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<p>High-frequency, high-current electric pulse annealing technique was employed to significantly enhance the photoelectrochemical (PEC) performance of TiO<sub>2</sub> nanotube arrays (TNTs). TNTs were fabricated on rolled titanium substrates by anodization, and their surface morphology was tailored by pre-rolling treatment. Samples underwent both conventional furnace annealing and electric pulse annealing. Structural characterization revealed that electric pulse annealing treatment significantly increased the anatase phase content and introduced oxygen vacancies, reducing the bandgap and enhancing light absorption. Electrochemical measurements demonstrated that pulsed-treated samples exhibited a fivefold increase in photocurrent density compared to conventionally annealed samples, attributed to improved charge separation and accelerated carrier transport. Unlike previous studies on TNTs annealing, which primarily utilized muffle furnaces, this work established high-frequency, high-current electric pulse annealing as a nove, rapid processing technique.&#xa0;It achieved superior PEC activity in TNTs through phase and defect engineering, offering a promising strategy for optimizing TiO<sub>2</sub> in applications like solar energy conversion.</p>

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Enhancing photoelectrochemical performance of TiO2 nanotube arrays via electric pulse annealing: a synergistic approach to ordered morphology and defect engineering

  • 期刊论文

  • 发表日期：

    2025年7月27日

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  • Guangyi Xu,
  • Peng Tang,
  • Chunling Xie,
  • Xiufeng Xiao

摘要

High-frequency, high-current electric pulse annealing technique was employed to significantly enhance the photoelectrochemical (PEC) performance of TiO2 nanotube arrays (TNTs). TNTs were fabricated on rolled titanium substrates by anodization, and their surface morphology was tailored by pre-rolling treatment. Samples underwent both conventional furnace annealing and electric pulse annealing. Structural characterization revealed that electric pulse annealing treatment significantly increased the anatase phase content and introduced oxygen vacancies, reducing the bandgap and enhancing light absorption. Electrochemical measurements demonstrated that pulsed-treated samples exhibited a fivefold increase in photocurrent density compared to conventionally annealed samples, attributed to improved charge separation and accelerated carrier transport. Unlike previous studies on TNTs annealing, which primarily utilized muffle furnaces, this work established high-frequency, high-current electric pulse annealing as a nove, rapid processing technique. It achieved superior PEC activity in TNTs through phase and defect engineering, offering a promising strategy for optimizing TiO2 in applications like solar energy conversion.