Breakthrough in Oxygen Evolution Reaction Catalysts

Strategic Insights -

Research from the Wuhan Institute of Technology has made a significant discovery in the field of Chemicals and Chemistry, specifically in the oxygen evolution reaction (OER) catalysts. According to the study, the introduction of iridium element into Cobalt-Nickel layered double hydroxides (LDHs) enhances the OER performance, reducing the initial overpotential and improving the reaction efficiency. The new electrocatalyst, named CoNiIr ZLDH, exhibits strong electrochemical stability and maintains its performance for nearly 24 hours under harsh conditions.

Key Takeaways:

  • The CoNiIr ZLDH electrocatalyst reduces the initial overpotential of the OER reaction to 202 mV and 280 mV at current densities of 10 mA cm and 100 mA cm, respectively.
  • The new electrocatalyst exhibits strong electrochemical stability, maintaining its performance for nearly 24 hours under harsh conditions.
  • The spin-orbit coupling effect of the 5d-orbital containing element Ir is responsible for the high catalytic activity of CoNiIr ZLDH.
  • The addition of Ir to CoNi LDH reduces the adsorption energy of oxygen species and promotes the transfer of electrons and substances, lowering the reaction overpotential and improving the reaction efficiency.
  • The research concludes that this discovery provides new ideas for the practical design of OER electrodes in electrochemical water splitting.

Statistics:

  • 202 mV: initial overpotential of the OER reaction for CoNiIr ZLDH at a current density of 10 mA cm.
  • 280 mV: initial overpotential of the OER reaction for CoNiIr ZLDH at a current density of 100 mA cm.
  • 24 hours: duration of electrochemical stability of CoNiIr ZLDH under harsh conditions.
  • 60 mA cm: high current density maintained by CoNiIr ZLDH under harsh OER conditions.

Sources:

  • "Ir-Induced Local Charge and Electron-Spin Regulation on CoNi LDH Electrocatalyst for Efficient Oxygen Evolution Reaction" (2025): 7313-7321, The Journal of Physical Chemistry Letters.
  • Wuhan Institute of Technology, Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering.
  • Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA.