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Surface-Tailored Medium Entropy Alloys as Radically Low Overpotential Oxygen Evolution Electrocatalysts.

Hoonkee Park1, Jae Wung Bae2, Tae Hyung Lee1

  • 1Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|January 22, 2022
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Summary

Medium-entropy alloys (MEAs) show high catalytic activity and stability for oxygen evolution reactions (OERs). Optimized MEAs achieve low overpotential for efficient hydrogen generation in a solar-driven system.

Keywords:
electrocatalystsmedium-entropy alloysoxygen evolution reactionphotovoltaic-electrochemical systemswater splitting

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Noble metal electrocatalysts are effective but costly.
  • High-entropy alloys (HEAs) offer potential for improved catalytic properties due to stability and compositional diversity.
  • Oxygen evolution reactions (OERs) are critical for water splitting but require efficient catalysts.

Purpose of the Study:

  • To develop novel medium-entropy alloys (MEAs) as efficient and stable electrocatalysts for OERs.
  • To optimize MEA surface properties for enhanced catalytic performance.
  • To integrate MEAs into a photovoltaic-electrochemical system for solar hydrogen production.

Main Methods:

  • Fabrication and characterization of medium-entropy alloys (MEAs).
  • Surface tailoring of MEAs using anodizing and cyclic voltammetry activation.
  • Electrochemical testing in alkaline media to determine OER performance.
  • Integration with a perovskite/Si tandem solar cell for solar-to-hydrogen efficiency measurements.

Main Results:

  • Optimized MEAs demonstrated excellent OER activity with a low overpotential of 187 mV at 10 mA cm⁻².
  • The tailored MEA surface exhibited improved electrical properties and hydrophilicity.
  • A combined system achieved a high solar-to-hydrogen conversion efficiency of 20.6% for unassisted hydrogen generation.

Conclusions:

  • Medium-entropy alloys (MEAs) are promising alternatives to noble metal electrocatalysts for OERs.
  • Surface engineering of MEAs is crucial for achieving high catalytic efficiency and stability.
  • This work presents a viable pathway for sustainable and efficient solar-driven water splitting systems.