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Photo Energy-Enhanced Oxygen Reduction and Evolution Kinetics in Zn-Air Batteries.

Hange Feng1,2, Chaomin Zhang3, Menghao Luo2

  • 1College of Information Science and Technology, Donghua University, Shanghai 201620, P.R. China.

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This study introduces a novel S-scheme titanium dioxide-indium selenide (TiO2-In2Se3) catalyst that utilizes solar energy to enhance oxygen reduction (ORR) and oxygen evolution (OER) reactions for improved photo-enhanced batteries.

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S-scheme heterojunctionZn-air batteriesoxygen evolution reactionoxygen reduction reactionphoto-introduced

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Photocatalysis

Background:

  • The oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are critical for energy storage devices like Zn-air batteries.
  • Improving the sluggish kinetics of ORR and OER is essential for efficient energy conversion.
  • Directly harvesting solar energy offers a promising route to boost these electrochemical reactions.

Purpose of the Study:

  • To develop a novel photocatalyst for enhancing ORR and OER kinetics.
  • To investigate the mechanism of solar energy harvesting for electrocatalysis.
  • To evaluate the performance of the catalyst in photo-enhanced Zn-air batteries.

Main Methods:

  • Synthesis of a step-scheme (S-scheme) titanium dioxide-indium selenide (TiO2-In2Se3) heterojunction catalyst.
  • Electrochemical characterization of the catalyst for ORR and OER under light illumination.
  • Analysis of charge carrier dynamics within the heterojunction using principles of band alignment.

Main Results:

  • The TiO2-In2Se3 heterojunction exhibited an ORR onset potential of 1.28 V and an OER onset potential of 0.48 V under illumination.
  • Photogenerated electrons from TiO2's conduction band transferred to In2Se3's valence band, facilitated by the built-in electric field.
  • The efficient separation and utilization of photogenerated charge carriers significantly boosted the ORR/OER kinetics.

Conclusions:

  • The S-scheme TiO2-In2Se3 heterojunction effectively harvests solar energy to accelerate ORR and OER.
  • The catalyst demonstrates significant potential for commercial applications in photo-enhanced Zn-air batteries.
  • This work presents a new strategy for designing efficient photocatalysts for energy conversion applications.