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<p>Semiconductor-based photoelectrochemical (PEC) technology is regarded as a promising approach for tackling environmental and energy challenges. Bismuth ferrite (BiFeO<sub>3</sub>, BFO) is considered a particularly attractive photocathode material in PEC systems. However, its PEC performance is hindered by inefficient carrier separation and poor charge transfer properties. In this work, a hybrid <i>p</i>-BFO/<i>n</i>-TiO<sub>2</sub> heterojunction photocathode with enhanced PEC performance was developed using a simple method. Experimental results demonstrate that the incorporation of TiO<sub>2</sub> nanomaterials can significantly improve the PEC performance of BFO. The optimized BFT2 heterojunction sample exhibited maximum photocurrent value of −16.4&#xa0;μA cm<sup>−2</sup>, which is 2.65 times that of the pure BFO sample (−6.2 μA&#xa0;cm<sup>−2</sup>). The enhancement in PEC performance is primarily attributed to the formation of a p–n heterojunction between BFO and TiO<sub>2</sub>. The p–n junction possesses an internal electric field with good band alignment at the interfacial region, effectively facilitating the separation and subsequent transfer of charge carriers. Our research provides a promising route for the development of high-performance PEC systems for practical applications.</p>

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Boosting the Solar Energy Conversion Efficiency of Photoelectrochemical Cells via p-BiFeO3/n-TiO2 Heterojunctions

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Xinzhi Qiu,
  • Chao Gong,
  • Miao Huang,
  • Yuanke Liu,
  • Qiming Wang,
  • Lei Zhou,
  • Huanyu Shen,
  • Yi Lin,
  • Feng Nan

摘要

Semiconductor-based photoelectrochemical (PEC) technology is regarded as a promising approach for tackling environmental and energy challenges. Bismuth ferrite (BiFeO3, BFO) is considered a particularly attractive photocathode material in PEC systems. However, its PEC performance is hindered by inefficient carrier separation and poor charge transfer properties. In this work, a hybrid p-BFO/n-TiO2 heterojunction photocathode with enhanced PEC performance was developed using a simple method. Experimental results demonstrate that the incorporation of TiO2 nanomaterials can significantly improve the PEC performance of BFO. The optimized BFT2 heterojunction sample exhibited maximum photocurrent value of −16.4 μA cm−2, which is 2.65 times that of the pure BFO sample (−6.2 μA cm−2). The enhancement in PEC performance is primarily attributed to the formation of a p–n heterojunction between BFO and TiO2. The p–n junction possesses an internal electric field with good band alignment at the interfacial region, effectively facilitating the separation and subsequent transfer of charge carriers. Our research provides a promising route for the development of high-performance PEC systems for practical applications.