HYBRID SUPER CAPACITORS

CONTEXT:
Scientists have developed a low-cost super capacitor device with excellent capacitive retention with a novel electrode material they have synthesized, which can pave the way for the next generation high power-high energy storage devices.

SUPER CAPACITOR

  • A super capacitor is a high-capacity capacitor with a capacitance value much higher than other capacitors, but with lower voltage limits, that bridges the gap between electrolytic capacitors and rechargeable batteries.
  • A capacitor is a device that stores electrical energy in an electric field.
  • It typically stores 10 to 100 times more energy per unit volume or mass than electrolytic capacitors, and can accept and deliver charge much faster than batteries.
  • The super capacitor is a next-generation energy storage device that has received extensive research attention owing to advantages such as high power density, long durability, and ultrafast charging characteristic as compared to conventional capacitors and lithium-ion batteries (LIB).
  • Among the four main components of a super capacitor – electrode, electrolyte, separator, and the current collector, the first two are the pivotal components, which directly determine the electrochemical behaviour of the super capacitors.
  • The fabrication cost of electrode materials, as well as electrolytes, should be reduced because these two components account for a major portion of the device manufacturing cost.
  • Super capacitors with high capacitance and excellent capacitive retention developed from low-cost fabrication techniques are the need of the hour, considering their potential utility in the commercial market.

The Study:

  • Scientists have developed a facile, scalable, and cost-effective electrochemical route to synthesize electrodes made of nickel cobaltite containing nanosheet structures with incorporated oxygen vacancies as an active material, for hybrid super capacitors.
  • These electrodes have been found to have excellent electrochemical performance.
  • The team comprised of scientists from the International Advanced Research Center for Powder Metallurgy and New Materials (ARCI), an autonomous body of the Department of Science and Technology, Government of India in collaboration with IIT Hyderabad.

SOURCE: PIB

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