Simultaneous Improvement of Absorption and Separation Efficiencies of Mo:BiVO4 Photoanodes via Nanopatterned SnO2/Au Hybrid Layers

Sucheol Ju, Junho Jun, Daihong Huh, Soomin Son, Young Hoon Sung, Jaemin Park, Wonjoong Kim, Seungho Baek, Heon Lee

Research output: Contribution to journalArticle

Abstract

BiVO4 has a thickness limitation because of carrier diffusion length; thus, the light-absorption efficiency is limited. To resolve this issue, we propose coating Mo:BiVO4 on nanopatterned electrodes fabricated via direct-printing technology, which is the most suitable patterning technology for energy-related fields in cases where cost effectiveness is important. We designed two types of nanoelectrodes: nanocone (NC) and reverse NC (RNC). Nanopatterned electrodes mitigate the problems of the short carrier-diffusion length, allowing a larger amount of Mo:BiVO4 to be coated. Also, the Au electrode acts as a back reflector, causing multiple light scattering. The nanopatterned electrode increases the carrier-separation efficiency and the light-absorption efficiency simultaneously owing to the larger amount of Mo:BiVO4 and multiple light scattering. The photocurrent densities of the Au/SnO2/Mo:BiVO4 NC electrode, a corresponding RNC electrode, and a flat electrode were 1.53, 1.35, and 0.44 mA/cm2, respectively, at 1.23 VRHE under 1-sun illumination.

Original languageEnglish
Pages (from-to)17000-17007
Number of pages8
JournalACS Sustainable Chemistry and Engineering
Volume7
Issue number20
DOIs
Publication statusPublished - 2019 Oct 21

Keywords

  • direct printing
  • multi light scattering
  • nanopatterned electrode
  • PEC water splitting
  • resolve short carrier diffusion length

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

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