Defective TiO2 composite photoanodes with surface-modified Prussian blue for efficient photoelectrochemical water splitting†

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2024-08-26 DOI:10.1039/d4cy00895b

Lipeng Wang , Rui Wang , Longjie Lai , Waqar Younas , Guobing Mao , Li Zhang , Qi Liu

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Abstract

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%.

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表面修饰普鲁士蓝的缺陷二氧化钛复合光阳极用于高效光电化学水分离

太阳能制氢因其高效、环保的特性，在应对能源危机方面备受关注。在这项研究中，我们成功地利用一种简单的电化学还原方法在二氧化钛纳米棒光电负极（称为缺陷二氧化钛（D-TiO2））上引入了氧空位。同时，普鲁士蓝（PB）沉积在 D-TiO2 上，形成了核壳复合光阳极材料。通过优化还原时间，D-TiO2 的电荷分离得到了改善。加入 PB 后，TiO2 和 PB 之间形成了 II 型异质结。异质结的形成扩大了 TiO2 的光吸收范围，增加了活性位点，并由于 PB 的大表面积而减少了光生电荷的重组。与 RHE 相比，D-TiO2@PB 的光电流密度在 1.23 V 时达到 2.10 mA cm-2，IPCE 增强了 35.8%。

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.