We present a simple methodology to construct novel Co-Pi decorated TiO₂/Bi₄Ti₃O₁₂ nanorod (TiO₂/BTO@Co-Pi NR) arrays as photoanode for enhanced water splitting. By using successive ionic layer adsorption and reaction (SILAR) method, controllable amounts of BiOI nanoplates were uniformly immobilized on the hydrothermal grown TiO₂ NR arrays on Fluorine-doped tin oxide (FTO) substrate. TiO₂/BTO NR heterojunction was conveniently obtained by partial conversion of TiO₂ to high crystallized Bi₄Ti₃O₁₂ through a solid-state reaction with BiOI nanoplates at high temperature. Afterwards, Co-Pi nanoparticles were deposited on TiO₂/BTO by photoelectrical deposition to generate TiO₂/BTO@Co-Pi composites. Photoelectrochemical (PEC) measurements have demonstrated that the prepared TiO₂/BTO photoanode exhibits extremely enhanced performance than pristine TiO₂ for PEC water splitting thanks to the increased visible light absorption and photogenerated charge separation efficiency. Moreover, both the photocurrent density and incident photo-to-current conversion efficiency (IPCE) were further improved after the decoration of Co-Pi. This work provides a feasible and low-cost strategy to establish TiO₂/Bi₄Ti₃O₁₂ based photoelectrode, therefore, is suitable for practical applications.

我们提出了一种简单的方法来构建新型 Co-Pi 装饰的 TiO ₂ /Bi ₄ Ti ₃ O ₁₂纳米棒（TiO ₂ /BTO@Co-Pi NR）阵列作为用于增强水分解的光阳极。通过使用连续离子层吸附和反应（SILAR）方法，可控量的BiOI纳米片均匀地固定在掺氟氧化锡（FTO）衬底上的水热生长的TiO ₂ NR阵列上。通过将 TiO ₂部分转化为高结晶的 Bi ₄ Ti ₃ O _{12 可以}方便地获得TiO ₂ /BTO NR 异质结通过在高温下与 BiOI 纳米片发生固态反应。然后，通过光电沉积将Co-Pi纳米颗粒沉积在TiO ₂ /BTO上以生成TiO ₂ /BTO@Co-Pi复合材料。光电化学 (PEC) 测量表明，由于可见光吸收和光生电荷分离效率的增加，制备的 TiO ₂ /BTO 光阳极在 PEC 水分解方面表现出比原始 TiO _{2 显}着增强的性能。此外，在 Co-Pi 装饰后，光电流密度和入射光电流转换效率（IPCE）都得到了进一步提高。这项工作为建立TiO ₂ /Bi ₄提供了一种可行且低成本的策略。因此，基于Ti ₃ O ₁₂的光电极适合于实际应用。