performance suffers . Due to their higher specific power (500-10,000 W/kg) compared to batteries and their satisfying specific energy (1-10 Wh/kg) compared to conventional capacitors, supercapacitors are recognised as important members of the energy storage family . It is also important to note that supercapacitors have an increased cycle lifespan and can be fully charged/discharged at a fast rate . Two key strategies have been thoroughly investigated for boosting the specific energy to get beyond this restriction: (i) fabricating high specific capacitance advanced supercapacitors, and (ii) expanding the potential window from the electrolyte chosen .