Enhancing electrical conductivity is necessary to widen application of hematite (α-Fe₂O₃) as efficient photocatalyst for water oxidation. Doping heteroatoms and developing p-n junction are effective ways for improving carrier density and charge transfer. Heteroatoms of Ti and Mn are doped in hematite to establish p-n homojunction using hydrothermal and annealing processes for catalyzing water oxidation in this work. Ti-doping amount in Ti-doped hematite layer (Ti:Fe₂O₃) and hydrothermal duration for developing Mn-doped hematite layer (Mn:Fe₂O₃) are studied to optimize photoelectrochemical performance of hematite homojunction electrode. Optimized Mn:Fe₂O₃/Ti:Fe₂O₃ electrode prepared using 9 μl Ti precursor in hydrothermal solution and 45 min as hydrothermal time for constructing Mn:Fe₂O₃ shows highest photocurrent density of 2.09 mA/cm² at 1.60 V_RHE, owing to small charge-transfer resistance and high carrier density. This study illustrates importance of designing separated layers for establishing homojunction and provides useful indications for picturing recipe for creating efficient photoanode for catalyzing water oxidation.

增强导电性必须加宽赤铁矿的应用（的α-Fe ₂ ö ₃）作为有效光催化剂用于水氧化。掺杂杂原子和发展pn结是提高载流子密度和电荷转移的有效方法。在这项工作中，使用水热和退火工艺将Ti和Mn的杂原子掺杂在赤铁矿中以建立pn同质结。研究了掺铁赤铁矿层（Ti：Fe ₂ O ₃）中的掺钛量和显影锰掺杂赤铁矿层（Mn：Fe ₂ O ₃）的水热持续时间，以优化赤铁矿同质结电极的光电化学性能。优化的Mn：Fe ₂ O₃ / Ti：Fe ₂ O ₃电极，使用9μlTi前驱体在水热溶液中制备，并以45分钟的水热时间制备Mn：Fe ₂ O ₃，在1.60 V _RHE时显示出最高的光电流密度，为2.09 mA / cm ²，这是因为电荷转移电阻高，载流子密度高。这项研究说明了设计用于建立同质结的分离层的重要性，并为绘制配方以创建有效的光阳极来催化水氧化提供了有用的指示。