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Periodic Micropillar-Patterned FTO/BiVO4 with Superior Light Absorption and Separation Efficiency for Efficient PEC

Sucheol Ju1, Hojung Kang1, Junho Jun1

  • 1Anam-ro 145, Sungbuk-Gu, Seoul, 136-701, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|April 17, 2021
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Summary

Researchers developed a novel photoanode using 3D patterned fluorine-doped tin oxide (FTO-MP) and bismuth vanadate (BiVO4). This structure significantly boosts light absorption and electron separation, leading to a 67.8% increase in photocurrent density for enhanced energy conversion.

Keywords:
BiVO 4direct printingmicropillar-structured FTOphotoelectrochemical

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy Technologies

Background:

  • Efficient photoanodes are crucial for solar energy conversion.
  • Bismuth vanadate (BiVO4) is a promising photoelectrode material, but its efficiency is often limited by light absorption and charge carrier dynamics.
  • Structured electrode architectures can enhance photoelectrochemical performance.

Purpose of the Study:

  • To fabricate a high-performance photoanode using a 3D periodic, micropillar-structured fluorine-doped tin oxide (FTO-MP) substrate.
  • To enhance light absorption and charge separation efficiency of BiVO4-based photoanodes.
  • To investigate the potential of patterned FTO substrates for improving solar energy conversion efficiency.

Main Methods:

  • Fabrication of patterned FTO-MP substrates using direct printing and spray pyrolysis.
  • Deposition of BiVO4 onto the FTO-MP substrates via sputtering.
  • Post-deposition V ion heat treatment and characterization of the photoanode performance.

Main Results:

  • The 3D periodic structure of FTO-MP effectively enhanced light scattering and light absorption.
  • The high electron mobility of FTO and the enlarged surface area of FTO-MP improved charge separation efficiency.
  • The micropillar-patterned BiVO4 photoanode achieved a photocurrent density of 2.97 mA cm⁻² at 1.23 VRHE, a 67.8% improvement over flat BiVO4.

Conclusions:

  • The patterned FTO-MP substrate provides a significant enhancement in photoanode performance.
  • The fabrication process using direct printing and spray pyrolysis is inexpensive and simple.
  • This strategy offers a new pathway for improving efficiency in various energy conversion applications.