Solar hydrogen production has garnered significant attention in addressing the energy crisis due to its efficient and environmentally friendly nature. In this study, we successfully used a simple electrochemical reduction method to introduce oxygen vacancies on a TiO₂ nanorod photoanode, termed defective TiO₂ (D-TiO₂). Meanwhile, Prussian blue (PB) was deposited on D-TiO₂ to create a core–shell composite photoanode material. By optimizing the reduction time, the charge separation of D-TiO₂ is improved. The addition of PB resulted in the formation of a II-type heterojunction between TiO₂ and PB. The formation of the heterojunction enlarges the light absorption range of TiO₂, increases the active sites, and reduces the recombination of photogenerated charges due to the large surface area of PB. The photocurrent density of D-TiO₂@PB reaches 2.10 mA cm⁻² at 1.23 V vs. RHE, with an enhanced IPCE of 35.8%.

中文翻译：

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具有表面改性普鲁士蓝的有缺陷的 TiO2 复合光阳极，用于高效光电化学水分解


太阳能制氢因其高效和环保的性质而在解决能源危机方面受到了广泛关注。在这项研究中，我们成功地使用一种简单的电化学还原方法在TiO ₂纳米棒光阳极上引入氧空位，称为缺陷TiO ₂ (D-TiO ₂ )。同时，将普鲁士蓝（PB）沉积在D-TiO ₂上以形成核壳复合光阳极材料。通过优化还原时间，改善了D-TiO ₂的电荷分离。 PB的添加导致TiO ₂和PB之间形成II型异质结。异质结的形成扩大了TiO ₂的光吸收范围，增加了活性位点，并且由于PB的大表面积而减少了光生电荷的复合。 D-TiO ₂ @PB的光电流密度在1.23 V vs. RHE下达到2.10 mA cm ^-2 ，IPCE提高了35.8%。