In this study, by using a facile one-pot hydrothermal method, a Ti₃C₂ MXene derived TiO₂ nanosheets/hematite photoanode with interconnected structures is fabricated via the in-situ chemical etching and exfoliation of bulk Ti₃AlC₂ powder. Compared to the pristine Fe₂O₃ film, the as-obtained Fe₂O₃/TiO₂ photoanode exhibits an increased photocurrent density of 1.72 mA cm⁻² at 1.23 V vs. RHE, and a further improved performance of 2.03 mA cm⁻² at 1.23 V vs. RHE accompanied by a cathodic shift in the onset potential are also achieved after the loading of FeNiOOH cocatalyst. Further characterizations reveal that the enhanced PEC performance of Fe₂O₃/TiO₂ photoanode can be ascribed to the facilitated charge separation and transport as well as the accelerated OER kinetics owing to the decoration of TiO₂ nanosheets and the formation of interconnected structures. This study provides a favorable route for effectively improving the PEC activity of hematite photoanode, and also promotes the application of Ti₃C₂ MXene in solar water splitting.

在这项研究中，通过使用方便的一锅水热法，通过原位化学蚀刻和剥落的Ti ₃ AlC ₂散料，制造了具有互连结构的Ti ₃ C ₂ MXene衍生的TiO ₂纳米片/赤铁矿光阳极。相比于原始的Fe ₂ ö ₃膜中，作为获得的Fe ₂ ö ₃ /二氧化钛₂光电阳极显示出1.72毫安厘米增加的光电流密度^-2 1.23 V，相对于RHE，和2.03毫安厘米的进一步改进的性能^{- 2个}负载FeNiOOH助催化剂后，在1.23 V vs. RHE的条件下，也伴随着起始电位的阴极移动，也实现了该功能。进一步的表征表明，Fe ₂ O ₃ / TiO _2光阳极的增强的PEC性能可以归因于由于TiO ₂纳米片的装饰和互连结构的形成而促进的电荷分离和运输以及加速的OER动力学。该研究为有效提高赤铁矿光阳极的PEC活性提供了一条有利的途径，并促进了Ti ₃ C ₂ MXene在太阳能水分解中的应用。