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Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy
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Tensile Strain-Mediated Spinel Ferrites Enable Superior Oxygen Evolution Activity.

Yaotian Yan1, Jinghuang Lin2, Keke Huang1

  • 1State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China.

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|October 24, 2023
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Summary

Strain engineering of spinel oxides enhances oxygen evolution reaction (OER) electrocatalysts. This method reduces energy barriers, achieving low overpotentials and stable water splitting for efficient energy conversion.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Oxygen evolution reaction (OER) electrocatalysts face performance limitations critical for applications like water splitting.
  • Developing efficient OER electrocatalysts is essential for advancing sustainable energy technologies.

Purpose of the Study:

  • To explore strain engineering as a strategy to enhance the activity of spinel oxide OER electrocatalysts.
  • To investigate the effect of tunable lattice strain on NiFe2O4 nanoparticles for improved OER performance.

Main Methods:

  • Utilized interfacial thermal mismatch between NiFe2O4 nanoparticles and a carbon fiber substrate to induce lattice strain.
  • Analyzed the electronic structure changes, including band flattening and reduced pseudo-band gap, due to tensile lattice strain.
  • Fabricated an asymmetric alkaline electrolytic cell to test the performance of strained NiFe2O4 electrocatalysts.

Main Results:

  • Achieved a low OER overpotential of 180 mV at 10 mA/cm² with strained NiFe2O4.
  • Demonstrated a water decomposition voltage range of 1.52-1.56 V at 10 mA/cm².
  • Verified robust stability with approximately 99.4% voltage retention after 100 hours of operation.

Conclusions:

  • Tunable strain engineering effectively enhances OER activity in spinel oxides by modifying electronic properties.
  • The developed strained NiFe2O4 exhibits excellent catalytic performance and stability for water splitting.
  • This strain engineering approach is broadly applicable to other spinel ferrite systems (Co, Mn, Zn) for OER catalysis.