Vanadium Doping Enhances the Photo-capacity of Fe2O3 Nanoflowers

Strategic Insights -

A new breakthrough in sustainable energy research has been reported by scientists at the Indian Institute of Technology (IIT) Kanpur, India. The team, led by Sri Sivakumar, has developed a novel nanostructure that can perform the dual function of energy harvesting and storing it for future use. This innovative material, composed of vanadium-doped Fe2O3 nanoflowers, has shown exceptional performance in photo-rechargeable capacitors, with enhanced capacity values and cycling stability.

Key Takeaways:

  • The research, supported by the Science and Engineering Research Board, Council of Scientific & Industrial Research (CSIR) - India, Science and Engineering Research Board (SERB), and Department of Science & Technology (India), aimed to develop a single material that can perform both energy harvesting and storing functions.
  • The vanadium-doped Fe2O3 nanoflowers were grown in situ on nickel foam and exhibited high-capacity values of approximately 280 mA h g-1 in the dark and approximately 360 mA h g-1 under illumination.
  • Cyclic voltammetry studies showed a capacity enhancement of 89.3% at a scan rate of 1 mV s-1 for the Fe2O3 nanoparticles after doping with V5+.
  • The nanostructure emerged as a potential photocathode for photo-rechargeable capacitors with high initial charge and discharge capacities of 413 mA h g-1 and 496.6 mA h g-1, respectively.
  • The research concluded that the photo-capacitor significantly enhanced capacity values from 95 mA h g-1 (dark) to 150 mA h g-1 under illumination at 3A g-1.

Statistics:

  • 280 mA h g-1: Capacity value of the vanadium-doped Fe2O3 nanoflowers in the dark.
  • 360 mA h g-1: Capacity value of the vanadium-doped Fe2O3 nanoflowers under illumination.
  • 89.3%: Capacity enhancement of the Fe2O3 nanoparticles after doping with V5+.
  • 413 mA h g-1: Initial charge capacity of the nanostructure.
  • 496.6 mA h g-1: Initial discharge capacity of the nanostructure.
  • 95 mA h g-1: Capacity value of the nanostructure in the dark before illumination.
  • 150 mA h g-1: Capacity value of the nanostructure under illumination.

Sources:

  • Vanadium Doping Enhances the Photo-capacity of Fe 2 o 3 Nanoflowers: a Promising Photo-electrode for Aqueous Iron Ion Photo-capacitors. Sustainable Energy & Fuels, 2025.
  • NewsRx. Reports on Sustainable Energy Findings from Indian Institute of Technology (IIT) Kanpur Provide New Insights (Vanadium Doping Enhances the Photo-capacity of Fe 2 o 3 Nanoflowers: a Promising Photo-electrode for Aqueous Iron ...). Energy Weekly News. August 15, 2025; p 367.