The International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), an autonomous institute under the Department of Science and Technology (DST), Government of India, has developed a high-voltage supercapacitor capable of operating at a record 3.4 volts, significantly surpassing the conventional 2.5–3.0 V limit of existing supercapacitor technologies.
The breakthrough has been achieved using a dual-functional porous graphene carbon nanocomposite (PGCN) electrode, which enables substantially higher energy density, enhanced electrochemical efficiency, and long-term operational stability. The development is expected to improve the performance of energy storage systems across electric vehicles (EVs), renewable energy integration, grid-scale storage, and portable electronics.
Conventional supercapacitors are restricted by electrolyte instability, thermal degradation, and safety concerns such as flammability, which limit their voltage window. ARCI’s newly engineered PGCN electrode overcomes these challenges through advanced surface chemistry, combining water-repellent properties with high compatibility for organic electrolytes. This design suppresses moisture-induced degradation while enabling rapid electrolyte penetration into the porous carbon framework, resulting in faster ion transport and improved electrochemical kinetics.
According to ARCI, the newly developed supercapacitor delivers 33% higher energy density than conventional carbon-based devices and achieves a power density of up to 17,000 W/kg. The device also demonstrates exceptional cycling stability, retaining 96% of its performance after 15,000 charge–discharge cycles, indicating strong durability for high-demand applications.
The PGCN electrodes were fabricated through an environmentally sustainable hydrothermal carbonization process, using 1,2-propanediol as a precursor. The synthesis, conducted at 300°C for 25 hours in a sealed system, eliminates the use of hazardous chemicals and external gases, while delivering material yields exceeding 20%. The method is also scalable, making it suitable for industrial-scale manufacturing.
The electrode’s engineered micro- and mesoporous architecture enhances ion diffusion and energy storage capacity, while controlled synthesis ensures consistent material performance. Compared with commercial activated carbon electrodes such as YP-50F, the PGCN electrode simultaneously improves operating voltage and power density.
By enabling higher voltage operation, the technology reduces the need for stacking multiple low-voltage cells, thereby simplifying system design, lowering complexity, and improving overall energy efficiency. This advancement is expected to enhance EV driving range and acceleration, support stable solar power integration, and improve grid balancing capabilities.
The development aligns with India’s clean energy transition goals and the Aatma Nirbhar Bharat initiative, strengthening domestic capabilities in advanced energy storage technologies. The research has been published in the Chemical Engineering Journal (Elsevier) and was supported by the Department of Science and Technology under its Technical Research Centre (TRC) initiative.
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