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Solution-processed silicon quantum dot photocathode for hydrogen evolution.

Miho Takada1, Kosuke Inoue1, Hiroshi Sugimoto1

  • 1Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, Rokkodai, Nada, Kobe 657-8501, Japan.

Nanotechnology
|June 10, 2021
PubMed
Summary
This summary is machine-generated.

Boron and phosphorus codoped silicon quantum dots (Si QDs) exhibit size-dependent photoelectrochemical properties. Smaller Si QDs show anodic photocurrent, while larger ones display a stable cathodic photocurrent, crucial for photocathode applications.

Keywords:
hydrogen evolutionphotocathodequantum dotsilicon

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Silicon quantum dots (Si QDs) are promising nanomaterials for optoelectronic applications.
  • Surface functionalization is key to achieving stable and efficient photoelectrochemical devices.
  • Codoping offers enhanced properties like oxidation resistance in nanomaterials.

Purpose of the Study:

  • To investigate the photoelectrochemical response of boron (B) and phosphorus (P) codoped Si QDs.
  • To understand the influence of Si QD size on their photoelectrochemical behavior.
  • To explore the potential of these materials as photocathodes.

Main Methods:

  • Fabrication of a photoelectrode using drop-coating of codoped Si QDs (2-11 nm) on an indium tin oxide substrate.
  • Characterization of the photoelectrochemical response under varying QD sizes.
  • Analysis of photocurrent transitions and stability.

Main Results:

  • Codoped Si QDs exhibit good dispersibility in alcohol and water, enabling smooth photoelectrode formation.
  • A transition from anodic to cathodic photocurrent occurs around 4 nm QD diameter.
  • Cathodic photocurrent increases with QD size and demonstrates long-term stability (>3000 s) under intermittent light.

Conclusions:

  • The size of Si QDs critically determines their photoelectrochemical response, enabling tunable anodic or cathodic behavior.
  • Codoping enhances oxidation resistance, facilitating photocathode operation.
  • Codoped Si QDs show potential for stable and efficient photocathode applications in photoelectrochemical systems.