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A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
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Hydrazine-Assisted Acidic Water Splitting Driven by Iridium Single Atoms.

Fang Luo1, Shuyuan Pan2, Yuhua Xie2

  • 1College of Materials Science and Engineering, State Key Laboratory of New Textile Materials & Advanced Processing Technology, Wuhan Textile University, Wuhan, 430200, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|September 29, 2023
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Summary
This summary is machine-generated.

This study introduces iridium single-atom catalysts (Ir-SA/NC) for efficient hydrazine oxidation reaction (HzOR) and hydrogen evolution reaction (HER) catalysis. Hydrazine-assisted water splitting using Ir-SA/NC requires significantly lower voltage and shows enhanced stability.

Keywords:
hydrazine oxidation reactioniridium single atomsoxygen evolution reactionwater splitting

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Materials Science

Background:

  • Water splitting for hydrogen production typically requires high voltages (>1.5 V), limiting single-atom catalyst stability, especially in acidic media.
  • Oxygen evolution reaction (OER) is a bottleneck in water splitting due to high overpotential and stability issues.
  • Replacing OER with hydrazine oxidation reaction (HzOR) can reduce overall voltage requirements.

Purpose of the Study:

  • To investigate the efficacy of iridium single-atom catalysts supported on nitrogen-doped carbon (Ir-SA/NC) for hydrogen evolution reaction (HER) and HzOR.
  • To evaluate the stability and activity of Ir-SA/NC in acidic electrolytes (0.5 M H2SO4).
  • To elucidate the reaction pathway of HzOR on Ir-SA/NC.

Main Methods:

  • Synthesis and characterization of Ir-SA/NC electrocatalyst.
  • Electrochemical measurements for HER and HzOR in 0.5 M H2SO4.
  • In situ Raman spectroscopy to study the HzOR mechanism.

Main Results:

  • Ir-SA/NC exhibited a high mass activity of 37.02 A mgIr−1 for HER at 50 mV overpotential, 127 times higher than Pt/C.
  • For HzOR, Ir-SA/NC achieved 10 mA cm−2 at a low potential of 0.39 V vs RHE, significantly lower than OER (1.5 V vs RHE).
  • Ir-SA/NC demonstrated superior stability in HzOR catalysis and an 83-fold enhanced mass activity compared to Pt/C at 0.5 V vs RHE.

Conclusions:

  • Ir-SA/NC is a robust electrocatalyst for both HER and HzOR in acidic media.
  • Hydrazine-assisted water splitting using Ir-SA/NC operates at a substantially reduced voltage (0.39 V), offering a 1.25 V saving compared to acidic water splitting.
  • The proposed HzOR pathway on Ir-SA/NC involves N2H4 →*2NH2 →*2NH→2N→*N2 →N2.