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High Quantum Efficiency Hot Electron Electrochemistry.

Hyun Uk Chae1, Ragib Ahsan1, Qingfeng Lin1

  • 1Department of Electrical and Computer Engineering , University of Southern California , Los Angeles , California 90089 , United States.

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|August 22, 2019
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Summary
This summary is machine-generated.

Hot electrons from a metal-insulator-semiconductor junction efficiently drive the hydrogen evolution reaction, achieving high quantum efficiencies. This breakthrough utilizes hot electron injection to overcome efficiency limitations in solar fuel conversion.

Keywords:
MIS devicesMonte Carlo simulationhot electronhydrogen evolution reactionquantum efficiencyscattering mechanism

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Nanotechnology

Background:

  • Hot electrons offer potential for driving high-barrier electrochemical reactions and solar fuel conversion.
  • Low conversion efficiency due to high hot electron scattering rates remains a significant challenge.

Purpose of the Study:

  • To investigate efficient modulation of the hydrogen evolution reaction (HER) using hot electrons.
  • To explore the use of metal-insulator-semiconductor (MIS) junctions as hot electron sources for electrochemistry.

Main Methods:

  • Fabrication of an Au-Al2O3-Si MIS junction for injecting hot electrons into a thin gold film.
  • Electrochemical measurements of the HER in acidic solution, with simultaneous current monitoring from solution, gold, and silicon terminals.
  • Theoretical evaluation using electron-electron and electron-phonon scattering simulations to model hot electron behavior.

Main Results:

  • Achieved high quantum efficiencies (∼85%) for hot electron-driven HER with a significant shift in onset potential (∼0.6 V).
  • Decomposed HER rate into thermal electron, hot electron, and direct silicon injection components.
  • Simulations predicted increased electron supply and peaked interface interaction due to hot electron injection.

Conclusions:

  • MIS devices provide a versatile and efficient platform for generating hot electrons to drive electrochemical reactions.
  • Hot electron injection significantly enhances HER efficiency, overcoming scattering limitations.
  • This approach shows promise for efficient solar-to-fuel conversion technologies.