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Hydrogen

Breakthrough in Hydrogen Production: Efficient Electrocatalysts for Water Splitting

Strategic Insights

— 2 min read

Researchers from Islamia University Bahawalpur, in collaboration with King Saud University, Russian Science Foundation, and the Ministry of Science and Higher Education of the Russian Federation, have made significant advancements in the production of hydrogen through water splitting. By developing highly efficient, abundant, and long-lasting electrocatalysts, the team has paved the way for a sustainable and green energy source. The breakthrough centers on the use of co-doped metal oxides, such as Nd-dopped CeO2 (CeNdO2), which exhibit excellent electrochemical activity and stability.

Key Takeaways:

  • The research focuses on the development of electrocatalysts for oxygen evolution in water splitting, a crucial step in producing hydrogen as a sustainable energy source.
  • The team employed a sol-gel technique to fabricate Nd-dopped CeO2 nanostructures co-doped with rare earth metals and analyzed them using state-of-the-art methods to study their structural, morphological, elemental, electrical, and electronic capabilities.
  • The fabricated samples were coated on nickel foam (NF) and fluorinated tin oxide (FTO) substrate for electrochemical splitting of water in a 1.0 M KOH solution. The results showed that Pr/Nd co-doped CeO2 grown on NF demonstrated high electrochemical activity with a significantly reduced OER over-potential of around 274 mV, Tafel slope around 84 mV/dec, and increased electrochemical surface area.
  • The interactions with oxy-radicals, confirmed by XPS and Raman, are thought to be the source of easy charge transport and decreased overpotential. The least charge transfer resistance of Pr-doped CeNdO2/NF presented excellent electroactivity due to reduced polarization resistance between the electrolyte and catalyst material.
  • The high stability of the Pr-doped CeNdO2/NF electrode was exposed by continuous cyclic voltammetry sweeps of electrolysis up to 1500 cycles, making it a practical solution for water electrolysis.
  • The research revealed a synergistic effect between metal atoms (Ce, Nd, and Pr) on nickel foam substrate, which is mainly responsible for electron transfer and well-balanced kinetics under beginning conditions.

Statistics:

  • The electrocatalyst Pr/Nd co-doped CeO2 showed an OER over-potential of around 274 mV, significantly reduced from previously known values.
  • The Tafel slope for the Pr/Nd co-doped CeO2 was around 84 mV/dec, indicating excellent electrochemical activity.
  • The increased electrochemical surface area of the Pr/Nd co-doped CeO2 was observed, making it a promising material for water splitting.
  • The high stability of the Pr-doped CeNdO2/NF electrode was demonstrated by continuous cyclic voltammetry sweeps of electrolysis up to 1500 cycles.

Sources:

  • Unravelling the Operando Structural and Chemical Stability of Rare Earth Metals Co-doped Ceo2-based Electrocatalysts for Oxygen Evolution Reaction. International Journal of Hydrogen Energy, 2025;137:1097-1106.
  • Faisal Iqbal, Islamia University Bahawalpur, Institute of Physics, Bahawalpur 63100, Pakistan.
  • Tauseef Munawar, Ambreen Bashir, Faisal Mukhtar, Mehar Un Nisa, Muhammad Naeem Ashiq, Razan A. Alshgari, Saikh Mohammad, Muhammad Fahad Ehsan, and Suleyman I. Allakhverdiev.

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