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<p>Engineering an appropriate nanoporous architecture of photoanodes is essential to achieve high photocatalytic activity for water oxidation. Herein, we describe the use of the metal–organic decomposition (MOD) method, a facile and low-cost approach, in conjunction with the doctor blade technique to construct nanoporous BiVO<sub>4</sub> thin films. The effects of calcination temperature, calcination duration and film thickness were investigated. The annealing temperature had a significant impact on the nanostructure, and therefore on the porosity and electrochemically active surface area of BiVO<sub>4</sub> thin films, while the thickness affected the charge transfer resistance. The optimized pristine BiVO<sub>4</sub> photoanode without any modification such as intrinsic doping, an additional catalyst layer, or a passivation layer delivered a photocurrent density of 1.45&#xa0;mA&#xa0;cm<sup>−2</sup> at 1.23&#xa0;V versus RHE under AM 1.5G illumination with a Faradaic efficiency of up to 92%. This performance places it among the most efficient pristine BiVO<sub>4</sub> photoanodes reported to date using the MOD method.</p>

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Optimization of fabrication parameters for pristine BiVO4 photoanodes prepared by the metal–organic decomposition method

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Hoang V. Le,
  • Duc N. Nguyen,
  • Ly T. Le,
  • Phong D. Tran

摘要

Engineering an appropriate nanoporous architecture of photoanodes is essential to achieve high photocatalytic activity for water oxidation. Herein, we describe the use of the metal–organic decomposition (MOD) method, a facile and low-cost approach, in conjunction with the doctor blade technique to construct nanoporous BiVO4 thin films. The effects of calcination temperature, calcination duration and film thickness were investigated. The annealing temperature had a significant impact on the nanostructure, and therefore on the porosity and electrochemically active surface area of BiVO4 thin films, while the thickness affected the charge transfer resistance. The optimized pristine BiVO4 photoanode without any modification such as intrinsic doping, an additional catalyst layer, or a passivation layer delivered a photocurrent density of 1.45 mA cm−2 at 1.23 V versus RHE under AM 1.5G illumination with a Faradaic efficiency of up to 92%. This performance places it among the most efficient pristine BiVO4 photoanodes reported to date using the MOD method.