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Sudip Barman, Speaker at Catalysis Conferences
National Institute of Science Education and Research, India
Title : IrO2-modified RuO2 nanowires/nitrogen-doped carbon composite for effective overall water splitting in all pH


Hydrogen(H2) is a promising alternative energy source, but its current production method through steamer forming is energy intensive and polluting. Water electrolysis, specifically the oxygen evolution reaction (OER)and hydrogen evolution reaction (HER), offers a cleaner option. Development of active catalysts for HER and OER are of prime importance for the commercialization of the proton-exchange membrane (PEM)/anion-exchange membrane (AEM) water electrolyzer. In our recent work, we synthesized IrO2-modified RuO2 nanowires/nitrogen-doped carbon composite for overall water splitting at all pH. This catalyst exhibits excellent OER activity in 0.5 M H2SO4 solution with a low overpotential of 188 mV at 10 mA/cm2 current density, a low Tafel slope value of 42 mV/dec, and∼96% faradic efficiency. The OER of this catalyst in neutral and base media is also higher than that of commercial RuO2 and IrO2. IrO2−RuO2/C also showed very good HER activity with 10 mA/cm2 current density at 82 and 75 mV overpotential in acid and base, respectively. The HER performance of this catalyst is better than that of commercial Pt/C in base and slightly lower in neutral and acid. The catalyst shows excellent OER and HER stability compared to the state-of-art catalysts. In addition, the overall water-splitting performance of IrO2−RuO2/C was also studied, which shows 10 mA/cm2 current density at 1.52 and 1.51 V cell voltage in 1.0 M KOH and 0.5 MH2SO4, respectively. The outstanding activity of the IrO2−RuO2/C catalyst can be attributed to a unique one-dimensional nanowire structure, synergistic interaction, high surface area, high oxophilicity, and high mass and electron transportation between IrO2, RuO2, and the carbon support.

Audience Takeaway Notes: 

  • The electrochemical method can produce highly pure hydrogen (H2).
  • This synthesis method of nanomaterials can be applied to synthesis other nanostructured materials and can be applied in the field of catalysis.
  • One dimensional morphology, oxophilicity and synergistic interaction among different components helped to improve overall water splitting performance of the catalyst.


Sudip Barman is an Associate Professor in School of Chemical Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, Odisha, India. He received his PhD degree from Indian Institute of Science (IISc), Bangalore, Karnataka, India. He joined NISER Bhubaneswar as assistant professor in 2009. His research interest includes design and development of nanostructured materials for electrochemical energy storage and conversion such as electrochemical water splitting, Supercapacitors, Sodium ion batteries, electrochemical CO 2 reduction etc.